{"id":"CVE-2026-93053","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nspeakup: keyhelp: guard letter_offsets possible out-of-range indexing\n\nhelp_init() builds letter_offsets[] by using the first byte of each\nfunction name as an index via…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nspeakup: keyhelp: guard letter_offsets possible out-of-range indexing\n\nhelp_init() builds letter_offsets[] by using the first byte of each\nfunction name as an index via…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 < fd339b9ef0accb2c24a5285df842552ebf5eb146","Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 < 900cd6e5ef46bd15153762fb26bb03f874fccc52","Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 < 6b39969c724d39b6062efa354dc2d38442bfd021","Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 < 2e91ab73f9beb659f581e2a6a09f79ace1140905","Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 < d7deb90c4cd086cb111f0ecc9da021218fbde1b0","Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 < 5310334762c3f08f51dc2414344dd47492c07d1d","Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 < ca4489b3e54666a7cac7294e71a3cf64e5e95286","Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 < 6a19ad4d68c95185308cd9e5d169b10a2cf236c8","Linux 2.6.37"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:58.783","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93053","references":[{"url":"https://git.kernel.org/stable/c/2e91ab73f9beb659f581e2a6a09f79ace1140905","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5310334762c3f08f51dc2414344dd47492c07d1d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6a19ad4d68c95185308cd9e5d169b10a2cf236c8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6b39969c724d39b6062efa354dc2d38442bfd021","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/900cd6e5ef46bd15153762fb26bb03f874fccc52","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ca4489b3e54666a7cac7294e71a3cf64e5e95286","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d7deb90c4cd086cb111f0ecc9da021218fbde1b0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fd339b9ef0accb2c24a5285df842552ebf5eb146","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.770Z","epss":0.00176,"epssPercentile":0.07425,"slug":"CVE-2026-93053","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nspeakup: keyhelp: guard letter_offsets possible out-of-range indexing\n\nhelp_init() builds letter_offsets[] by using the first byte of each\nfunction name as an index via `(start & 31) - 1`. If function_names are\noverridden from sysfs (root) with a name starting outside [a–z], the\nindex underflows or exceeds the array, leading to OOB write.\n\nFunction names can be overridden with the following commands as root:\n\n    modprobe speakup_soft\n    echo \"0 _bad\" > /sys/accessibility/speakup/i18n/function_names\n    # then press Insert+2 on /dev/tty\n\nThis fix checks the first letter in help_init(), and if it is not in the\n[a–z] range the function returns an error to the caller. Eventually this\nerror is propagated to drivers/accessibility/speakup/main.c:2217, which\ncauses a bleep sound.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}