CVE-2021-47383

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47383", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T14:58:30.812Z", "datePublished": "2024-05-21T15:03:44.286Z", "dateUpdated": "2026-08-05T08:47:33.469Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:33.469Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: Fix out-of-bound vmalloc access in imageblit\n\nThis issue happens when a userspace program does an ioctl\nFBIOPUT_VSCREENINFO passing the fb_var_screeninfo struct\ncontaining only the fields xres, yres, and bits_per_pixel\nwith values.\n\nIf this struct is the same as the previous ioctl, the\nvc_resize() detects it and doesn't call the resize_screen(),\nleaving the fb_var_screeninfo incomplete. And this leads to\nthe updatescrollmode() calculates a wrong value to\nfbcon_display->vrows, which makes the real_y() return a\nwrong value of y, and that value, eventually, causes\nthe imageblit to access an out-of-bound address value.\n\nTo solve this issue I made the resize_screen() be called\neven if the screen does not need any resizing, so it will\n\"fix and fill\" the fb_var_screeninfo independently."}], "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 - The bug is triggered by a local FBIOPUT_VSCREENINFO ioctl on /dev/fbN that flows through fb_set_var \u2192 fbcon_modechanged \u2192 vc_do_resize \u2192 updatescrollmode \u2192 imageblit; it is not reachable via network or adjacent protocols.\nAC:L - A crafted incomplete fb_var_screeninfo (undersized/zero virtual resolution) deterministically drives negative fbcon_display->vrows and an OOB imageblit write; syzkaller has a reliable C repro with no race or attacker-independent conditions.\nPR:L - do_fb_ioctl/FBIOPUT_VSCREENINFO performs no capability check; access only requires opening /dev/fbN, which seated users, video-group members, and embedded/Android graphics processes commonly have without real root in the init namespace.\nUI:N - The attacker opens the framebuffer device and issues the ioctl directly; fbcon_modechanged calls update_screen on the same path, so no separate victim action is required.\nS:U - Impact is kernel memory corruption and crash within the same host security authority; it does not cross a VM, IOMMU, or other distinct boundary.\nC:H - The defect is kernel memory corruption via a vmalloc out-of-bounds access in imageblit; per guidance, such corruption can be leveraged for information disclosure and is scored High when uncertain.\nI:H - Syzbot confirms a KASAN vmalloc-out-of-bounds Write in fast_imageblit/sys_imageblit past screen_base; out-of-bounds writes are scored High because they enable memory corruption and potential control-flow hijacking.\nA:H - The out-of-bounds kernel write can oops/panic the kernel (and does under KASAN), which is a high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tty/vt/vt.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7e71fcedfda6f7de18f850a6b36e78d78b04476f", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "70aed03b1d5a5df974f456cdc8eedb213c94bb8b", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "067c694d06040db6f0c65281bb358452ca6d85b9", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "8a6a240f52e14356386030d8958ae8b1761d2325", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "883f7897a25e3ce14a7f274ca4c73f49ac84002a", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d570c48dd37dbe8fc6875d4461d01a9554ae2560", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "699d926585daa6ec44be556cdc1ab89e5d54557b", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "3b0c406124719b625b1aba431659f5cdc24a982c", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tty/vt/vt.c"], "versions": [{"version": "2.6.12", "status": "affected"}, {"version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver"}, {"version": "4.4.286", "lessThanOrEqual": "4.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.9.285", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.14.249", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.209", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.151", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.71", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.10", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15", "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": "2.6.12", "versionEndExcluding": "4.4.286"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "4.9.285"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "4.14.249"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "4.19.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.4.151"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.71"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.14.