{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-38587","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-06-18T19:36:34.929Z","datePublished":"2024-06-19T13:37:42.537Z","dateUpdated":"2026-08-05T11:33:00.055Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:33:00.055Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nspeakup: Fix sizeof() vs ARRAY_SIZE() bug\n\nThe \"buf\" pointer is an array of u16 values.  This code should be\nusing ARRAY_SIZE() (which is 256) instead of sizeof() (which is 512),\notherwise it can the still got out of bounds."}],"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 vulnerable path is reached only through the local virtual console — writing screen content to an owned VC, resizing it via VT_RESIZE, and a speakup KT_SPKUP keypress delivered through the keyboard notifier; there is no network or remote-peer input involved. CVSS 3.1 AV:L covers attacks performed by a local user of the system, including those relying on a console-local action.\nAC:L - Every precondition is under the attacker's control: the tty owner can set vc_cols>257 himself via VT_RESIZE (vgacon accepts any from_user width fitting VRAM), write the ≥257-character word with echo, place the reading cursor, and press the say-word key — a deterministic, repeatable overflow with no race and no memory-layout guessing.\nPR:L - Only an unprivileged local account with a virtual-console session is needed; VT_RESIZE and PIO_UNIMAP are granted to the tty owner without CAP_SYS_TTY_CONFIG (drivers/tty/vt/vt_ioctl.c:740), and writing to one's own /dev/ttyN requires no capability.\nUI:N - The attacker performs every step in his own console session — resize, print the long word, press the speakup key — so no second user has to be tricked into any action.\nS:U - The out-of-bounds write corrupts kernel .bss belonging to the speakup module, staying entirely within the kernel's own security authority with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Overwriting adjacent pointer globals such as spk_characters[], spk_our_keys[], or the i18n message pointers with attacker-chosen 64-bit values turns speakup into an arbitrary kernel-memory read whose output is spoken out and readable from /dev/softsynth; the companion OOB read in spkup_write(buf, 512) also exposes adjacent kernel data.\nI:H - This is a 512-byte out-of-bounds write of fully attacker-chosen u16 values (arbitrary Unicode via a custom unimap) into a cluster of kernel pointers, including the spk_special_handler function pointer that is invoked directly on the next keypress — a direct control-flow hijack and arbitrary-write primitive.\nA:H - Corrupting neighbouring pointers such as tty, speakup_task, or speakup_console[] with garbage reliably produces an oops or panic even without a weaponized exploit, and the write can be repeated at will."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/accessibility/speakup/main.c"],"versions":[{"version":"756c5cb7c09e537b87b5d3acafcb101b2ccf394f","lessThan":"42f0a3f67158ed6b2908d2b9ffbf7e96d23fd358","status":"affected","versionType":"git"},{"version":"8f6b62125befe1675446923e4171eac2c012959c","lessThan":"cd7f3978c2ec741aedd1d860b2adb227314cf996","status":"affected","versionType":"git"},{"version":"6401038acfa24cba9c28cce410b7505efadd0222","lessThan":"07ef95cc7a579731198c93beed281e3a79a0e586","status":"affected","versionType":"git"},{"version":"0d130158db29f5e0b3893154908cf618896450a8","lessThan":"504178fb7d9f6cdb0496d5491efb05f45597e535","status":"affected","versionType":"git"},{"version":"89af25bd4b4bf6a71295f07e07a8ae7dc03c6595","lessThan":"3726f75a1ccc16cd335c0ccfad1d92ee08ecba5e","status":"affected","versionType":"git"},{"version":"8defb1d22ba0395b81feb963b96e252b097ba76f","lessThan":"c6e1650cf5df1bd6638eeee231a683ef30c7d4eb","status":"affected","versionType":"git"},{"version":"0efb15c14c493263cb3a5f65f5ddfd4603d19a76","lessThan":"eb1ea64328d4cc7d7a912c563f8523d5259716ef","status":"affected","versionType":"git"},{"version":"c8d2f34ea96ea3bce6ba2535f867f0d4ee3b22e1","lessThan":"d52c04474feac8e305814a5228e622afe481b2ef","status":"affected","versionType":"git"},{"version":"c8d2f34ea96ea3bce6ba2535f867f0d4ee3b22e1","lessThan":"008ab3c53bc4f0b2f20013c8f6c204a3203d0b8b","status":"affected","versionType":"git"},{"version":"4.19.313","lessThan":"4.19.316","status":"affected","versionType":"semver"},{"version":"5.4.275","lessThan":"5.4.278","status":"affected","versionType":"semver"},{"version":"5.10.216","lessThan":"5.10.219","status":"affected","versionType":"semver"},{"version":"5.15.157","lessThan":"5.15.161","status":"affected","versionType":"semver"},{"version":"6.1.88","lessThan":"6.1.93","status":"affected","versionType":"semver"},{"version":"6.6.29","lessThan":"6.6.33","status":"affected","versionType":"semver"},{"version":"6.8.8","lessThan":"6.8.12","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/accessibility/speakup/main.c"],"versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"4.19.316","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.278","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.219","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.161","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.93","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.33","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.8.12","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9.3","lessThanOrEqual":"6.9.*","status":"unaffected","versionType":"semver"},{"version":"6.10","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":"4.19.313","versionEndExcluding":"4.19.316"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.275","versionEndExcluding":"5.4.278"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.216","versionEndExcluding":"5.10.219"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.157","versionEndExcluding":"5.15.161"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.88","versionEndExcluding":"6.1.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.29","versionEndExcluding":"6.6.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8.8","versionEndExcluding":"6.8.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.9.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.10"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/42f0a3f67158ed6b2908d2b9ffbf7e96d23fd358"},{"url":"https://git.kernel.org/stable/c/cd7f3978c2ec741aedd1d860b2adb227314cf996"},{"url":"https://git.kernel.org/stable/c/07ef95cc7a579731198c93beed281e3a79a0e586"},{"url":"https://git.kernel.org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