CVE-2026-74635

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74635", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.922Z", "datePublished": "2026-08-22T15:32:15.280Z", "dateUpdated": "2026-10-16T19:06:04.057Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:59.420Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: bitblit: bound-check glyph index in bit_cursor()\n\nbit_cursor() fetches the glyph under the cursor with\n\n\tc = scr_readw(vc_pos);\n\tsrc = vc_font.data + ((c & charmask) * w * height);\n\nwhere charmask is 0x1ff when vc_hi_font_mask is set. The screen buffer\nvalue comes directly from scr_readw() and may be larger than the current\nfont's glyph count.\n\nSyzkaller triggers this via vcs_write(). The Call Trace shows\nvcs_write() in vc_screen.c writing an arbitrary 16-bit value with\nwritev() to /dev/vcsa, which vcs_write_buf() in vc_screen.c stores via\nvcs_scr_writew() without checking charcount. The stored value is later\nread in bit_cursor() in bitblit.c.\n\nWhen the font is changed from a font with 512 glyphs to a font with\n256 glyphs, the screen buffer can retain characters with the high\nbit set from the previous mode, which could also produce the same\nout-of-bounds access.\n\n BUG: KASAN: global-out-of-bounds in soft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70\n Read of size 16 at addr ffff800086c57970\n\n Call Trace:\n soft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70\n bit_cursor+0xa90/0x1108 drivers/video/fbdev/core/bitblit.c:365\n fbcon_cursor+0x344/0x498 drivers/video/fbdev/core/fbcon.c:1427\n hide_cursor+0xdc/0x2d0 drivers/tty/vt/vt.c:883\n update_region+0x100/0x18c drivers/tty/vt/vt.c:669\n vcs_write+0x8ec/0xaf0 drivers/tty/vt/vc_screen.c:685\n\nbit_putcs_aligned() and bit_putcs_unaligned() already clamp the glyph\nindex to vc_font.charcount. Apply the same clamp in bit_cursor() after\nextracting the attribute and masking, before indexing fontdata.\n\nThe fix completes the bounds checking started in commit 18c4ef4e765a\n(\"fbdev: bitblit: bound-check glyph index in bit_putcs*\"), which missed\nthe cursor path.\n\nThis change should be safe because the clamp reuses the existing\ncontract from fbcon: charcount is maintained under console_lock in\ncon_font_set() and fbcon_font_set(), and hi_font_mask is cleared when\nswitching from 512 to 256 glyphs. When stale screen data with high bits\nremains after a font switch, or when vcs_write() stores an arbitrary\nvalue, clamping the index to 0 prevents the out-of-bounds read without\nchanging cursor semantics \u2014 the same fallback bit_putcs uses."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local write() to /dev/vcsa (or ioctl on an owned virtual console) to poison the VT screen buffer; the bug is in fbcon cursor rendering, not in any network-facing protocol handler.\nAC:L - Syzkaller reproduces the fault reliably by writing arbitrary screen-buffer values to /dev/vcsa; the attacker fully controls the glyph index and can repeat the trigger on every console refresh without races or victim-specific timing.\nPR:L - Triggering needs only a local account with write access to /dev/vcsa* (typically membership in the tty group) or a session owning the target console for KDFONTOP/font-switch paths; no CAP_SYS_ADMIN or init-namespace root is required.\nUI:N - Once the attacker has the needed local device access, exploitation is fully self-contained and does not require any additional action from another user or administrator.\nS:U - Impact is confined to kernel framebuffer-console memory within the same kernel security domain; it does not cross VM, container, or IOMMU boundaries to affect a separate authority.\nC:H - An out-of-bounds read past the font glyph table copies adjacent kernel memory (global or heap font data) into cursor buffers and framebuffer blit paths, disclosing more than a few bytes per trigger.\nI:H - The out-of-bounds glyph pointer feeds update_attr() and soft_cursor() memcpy paths that copy attacker-influenced kernel memory into kmalloc cursor buffers and framebuffer state, constituting kernel memory corruption with integrity impact.