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7e71fcedfda6f7de18f850a6b36e78d78b04476f"}, {"url": "https://git.kernel.org/stable/c/70aed03b1d5a5df974f456cdc8eedb213c94bb8b"}, {"url": "https://git.kernel.org/stable/c/067c694d06040db6f0c65281bb358452ca6d85b9"}, {"url": "https://git.kernel.org/stable/c/8a6a240f52e14356386030d8958ae8b1761d2325"}, {"url": "https://git.kernel.org/stable/c/883f7897a25e3ce14a7f274ca4c73f49ac84002a"}, {"url": "https://git.kernel.org/stable/c/d570c48dd37dbe8fc6875d4461d01a9554ae2560"}, {"url": "https://git.kernel.org/stable/c/699d926585daa6ec44be556cdc1ab89e5d54557b"}, {"url": "https://git.kernel.org/stable/c/3b0c406124719b625b1aba431659f5cdc24a982c"}], "title": "tty: Fix out-of-bound vmalloc access in imageblit", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-17T17:37:20.634635Z", "id": "CVE-2021-47383", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-17T17:38:08.205Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.468Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/7e71fcedfda6f7de18f850a6b36e78d78b04476f", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/70aed03b1d5a5df974f456cdc8eedb213c94bb8b", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/067c694d06040db6f0c65281bb358452ca6d85b9", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/8a6a240f52e14356386030d8958ae8b1761d2325", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/883f7897a25e3ce14a7f274ca4c73f49ac84002a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/d570c48dd37dbe8fc6875d4461d01a9554ae2560", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/699d926585daa6ec44be556cdc1ab89e5d54557b", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/3b0c406124719b625b1aba431659f5cdc24a982c", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/7e71fcedfda6f7de18f850a6b36e78d78b04476f", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/70aed03b1d5a5df974f456cdc8eedb213c94bb8b", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/067c694d06040db6f0c65281bb358452ca6d85b9", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/8a6a240f52e14356386030d8958ae8b1761d2325", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/883f7897a25e3ce14a7f274ca4c73f49ac84002a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/d570c48dd37dbe8fc6875d4461d01a9554ae2560", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/699d926585daa6ec44be556cdc1ab89e5d54557b", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/3b0c406124719b625b1aba431659f5cdc24a982c", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.468Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47383", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-06-17T17:37:20.634635Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-17T17:37:21.602Z"}}], "cna": {"title": "tty: Fix out-of-bound vmalloc access in imageblit", "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 - The bug is triggered by a local FBIOPUT_VSCREENINFO ioctl on /dev/fbN that flows through fb_set_var \u2192 fbcon_modechanged \u2192 vc_do_resize \u2192 updatescrollmode \u2192 imageblit; it is not reachable via network or adjacent protocols.\nAC:L - A crafted incomplete fb_var_screeninfo (undersized/zero virtual resolution) deterministically drives negative fbcon_display->vrows and an OOB imageblit write; syzkaller has a reliable C repro with no race or attacker-independent conditions.\nPR:L - do_fb_ioctl/FBIOPUT_VSCREENINFO performs no capability check; access only requires opening /dev/fbN, which seated users, video-group members, and embedded/Android graphics processes commonly have without real root in the init namespace.\nUI:N - The attacker opens the framebuffer device and issues the ioctl directly; fbcon_modechanged calls update_screen on the same path, so no separate victim action is required.\nS:U - Impact is kernel memory corruption and crash within the same host security authority; it does not cross a VM, IOMMU, or other distinct boundary.\nC:H - The defect is kernel memory corruption via a vmalloc out-of-bounds access in imageblit; per guidance, such corruption can be leveraged for information disclosure and is scored High when uncertain.\nI:H - Syzbot confirms a KASAN vmalloc-out-of-bounds Write in fast_imageblit/sys_imageblit past screen_base; out-of-bounds writes are scored High because they enable memory corruption and potential control-flow hijacking.\nA:H - The out-of-bounds kernel write can oops/panic the kernel (and does under KASAN), which is a high availability impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7e71fcedfda6f7de18f850a6b36e78d78b04476f", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "70aed03b1d5a5df974f456cdc8eedb213c94bb8b", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "067c694d06040db6f0c65281bb358452ca6d85b9", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "8a6a240f52e14356386030d8958ae8b1761d2325", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "883f7897a25e3ce14a7f274ca4c73f49ac84002a", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d570c48dd37dbe8fc6875d4461d01a9554ae2560", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "699d926585daa6ec44be556cdc1ab89e5d54557b", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "3b0c406124719b625b1aba431659f5cdc24a982c", "versionType": "git"}], "programFiles": ["drivers/tty/vt/vt.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.12", "versionType": "semver"}, {"status": "unaffected", "version": "4.4.286", "versionType": "semver", "lessThanOrEqual": "4.4.*"}, {"status": "unaffected", "version": "4.9.285", "versionType": "semver", "lessThanOrEqual": "4.9.*"}, {"status": "unaffected", "version": "4.14.249", "versionType": "semver", "lessThanOrEqual": "4.14.*"}, {"status": "unaffected", "version": "4.19.209", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.151", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.71", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.14.10", "versionType": "semver", "lessThanOrEqual": "5.14.*"}, {"status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/tty/vt/vt.