{"id":"CVE-2026-93053","summary":"speakup: keyhelp: guard letter_offsets possible out-of-range indexing","details":"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 `(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\" \u003e /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.","modified":"2026-09-19T03:47:30.936743167Z","published":"2026-09-17T16:10:42.397Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93053.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2e91ab73f9beb659f581e2a6a09f79ace1140905"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5310334762c3f08f51dc2414344dd47492c07d1d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6a19ad4d68c95185308cd9e5d169b10a2cf236c8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6b39969c724d39b6062efa354dc2d38442bfd021"},{"type":"WEB","url":"https://git.kernel.org/stable/c/900cd6e5ef46bd15153762fb26bb03f874fccc52"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ca4489b3e54666a7cac7294e71a3cf64e5e95286"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d7deb90c4cd086cb111f0ecc9da021218fbde1b0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fd339b9ef0accb2c24a5285df842552ebf5eb146"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93053.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93053"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c6e3fd22cd538365bfeb82997d5b89562e077d42"},{"fixed":"fd339b9ef0accb2c24a5285df842552ebf5eb146"},{"fixed":"900cd6e5ef46bd15153762fb26bb03f874fccc52"},{"fixed":"6b39969c724d39b6062efa354dc2d38442bfd021"},{"fixed":"2e91ab73f9beb659f581e2a6a09f79ace1140905"},{"fixed":"d7deb90c4cd086cb111f0ecc9da021218fbde1b0"},{"fixed":"5310334762c3f08f51dc2414344dd47492c07d1d"},{"fixed":"ca4489b3e54666a7cac7294e71a3cf64e5e95286"},{"fixed":"6a19ad4d68c95185308cd9e5d169b10a2cf236c8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93053.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.37"},{"fixed":"5.10.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93053.json"}}],"schema_version":"1.9.0"}