\nA:H - KASAN reports a kernel BUG on the out-of-bounds read in soft_cursor(), and repeated malicious /dev/vcsa writes force console refresh through hide_cursor(), enabling kernel oops/panic and console denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/video/fbdev/core/bitblit.c"], "versions": [{"version": "0998a6cb232674408a03e8561dc15aa266b2f53b", "lessThan": "250159ace2dc53c1bdad267aa8da51b638748700", "status": "affected", "versionType": "git"}, {"version": "db5c9a162d2f42bcc842b76b3d935dcc050a0eec", "lessThan": "46336f476484f36145e5117e72d7b590f47433ee", "status": "affected", "versionType": "git"}, {"version": "c12003bf91fdff381c55ef54fef3e961a5af2545", "lessThan": "bf750cfeacf4e47ac72dadc7f05839696efb8576", "status": "affected", "versionType": "git"}, {"version": "9ba1a7802ca9a2590cef95b253e6526f4364477f", "lessThan": "94134d70abf9273b70499d97d0adc9185ef21091", "status": "affected", "versionType": "git"}, {"version": "901f44227072be60812fe8083e83e1533c04eed1", "lessThan": "c1e7351767dd30fc574395c82121e4c67b882da3", "status": "affected", "versionType": "git"}, {"version": "18c4ef4e765a798b47980555ed665d78b71aeadf", "lessThan": "bc9db0d879c655d5dfd8add32fd60f13e65d132c", "status": "affected", "versionType": "git"}, {"version": "18c4ef4e765a798b47980555ed665d78b71aeadf", "lessThan": "9ea879862e66e354e616028c31b39aa3eb6d35d8", "status": "affected", "versionType": "git"}, {"version": "18c4ef4e765a798b47980555ed665d78b71aeadf", "lessThan": "e033cbf3975a8465f879ebd5989dc35b04423a4d", "status": "affected", "versionType": "git"}, {"version": "a10cede006f9614b465cf25609a8753efbfd45cc", "status": "affected", "versionType": "git"}, {"version": "efaf89a75a29b2d179bf4fe63ca62852e93ad620", "status": "affected", "versionType": "git"}, {"version": "5.10.247", "lessThan": "5.10.265", "status": "affected", "versionType": "semver"}, {"version": "5.15.197", "lessThan": "5.15.216", "status": "affected", "versionType": "semver"}, {"version": "6.1.159", "lessThan": "6.1.183", "status": "affected", "versionType": "semver"}, {"version": "6.6.117", "lessThan": "6.6.152", "status": "affected", "versionType": "semver"}, {"version": "6.12.58", "lessThan": "6.12.104", "status": "affected", "versionType": "semver"}, {"version": "5.4.302", "lessThan": "5.5", "status": "affected", "versionType": "semver"}, {"version": "6.17.8", "lessThan": "6.18", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/video/fbdev/core/bitblit.c"], "versions": [{"version": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.247", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.197", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.159", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.117", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.58", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.302"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/250159ace2dc53c1bdad267aa8da51b638748700"}, {"url": "https://git.kernel.org/stable/c/46336f476484f36145e5117e72d7b590f47433ee"}, {"url": "https://git.kernel.org/stable/c/bf750cfeacf4e47ac72dadc7f05839696efb8576"}, {"url": "https://git.kernel.org/stable/c/94134d70abf9273b70499d97d0adc9185ef21091"}, {"url": "https://git.kernel.org/stable/c/c1e7351767dd30fc574395c82121e4c67b882da3"}, {"url": "https://git.kernel.org/stable/c/bc9db0d879c655d5dfd8add32fd60f13e65d132c"}, {"url": "https://git.kernel.org/stable/c/9ea879862e66e354e616028c31b39aa3eb6d35d8"}, {"url": "https://git.kernel.org/stable/c/e033cbf3975a8465f879ebd5989dc35b04423a4d"}], "title": "fbdev: bitblit: bound-check glyph index in bit_cursor()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74635", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:03:10.782063Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:06:04.057Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74635", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:03:10.782063Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:03:22.776Z"}}], "cna": {"title": "fbdev: bitblit: bound-check glyph index in bit_cursor()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local write() to /dev/vcsa (or ioctl on an owned virtual console) to poison the VT screen buffer; the bug is in fbcon cursor rendering, not in any network-facing protocol handler.\nAC:L - Syzkaller reproduces the fault reliably by writing arbitrary screen-buffer values to /dev/vcsa; the attacker fully controls the glyph index and can repeat the trigger on every console refresh without races or victim-specific timing.