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/7e71fcedfda6f7de18f850a6b36e78d78b04476f"}, {"url": "https://git.kernel.org/stable/c/70aed03b1d5a5df974f456cdc8eedb213c94bb8b"}, {"url": "https://git.kernel.org/stable/c/067c694d06040db6f0c65281bb358452ca6d85b9"}, {"url": "https://git.kernel.org/stable/c/8a6a240f52e14356386030d8958ae8b1761d2325"}, {"url": "https://git.kernel.org/stable/c/883f7897a25e3ce14a7f274ca4c73f49ac84002a"}, {"url": "https://git.kernel.org/stable/c/d570c48dd37dbe8fc6875d4461d01a9554ae2560"}, {"url": "https://git.kernel.org/stable/c/699d926585daa6ec44be556cdc1ab89e5d54557b"}, {"url": "https://git.kernel.org/stable/c/3b0c406124719b625b1aba431659f5cdc24a982c"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: Fix out-of-bound vmalloc access in imageblit\n\nThis issue happens when a userspace program does an ioctl\nFBIOPUT_VSCREENINFO passing the fb_var_screeninfo struct\ncontaining only the fields xres, yres, and bits_per_pixel\nwith values.\n\nIf this struct is the same as the previous ioctl, the\nvc_resize() detects it and doesn't call the resize_screen(),\nleaving the fb_var_screeninfo incomplete. And this leads to\nthe updatescrollmode() calculates a wrong value to\nfbcon_display->vrows, which makes the real_y() return a\nwrong value of y, and that value, eventually, causes\nthe imageblit to access an out-of-bound address value.\n\nTo solve this issue I made the resize_screen() be called\neven if the screen does not need any resizing, so it will\n\"fix and fill\" the fb_var_screeninfo independently."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.4.286", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.9.285", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.14.249", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.209", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.151", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.71", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14.10", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15", "versionStartIncluding": "2.6.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:33.469Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47383", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:47:33.469Z", "dateReserved": "2024-05-21T14:58:30.812Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T15:03:44.286Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/tty/vt/vt.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7e71fcedfda6f7de18f850a6b36e78d78b04476f", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "70aed03b1d5a5df974f456cdc8eedb213c94bb8b", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "067c694d06040db6f0c65281bb358452ca6d85b9", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "8a6a240f52e14356386030d8958ae8b1761d2325", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "883f7897a25e3ce14a7f274ca4c73f49ac84002a", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "d570c48dd37dbe8fc6875d4461d01a9554ae2560", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "699d926585daa6ec44be556cdc1ab89e5d54557b", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "3b0c406124719b625b1aba431659f5cdc24a982c", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/tty/vt/vt.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"lessThan": "2.6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "4.4.*", "status": "unaffected", "version": "4.4.286", "versionType": "semver"}, {"lessThanOrEqual": "4.9.*", "status": "unaffected", "version": "4.9.285", "versionType": "semver"}, {"lessThanOrEqual": "4.14.*", "status": "unaffected", "version": "4.14.249", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.209", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.151", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.71", "versionType": "semver"}, {"lessThanOrEqual": "5.14.*", "status": "unaffected", "version": "5.14.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B91CAABE-0800-43BE-9D5D-D95C8E6C367B", "versionEndExcluding": "4.4.286", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "531DC051-E22F-4355-A06F-BE9AF2124AA3", "versionEndExcluding": "4.9.285", "versionStartIncluding": "4.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9DFC8239-9F26-43B2-A340-8EFC6BC6BDA8", "versionEndExcluding": "4.14.249", "versionStartIncluding": "4.10", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "21C23429-F802-4256-B3C2-9EEA76AC11FF", "versionEndExcluding": "4.19.209", "versionStartIncluding": "4.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BFFC8E38-107A-4B6F-9FFD-9B2FD8B89EF0", "versionEndExcluding": "5.4.151", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "60C740E4-6C54-40CD-A914-2232D8FC781D", "versionEndExcluding": "5.10.71", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1A437B0D-8305-4C72-B691-D26986A126CF", "versionEndExcluding": "5.14.10", "versionStartIncluding": "5.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: Fix out-of-bound vmalloc access in imageblit\n\nThis issue happens when a userspace program does an ioctl\nFBIOPUT_VSCREENINFO passing the fb_var_screeninfo struct\ncontaining only the fields xres, yres, and bits_per_pixel\nwith values.\n\nIf this struct is the same as the previous ioctl, the\nvc_resize() detects it and doesn't call the resize_screen(),\nleaving the fb_var_screeninfo incomplete. And this leads to\nthe updatescrollmode() calculates a wrong value to\nfbcon_display->vrows, which makes the real_y() return a\nwrong value of y, and that value, eventually, causes\nthe imageblit to access an out-of-bound address value.