CVE-2024-26994

{"dataType": "CVE_RECORD", "cveMetadata": {"cveId": "CVE-2024-26994", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.206Z", "datePublished": "2024-05-01T05:28:07.350Z", "dateUpdated": "2026-08-05T11:28:53.774Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:28:53.774Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspeakup: Avoid crash on very long word\n\nIn case a console is set up really large and contains a really long word\n(> 256 characters), we have to stop before the length of the word buffer."}], "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 overflow is reached only through the speakup console screen-reader command path (`keyboard_notifier_call` \u2192 `speakup_key` \u2192 `do_spkup` \u2192 `get_word`) combined with `VT_RESIZE`/`PIO_UNIMAP`/`KDFONTOP` ioctls on the attacker's own virtual console, all of which require a local session on the machine. There is no network or remote protocol handler involved, but console/VT access is standard local access rather than physical device attachment.\nAC:L - Every precondition is under the attacker's control: `vt_ioctl()` grants `perm=1` to the tty owner, so an unprivileged console user can `VT_RESIZE` the console past 257 columns (up to `VC_MAXCOL`=32767 outright when the VC is bound to dummycon, which has no `con_resize` clamp, or via a narrow `KDFONTOP` font under fbcon), then print a >256-character word and press the say-word key. No race, no memory-layout luck, and on 4K framebuffer consoles the stock 8x16 font already yields 480 columns by default.\nPR:L - The attacker needs an ordinary unprivileged local account owning a virtual console \u2014 `current->signal->tty == tty` alone satisfies the VT ioctl permission check, so no CAP_SYS_TTY_CONFIG or root is required, and `do_spkup()` performs no capability check before invoking `get_word()`.\nUI:N - The attacker performs every step themselves \u2014 resizing their own VT, loading the unimap, painting the long word, and issuing the speakup say-word/spell-word command; no separate victim needs to be induced into any action.\nS:U - The out-of-bounds write corrupts kernel `.bss` belonging to the same kernel security authority that contains the vulnerable code; no VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The linear overflow lands on `spk_characters[256]`, a pointer array immediately following `buf` in `.bss`, whose entries are dereferenced and printed via `synth_printf(\"%s\", cp)` into the synth buffer that userspace reads from `/dev/softsynth` \u2014 giving an arbitrary kernel-memory read primitive disclosed to the attacker, well beyond a bounded leak.\nI:H - This is an out-of-bounds write of fully attacker-chosen 16-bit values (sourced from an attacker-loaded `inverse_trans_unicode` table) with attacker-chosen length, overwriting adjacent `.bss` pointer arrays such as `spk_our_keys[]` and `speakup_console[]`, the latter being dereferenced for writes (`speakup_console[vc_num]->ht.highbuf[bi][hi] = ic[i]`) \u2014 an arbitrary-write and control-flow-influence primitive.\nA:H - Even without careful exploitation, smashing kilobytes of `.bss` past `buf[256]` corrupts live pointer arrays that speakup dereferences on the next key event, producing an immediate kernel oops/panic \u2014 the crash the commit title explicitly refers to."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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"https://git.kernel.org/stable/c/8f6b62125befe1675446923e4171eac2c012959c"}, {"url": "https://git.kernel.org/stable/c/6401038acfa24cba9c28cce410b7505efadd0222"}, {"url": "https://git.kernel.org/stable/c/0d130158db29f5e0b3893154908cf618896450a8"}, {"url": "https://git.kernel.org/stable/c/89af25bd4b4bf6a71295f07e07a8ae7dc03c6595"}, {"url": "https://git.kernel.org/stable/c/8defb1d22ba0395b81feb963b96e252b097ba76f"}, {"url": "https://git.kernel.org/stable/c/0efb15c14c493263cb3a5f65f5ddfd4603d19a76"}, {"url": "https://git.kernel.org/stable/c/c8d2f34ea96ea3bce6ba2535f867f0d4ee3b22e1"}], "title": "speakup: Avoid crash on very long word", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": 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There is no network or remote protocol handler involved, but console/VT access is standard local access rather than physical device attachment.\nAC:L - Every precondition is under the attacker's control: `vt_ioctl()` grants `perm=1` to the tty owner, so an unprivileged console user can `VT_RESIZE` the console past 257 columns (up to `VC_MAXCOL`=32767 outright when the VC is bound to dummycon, which has no `con_resize` clamp, or via a narrow `KDFONTOP` font under fbcon), then print a >256-character word and press the say-word key. No race, no memory-layout luck, and on 4K framebuffer consoles the stock 8x16 font already yields 480 columns by default.\nPR:L - The attacker needs an ordinary unprivileged local account owning a virtual console \u2014 `current->signal->tty == tty` alone satisfies the VT ioctl permission check, so no CAP_SYS_TTY_CONFIG or root is required, and `do_spkup()` performs no capability check before invoking `get_word()`.\nUI:N - The attacker performs every step themselves \u2014 resizing their own VT, loading the unimap, painting the long word, and issuing the speakup say-word/spell-word command; no separate victim needs to be induced into any action.\nS:U - The out-of-bounds write corrupts kernel `.bss` belonging to the same kernel security authority that contains the vulnerable code; no VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The linear overflow lands on `spk_characters[256]`, a pointer array immediately following `buf` in `.bss`, whose entries are dereferenced and printed via `synth_printf(\"%s\", cp)` into the synth buffer that userspace reads from `/dev/softsynth` \u2014 giving an arbitrary kernel-memory read primitive disclosed to the attacker, well beyond a bounded leak.\nI:H - This is an out-of-bounds write of fully attacker-chosen 16-bit values (sourced from an attacker-loaded `inverse_trans_unicode` table) with attacker-chosen length, overwriting adjacent `.bss` pointer arrays such as `spk_our_keys[]` and `speakup_console[]`, the latter being dereferenced for writes (`speakup_console[vc_num]->ht.highbuf[bi][hi] = ic[i]`) \u2014 an arbitrary-write and control-flow-influence primitive.\nA:H - Even without careful exploitation, smashing kilobytes of `.bss` past `buf[256]` corrupts live pointer arrays that speakup dereferences on the next key event, producing an immediate kernel oops/panic \u2014 the crash the commit title explicitly refers to."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42", "lessThan": "756c5cb7c09e537b87b5d3acafcb101b2ccf394f", "versionType": "git"}, {"status": "affected", "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42", "lessThan": "8f6b62125befe1675446923e4171eac2c012959c", "versionType": "git"}, {"status": "affected", "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42", "lessThan": "6401038acfa24cba9c28cce410b7505efadd0222", "versionType": "git"}, {"status": "affected", "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42", "lessThan": "0d130158db29f5e0b3893154908cf618896450a8", "versionType": "git"}, {"status": "affected", "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42", "lessThan": "89af25bd4b4bf6a71295f07e07a8ae7dc03c6595", "versionType": "git"}, {"status": "affected", "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42", "lessThan": "8defb1d22ba0395b81feb963b96e252b097ba76f", "versionType": "git"}, {"status": "affected", "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42", "lessThan": "0efb15c14c493263cb3a5f65f5ddfd4603d19a76", "versionType": "git"}, {"status": "affected", "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42", "lessThan": "c8d2f34ea96ea3bce6ba2535f867f0d4ee3b22e1", "versionType": "git"}], "programFiles": ["drivers/accessibility/speakup/main.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.37"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.37", "versionType": "semver"}, {"status": "unaffected", "version": "4.19.313", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.275", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.216", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", 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