\nPR:L - Triggering needs only a local account with write access to /dev/vcsa* (typically membership in the tty group) or a session owning the target console for KDFONTOP/font-switch paths; no CAP_SYS_ADMIN or init-namespace root is required.\nUI:N - Once the attacker has the needed local device access, exploitation is fully self-contained and does not require any additional action from another user or administrator.\nS:U - Impact is confined to kernel framebuffer-console memory within the same kernel security domain; it does not cross VM, container, or IOMMU boundaries to affect a separate authority.\nC:H - An out-of-bounds read past the font glyph table copies adjacent kernel memory (global or heap font data) into cursor buffers and framebuffer blit paths, disclosing more than a few bytes per trigger.\nI:H - The out-of-bounds glyph pointer feeds update_attr() and soft_cursor() memcpy paths that copy attacker-influenced kernel memory into kmalloc cursor buffers and framebuffer state, constituting kernel memory corruption with integrity impact.\nA:H - KASAN reports a kernel BUG on the out-of-bounds read in soft_cursor(), and repeated malicious /dev/vcsa writes force console refresh through hide_cursor(), enabling kernel oops/panic and console denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "0998a6cb232674408a03e8561dc15aa266b2f53b", "lessThan": "250159ace2dc53c1bdad267aa8da51b638748700", "versionType": "git"}, {"status": "affected", "version": "db5c9a162d2f42bcc842b76b3d935dcc050a0eec", "lessThan": "46336f476484f36145e5117e72d7b590f47433ee", "versionType": "git"}, {"status": "affected", "version": "c12003bf91fdff381c55ef54fef3e961a5af2545", "lessThan": "bf750cfeacf4e47ac72dadc7f05839696efb8576", "versionType": "git"}, {"status": "affected", "version": "9ba1a7802ca9a2590cef95b253e6526f4364477f", "lessThan": "94134d70abf9273b70499d97d0adc9185ef21091", "versionType": "git"}, {"status": "affected", "version": "901f44227072be60812fe8083e83e1533c04eed1", "lessThan": "c1e7351767dd30fc574395c82121e4c67b882da3", "versionType": "git"}, {"status": "affected", "version": "18c4ef4e765a798b47980555ed665d78b71aeadf", "lessThan": "bc9db0d879c655d5dfd8add32fd60f13e65d132c", "versionType": "git"}, {"status": "affected", "version": "18c4ef4e765a798b47980555ed665d78b71aeadf", "lessThan": "9ea879862e66e354e616028c31b39aa3eb6d35d8", "versionType": "git"}, {"status": "affected", "version": "18c4ef4e765a798b47980555ed665d78b71aeadf", "lessThan": "e033cbf3975a8465f879ebd5989dc35b04423a4d", "versionType": "git"}, {"status": "affected", "version": "a10cede006f9614b465cf25609a8753efbfd45cc", "versionType": "git"}, {"status": "affected", "version": "efaf89a75a29b2d179bf4fe63ca62852e93ad620", "versionType": "git"}, {"status": "affected", "version": "5.10.247", "lessThan": "5.10.265", "versionType": "semver"}, {"status": "affected", "version": "5.15.197", "lessThan": "5.15.216", "versionType": "semver"}, {"status": "affected", "version": "6.1.159", "lessThan": "6.1.183", "versionType": "semver"}, {"status": "affected", "version": "6.6.117", "lessThan": "6.6.152", "versionType": "semver"}, {"status": "affected", "version": "6.12.58", "lessThan": "6.12.104", "versionType": "semver"}, {"status": "affected", "version": "5.4.302", "lessThan": "5.5", "versionType": "semver"}, {"status": "affected", "version": "6.17.8", "lessThan": "6.18", "versionType": "semver"}], "programFiles": ["drivers/video/fbdev/core/bitblit.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"status": "unaffected", "version": "0", "lessThan": "6.18", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.265", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.152", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.104", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.45", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.9", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/video/fbdev/core/bitblit.