\n\nTo solve this issue I made the resize_screen() be called\neven if the screen does not need any resizing, so it will\n\"fix and fill\" the fb_var_screeninfo independently."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: tty: corrige el acceso vmalloc fuera de los l\u00edmites en imageblit. Este problema ocurre cuando un programa de espacio de usuario realiza un ioctl FBIOPUT_VSCREENINFO pasando la estructura fb_var_screeninfo que contiene solo los campos xres, yres y bits_per_pixel con valores. Si esta estructura es la misma que la ioctl anterior, vc_resize() la detecta y no llama a resize_screen(), dejando fb_var_screeninfo incompleto. Y esto lleva a que updatecrollmode() calcule un valor incorrecto para fbcon_display->vrows, lo que hace que real_y() devuelva un valor incorrecto de y, y ese valor, eventualmente, hace que imageblit acceda a un valor de direcci\u00f3n fuera de los l\u00edmites. . Para resolver este problema, hice que se llamara a resize_screen() incluso si la pantalla no necesita ning\u00fan cambio de tama\u00f1o, por lo que \"arreglar\u00e1 y completar\u00e1\" fb_var_screeninfo de forma independiente."}], "id": "CVE-2021-47383", "lastModified": "2026-08-04T10:17:00.893", "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"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47383", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-17T17:37:20.634635Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:23.873", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/067c694d06040db6f0c65281bb358452ca6d85b9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3b0c406124719b625b1aba431659f5cdc24a982c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/699d926585daa6ec44be556cdc1ab89e5d54557b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70aed03b1d5a5df974f456cdc8eedb213c94bb8b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7e71fcedfda6f7de18f850a6b36e78d78b04476f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/883f7897a25e3ce14a7f274ca4c73f49ac84002a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8a6a240f52e14356386030d8958ae8b1761d2325"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d570c48dd37dbe8fc6875d4461d01a9554ae2560"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/067c694d06040db6f0c65281bb358452ca6d85b9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3b0c406124719b625b1aba431659f5cdc24a982c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/699d926585daa6ec44be556cdc1ab89e5d54557b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70aed03b1d5a5df974f456cdc8eedb213c94bb8b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7e71fcedfda6f7de18f850a6b36e78d78b04476f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/883f7897a25e3ce14a7f274ca4c73f49ac84002a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8a6a240f52e14356386030d8958ae8b1761d2325"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d570c48dd37dbe8fc6875d4461d01a9554ae2560"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:7001", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.22.1.rt7.363.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:7000", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.22.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:8617", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.42.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-10-30T00:00:00Z"}, {"advisory": "RHSA-2024:8617", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.42.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-10-30T00:00:00Z"}, {"advisory": "RHSA-2024:5364", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.79.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-08-14T00:00:00Z"}, {"advisory": "RHSA-2024:5365", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.79.1.rt14.364.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-08-14T00:00:00Z"}], "bugzilla": {"description": "kernel: tty: Fix out-of-bound vmalloc access in imageblit", "id": "2282357", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282357"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H", "status": "verified"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntty: Fix out-of-bound vmalloc access in imageblit\nThis issue happens when a userspace program does an ioctl\nFBIOPUT_VSCREENINFO passing the fb_var_screeninfo struct\ncontaining only the fields xres, yres, and bits_per_pixel\nwith values.\nIf this struct is the same as the previous ioctl, the\nvc_resize() detects it and doesn't call the resize_screen(),\nleaving the fb_var_screeninfo incomplete. And this leads to\nthe updatescrollmode() calculates a wrong value to\nfbcon_display->vrows, which makes the real_y() return a\nwrong value of y, and that value, eventually, causes\nthe imageblit to access an out-of-bound address value.\nTo solve this issue I made the resize_screen() be called\neven if the screen does not need any resizing, so it will\n\"fix and fill\" the fb_var_screeninfo independently."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47383", "package_state": [{"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47383\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47383\nhttps://lore.kernel.org/linux-cve-announce/2024052144-CVE-2021-47383-a8f4@gregkh/T"], "statement": "This vulnerability is rated as a moderate severity because it can lead to system crashes by accessing invalid memory addresses, it does not pose a direct threat to data security or allow unauthorized access.", "threat_severity": "Moderate"}

{}