CVE-2026-93053
Description
In the Linux kernel, the following vulnerability has been resolved: speakup: keyhelp: guard letter_offsets possible out-of-range indexing help_init() builds letter_offsets[] by using the first byte of each function name as an index via `(start & 31) - 1`. If function_names are overridden from sysfs (root) with a name starting outside [a–z], the index underflows or exceeds the array, leading to OOB write. Function names can be overridden with the following commands as root: modprobe speakup_soft echo "0 _bad" > /sys/accessibility/speakup/i18n/function_names # then press Insert+2 on /dev/tty This fix checks the first letter in help_init(), and if it is not in the [a–z] range the function returns an error to the caller. Eventually this error is propagated to drivers/accessibility/speakup/main.c:2217, which causes a bleep sound.
How to fix
- Linux Linuxfd339b9ef0accb2c24a5285df842552ebf5eb146, 900cd6e5ef46bd15153762fb26bb03f874fccc52, 6b39969c724d39b6062efa354dc2d38442bfd021, 2e91ab73f9beb659f581e2a6a09f79ace1140905, d7deb90c4cd086cb111f0ecc9da021218fbde1b0, 5310334762c3f08f51dc2414344dd47492c07d1d, ca4489b3e54666a7cac7294e71a3cf64e5e95286, 6a19ad4d68c95185308cd9e5d169b10a2cf236c8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | c6e3fd22cd538365bfeb82997d5b89562e077d42 ≤ v < fd339b9ef0accb2c24a5285df842552ebf5eb146, c6e3fd22cd538365bfeb82997d5b89562e077d42 ≤ v < 900cd6e5ef46bd15153762fb26bb03f874fccc52, c6e3fd22cd538365bfeb82997d5b89562e077d42 ≤ v < 6b39969c724d39b6062efa354dc2d38442bfd021, c6e3fd22cd538365bfeb82997d5b89562e077d42 ≤ v < 2e91ab73f9beb659f581e2a6a09f79ace1140905, c6e3fd22cd538365bfeb82997d5b89562e077d42 ≤ v < d7deb90c4cd086cb111f0ecc9da021218fbde1b0, c6e3fd22cd538365bfeb82997d5b89562e077d42 ≤ v < 5310334762c3f08f51dc2414344dd47492c07d1d, c6e3fd22cd538365bfeb82997d5b89562e077d42 ≤ v < ca4489b3e54666a7cac7294e71a3cf64e5e95286, c6e3fd22cd538365bfeb82997d5b89562e077d42 ≤ v < 6a19ad4d68c95185308cd9e5d169b10a2cf236c8, 2.6.37 | fd339b9ef0accb2c24a5285df842552ebf5eb146, 900cd6e5ef46bd15153762fb26bb03f874fccc52, 6b39969c724d39b6062efa354dc2d38442bfd021, 2e91ab73f9beb659f581e2a6a09f79ace1140905, d7deb90c4cd086cb111f0ecc9da021218fbde1b0, 5310334762c3f08f51dc2414344dd47492c07d1d, ca4489b3e54666a7cac7294e71a3cf64e5e95286, 6a19ad4d68c95185308cd9e5d169b10a2cf236c8 |
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