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/250159ace2dc53c1bdad267aa8da51b638748700"}, {"url": "https://git.kernel.org/stable/c/46336f476484f36145e5117e72d7b590f47433ee"}, {"url": "https://git.kernel.org/stable/c/bf750cfeacf4e47ac72dadc7f05839696efb8576"}, {"url": "https://git.kernel.org/stable/c/94134d70abf9273b70499d97d0adc9185ef21091"}, {"url": "https://git.kernel.org/stable/c/c1e7351767dd30fc574395c82121e4c67b882da3"}, {"url": "https://git.kernel.org/stable/c/bc9db0d879c655d5dfd8add32fd60f13e65d132c"}, {"url": "https://git.kernel.org/stable/c/9ea879862e66e354e616028c31b39aa3eb6d35d8"}, {"url": "https://git.kernel.org/stable/c/e033cbf3975a8465f879ebd5989dc35b04423a4d"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: bitblit: bound-check glyph index in bit_cursor()\n\nbit_cursor() fetches the glyph under the cursor with\n\n\tc = scr_readw(vc_pos);\n\tsrc = vc_font.data + ((c & charmask) * w * height);\n\nwhere charmask is 0x1ff when vc_hi_font_mask is set. The screen buffer\nvalue comes directly from scr_readw() and may be larger than the current\nfont's glyph count.\n\nSyzkaller triggers this via vcs_write(). The Call Trace shows\nvcs_write() in vc_screen.c writing an arbitrary 16-bit value with\nwritev() to /dev/vcsa, which vcs_write_buf() in vc_screen.c stores via\nvcs_scr_writew() without checking charcount. The stored value is later\nread in bit_cursor() in bitblit.c.\n\nWhen the font is changed from a font with 512 glyphs to a font with\n256 glyphs, the screen buffer can retain characters with the high\nbit set from the previous mode, which could also produce the same\nout-of-bounds access.\n\n BUG: KASAN: global-out-of-bounds in soft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70\n Read of size 16 at addr ffff800086c57970\n\n Call Trace:\n soft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70\n bit_cursor+0xa90/0x1108 drivers/video/fbdev/core/bitblit.c:365\n fbcon_cursor+0x344/0x498 drivers/video/fbdev/core/fbcon.c:1427\n hide_cursor+0xdc/0x2d0 drivers/tty/vt/vt.c:883\n update_region+0x100/0x18c drivers/tty/vt/vt.c:669\n vcs_write+0x8ec/0xaf0 drivers/tty/vt/vc_screen.c:685\n\nbit_putcs_aligned() and bit_putcs_unaligned() already clamp the glyph\nindex to vc_font.charcount. Apply the same clamp in bit_cursor() after\nextracting the attribute and masking, before indexing fontdata.\n\nThe fix completes the bounds checking started in commit 18c4ef4e765a\n(\"fbdev: bitblit: bound-check glyph index in bit_putcs*\"), which missed\nthe cursor path.\n\nThis change should be safe because the clamp reuses the existing\ncontract from fbcon: charcount is maintained under console_lock in\ncon_font_set() and fbcon_font_set(), and hi_font_mask is cleared when\nswitching from 512 to 256 glyphs. When stale screen data with high bits\nremains after a font switch, or when vcs_write() stores an arbitrary\nvalue, clamping the index to 0 prevents the out-of-bounds read without\nchanging cursor semantics \u2014 the same fallback bit_putcs uses."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "5.10.247"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "5.15.197"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "6.1.159"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.152", "versionStartIncluding": "6.6.117"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.104", "versionStartIncluding": "6.12.58"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.45", "versionStartIncluding": "6.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.9", "versionStartIncluding": "6.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.4.302"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.17.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:59.420Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74635", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:06:04.057Z", "dateReserved": "2026-08-15T05:44:03.922Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-22T15:32:15.280Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/video/fbdev/core/bitblit.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "250159ace2dc53c1bdad267aa8da51b638748700", "status": "affected", "version": "0998a6cb232674408a03e8561dc15aa266b2f53b", "versionType": "git"}, {"lessThan": "46336f476484f36145e5117e72d7b590f47433ee", "status": "affected", "version": "db5c9a162d2f42bcc842b76b3d935dcc050a0eec", "versionType": "git"}, {"lessThan": "bf750cfeacf4e47ac72dadc7f05839696efb8576", "status": "affected", "version": "c12003bf91fdff381c55ef54fef3e961a5af2545", "versionType": "git"}, {"lessThan": "94134d70abf9273b70499d97d0adc9185ef21091", "status": "affected", "version": "9ba1a7802ca9a2590cef95b253e6526f4364477f", "versionType": "git"}, {"lessThan": "c1e7351767dd30fc574395c82121e