{ "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", 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"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/stable/c/504178fb7d9f6cdb0496d5491efb05f45597e535" }, { "url": "https://git.kernel.org/stable/c/3726f75a1ccc16cd335c0ccfad1d92ee08ecba5e" }, { "url": "https://git.kernel.org/stable/c/c6e1650cf5df1bd6638eeee231a683ef30c7d4eb" }, { "url": "https://git.kernel.org/stable/c/eb1ea64328d4cc7d7a912c563f8523d5259716ef" }, { "url": "https://git.kernel.org/stable/c/d52c04474feac8e305814a5228e622afe481b2ef" }, { "url": "https://git.kernel.org/stable/c/008ab3c53bc4f0b2f20013c8f6c204a3203d0b8b" } ], "title": "speakup: Fix sizeof() vs ARRAY_SIZE() bug", "x_generator": { 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