4c67b882da3", "status": "affected", "version": "901f44227072be60812fe8083e83e1533c04eed1", "versionType": "git"}, {"lessThan": "bc9db0d879c655d5dfd8add32fd60f13e65d132c", "status": "affected", "version": "18c4ef4e765a798b47980555ed665d78b71aeadf", "versionType": "git"}, {"lessThan": "9ea879862e66e354e616028c31b39aa3eb6d35d8", "status": "affected", "version": "18c4ef4e765a798b47980555ed665d78b71aeadf", "versionType": "git"}, {"lessThan": "e033cbf3975a8465f879ebd5989dc35b04423a4d", "status": "affected", "version": "18c4ef4e765a798b47980555ed665d78b71aeadf", "versionType": "git"}, {"status": "affected", "version": "a10cede006f9614b465cf25609a8753efbfd45cc", "versionType": "git"}, {"status": "affected", "version": "efaf89a75a29b2d179bf4fe63ca62852e93ad620", "versionType": "git"}, {"lessThan": "5.10.265", "status": "affected", "version": "5.10.247", "versionType": "semver"}, {"lessThan": "5.15.216", "status": "affected", "version": "5.15.197", "versionType": "semver"}, {"lessThan": "6.1.183", "status": "affected", "version": "6.1.159", "versionType": "semver"}, {"lessThan": "6.6.152", "status": "affected", "version": "6.6.117", "versionType": "semver"}, {"lessThan": "6.12.104", "status": "affected", "version": "6.12.58", "versionType": "semver"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.302", "versionType": "semver"}, {"lessThan": "6.18", "status": "affected", "version": "6.17.8", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/video/fbdev/core/bitblit.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"lessThan": "6.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.152", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: bitblit: bound-check glyph index in bit_cursor()\n\nbit_cursor() fetches the glyph under the cursor with\n\n\tc = scr_readw(vc_pos);\n\tsrc = vc_font.data + ((c & charmask) * w * height);\n\nwhere charmask is 0x1ff when vc_hi_font_mask is set. The screen buffer\nvalue comes directly from scr_readw() and may be larger than the current\nfont's glyph count.\n\nSyzkaller triggers this via vcs_write(). The Call Trace shows\nvcs_write() in vc_screen.c writing an arbitrary 16-bit value with\nwritev() to /dev/vcsa, which vcs_write_buf() in vc_screen.c stores via\nvcs_scr_writew() without checking charcount. The stored value is later\nread in bit_cursor() in bitblit.c.\n\nWhen the font is changed from a font with 512 glyphs to a font with\n256 glyphs, the screen buffer can retain characters with the high\nbit set from the previous mode, which could also produce the same\nout-of-bounds access.\n\n BUG: KASAN: global-out-of-bounds in soft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70\n Read of size 16 at addr ffff800086c57970\n\n Call Trace:\n soft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70\n bit_cursor+0xa90/0x1108 drivers/video/fbdev/core/bitblit.c:365\n fbcon_cursor+0x344/0x498 drivers/video/fbdev/core/fbcon.c:1427\n hide_cursor+0xdc/0x2d0 drivers/tty/vt/vt.c:883\n update_region+0x100/0x18c drivers/tty/vt/vt.c:669\n vcs_write+0x8ec/0xaf0 drivers/tty/vt/vc_screen.c:685\n\nbit_putcs_aligned() and bit_putcs_unaligned() already clamp the glyph\nindex to vc_font.charcount. Apply the same clamp in bit_cursor() after\nextracting the attribute and masking, before indexing fontdata.\n\nThe fix completes the bounds checking started in commit 18c4ef4e765a\n(\"fbdev: bitblit: bound-check glyph index in bit_putcs*\"), which missed\nthe cursor path.\n\nThis change should be safe because the clamp reuses the existing\ncontract from fbcon: charcount is maintained under console_lock in\ncon_font_set() and fbcon_font_set(), and hi_font_mask is cleared when\nswitching from 512 to 256 glyphs. When stale screen data with high bits\nremains after a font switch, or when vcs_write() stores an arbitrary\nvalue, clamping the index to 0 prevents the out-of-bounds read without\nchanging cursor semantics \u2014 the same fallback bit_putcs uses."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfbdev: bitblit: comprobaci\u00f3n de l\u00edmites del \u00edndice de glifos en bit_cursor()\n\nbit_cursor() obtiene el glifo bajo el cursor con\n\n\tc = scr_readw(vc_pos);\n\tsrc = vc_font.data + ((c & charmask) * w * height);\n\ndonde charmask es 0x1ff cuando vc_hi_font_mask est\u00e1 establecido. El valor del b\u00fafer de pantalla proviene directamente de scr_readw() y puede ser mayor que el recuento de glifos de la fuente actual.\n\nSyzkaller activa esto a trav\u00e9s de vcs_write(). El Call Trace muestra a vcs_write() en vc_screen.c escribiendo un valor arbitrario de 16 bits con writev() en /dev/vcsa, el cual vcs_write_buf() en vc_screen.c almacena a trav\u00e9s de vcs_scr_writew() sin comprobar charcount. El valor almacenado se lee posteriormente en bit_cursor() en bitblit.c.\n\nCuando la fuente se cambia de una fuente con 512 glifos a una fuente con 256 glifos, el b\u00fafer de pantalla puede retener caracteres con el bit alto establecido del modo anterior, lo que tambi\u00e9n podr\u00eda producir el mismo acceso fuera de l\u00edmites.\n\n BUG: KASAN: global-fuera-de-l\u00edmites en soft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70\n Lectura de tama\u00f1o 16 en la direcci\u00f3n ffff800086c57970\n\n Call Trace:\n soft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70\n bit_cursor+0xa90/0x1108 drivers/video/fbdev/core/bitblit.c:365\n fbcon_cursor+0x344/0x498 drivers/video/fbdev/core/fbcon.c:1427\n hide_cursor+0xdc/0x2d0 drivers/tty/vt/vt.c:883\n update_region+0x100/0x18c drivers/tty/vt/vt.c:669\n vcs_write+0x8ec/0xaf0 drivers/tty/vt/vc_screen.c:685\n\nbit_putcs_aligned() y bit_putcs_unaligned() ya limitan el \u00edndice de glifos a vc_font.charcount. Aplique la misma limitaci\u00f3n en bit_cursor() despu\u00e9s de extraer el atributo y enmascarar, antes de indexar fontdata.\n\nLa correcci\u00f3n completa la comprobaci\u00f3n de l\u00edmites iniciada en el commit 18c4ef4e765a ('fbdev: bitblit: comprobaci\u00f3n de l\u00edmites del \u00edndice de glifos en bit_putcs'), que omiti\u00f3 la ruta del cursor.\n\nEste cambio deber\u00eda ser seguro porque la limitaci\u00f3n reutiliza el contrato existente de fbcon: charcount se mantiene bajo console_lock en con_font_set() y fbcon_font_set(), y hi_font_mask se borra al cambiar de 512 a 256 glifos. Cuando los datos de pantalla obsoletos con bits altos permanecen despu\u00e9s de un cambio de fuente, o cuando vcs_write() almacena un valor arbitrario, limitar el \u00edndice a 0 evita la lectura fuera de l\u00edmites sin cambiar la sem\u00e1ntica del cursor - el mismo mecanismo de reserva que usa bit_putcs."}], "id": "CVE-2026-74635", "lastModified": "2026-10-16T20:17:48.583", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74635", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:03:10.782063Z", "version": "2.0.3"}}]}, "published": "2026-08-22T16:16:36.590", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/250159ace2dc53c1bdad267aa8da51b638748700"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/46336f476484f36145e5117e72d7b590f47433ee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/94134d70abf9273b70499d97d0adc9185ef21091"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9ea879862e66e354e616028c31b39aa3eb6d35d8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bc9db0d879c655d5dfd8add32fd60f13e65d132c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bf750cfeacf4e47ac72dadc7f05839696efb8576"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c1e7351767dd30fc574395c82121e4c67b882da3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e033cbf3975a8465f879ebd5989dc35b04423a4d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: fbdev: bitblit: bound-check glyph index in bit_cursor()", "id": "2521416", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521416"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfbdev: bitblit: bound-check glyph index in bit_cursor()\nbit_cursor() fetches the glyph under the cursor with\nc = scr_readw(vc_pos);\nsrc = vc_font.data + ((c & charmask) * w * height);\nwhere charmask is 0x1ff when vc_hi_font_mask is set. The screen buffer\nvalue comes directly from scr_readw() and may be larger than the current\nfont's glyph count.\nSyzkaller triggers this via vcs_write(). The Call Trace shows\nvcs_write() in vc_screen.c writing an arbitrary 16-bit value with\nwritev() to /dev/vcsa, which vcs_write_buf() in vc_screen.c stores via\nvcs_scr_writew() without checking charcount. The stored value is later\nread in bit_cursor() in bitblit.c.\nWhen the font is changed from a font with 512 glyphs to a font with\n256 glyphs, the screen buffer can retain characters with the high\nbit set from the previous mode, which could also produce the same\nout-of-bounds access.\nBUG: KASAN: global-out-of-bounds in soft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70\nRead of size 16 at addr ffff800086c57970\nCall Trace:\nsoft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70\nbit_cursor+0xa90/0x1108 drivers/video/fbdev/core/bitblit.c:365\nfbcon_cursor+0x344/0x498 drivers/video/fbdev/core/fbcon.c:1427\nhide_cursor+0xdc/0x2d0 drivers/tty/vt/vt.c:883\nupdate_region+0x100/0x18c drivers/tty/vt/vt.c:669\nvcs_write+0x8ec/0xaf0 drivers/tty/vt/vc_screen.c:685\nbit_putcs_aligned() and bit_putcs_unaligned() already clamp the glyph\nindex to vc_font.charcount. Apply the same clamp in bit_cursor() after\nextracting the attribute and masking, before indexing fontdata.\nThe fix completes the bounds checking started in commit 18c4ef4e765a\n(\"fbdev: bitblit: bound-check glyph index in bit_putcs*\"), which missed\nthe cursor path.\nThis change should be safe because the clamp reuses the existing\ncontract from fbcon: charcount is maintained under console_lock in\ncon_font_set() and fbcon_font_set(), and hi_font_mask is cleared when\nswitching from 512 to 256 glyphs. When stale screen data with high bits\nremains after a font switch, or when vcs_write() stores an arbitrary\nvalue, clamping the index to 0 prevents the out-of-bounds read without\nchanging cursor semantics \u2014 the same fallback bit_putcs uses.", "A flaw was found in the Linux kernel's `fbdev` subsystem, specifically within the `bit_cursor()` function. A local user can exploit this vulnerability by writing arbitrary values to the `/dev/vcsa` device or by manipulating font changes. This improper handling of glyph indices can lead to an out-of-bounds read, potentially resulting in information disclosure or a denial of service."], "name": "CVE-2026-74635", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74635\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74635\nhttps://lore.kernel.org/linux-cve-announce/2026082222-CVE-2026-74635-df73@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0998a6cb232674408a03e8561dc15aa266b2f53b,250159ace2dc53c1bdad267aa8da51b638748700)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[db5c9a162d2f42bcc842b76b3d935dcc050a0eec,46336f476484f36145e5117e72d7b590f47433ee)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c12003bf91fdff381c55ef54fef3e961a5af2545,bf750cfeacf4e47ac72dadc7f05839696efb8576)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9ba1a7802ca9a2590cef95b253e6526f4364477f,94134d70abf9273b70499d97d0adc9185ef21091)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[901f44227072be60812fe8083e83e1533c04eed1,c1e7351767dd30fc574395c82121e4c67b882da3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[18c4ef4e765a798b47980555ed665d78b71aeadf,bc9db0d879c655d5dfd8add32fd60f13e65d132c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[18c4ef4e765a798b47980555ed665d78b71aeadf,9ea879862e66e354e616028c31b39aa3eb6d35d8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[18c4ef4e765a798b47980555ed665d78b71aeadf,e033cbf3975a8465f879ebd5989dc35b04423a4d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "a10cede006f9614b465cf25609a8753efbfd45cc"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "efaf89a75a29b2d179bf4fe63ca62852e93ad620"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.10.247,5.10.265)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.197,5.15.216)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.159,6.1.183)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.117,6.6.152)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.58,6.12.104)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.4.302,5.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.17.8,6.18)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.265,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.216,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.183,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.152,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.104,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.45,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.9,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T18:45:04.540051+00:00", "updated": "2026-08-25T14:30:19.033411+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}