Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c6e3fd22cd538365bfeb82997d5b89562e077d42 before fd339b9ef0accb2c24a5285df842552ebf5eb146; affected c6e3fd22cd538365bfeb82997d5b89562e077d42 before 900cd6e5ef46bd15153762fb26bb03f874fccc52; affected c6e3fd22cd538365bfeb82997d5b89562e077d42 before 6b39969c724d39b6062efa354dc2d38442bfd021; affected c6e3fd22cd538365bfeb82997d5b89562e077d42 before 2e91ab73f9beb659f581e2a6a09f79ace1140905; affected c6e3fd22cd538365bfeb82997d5b89562e077d42 before d7deb90c4cd086cb111f0ecc9da021218fbde1b0; affected c6e3fd22cd538365bfeb82997d5b89562e077d42 before 5310334762c3f08f51dc2414344dd47492c07d1d; affected c6e3fd22cd538365bfeb82997d5b89562e077d42 before ca4489b3e54666a7cac7294e71a3cf64e5e95286; affected c6e3fd22cd538365bfeb82997d5b89562e077d42 before 6a19ad4d68c95185308cd9e5d169b10a2cf236c8 |
| Linux / Linux | affected 2.6.37; unaffected 0 before 2.6.37; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/fd339b9ef0accb2c24a5285df842552ebf5eb146
- https://git.kernel.org/stable/c/900cd6e5ef46bd15153762fb26bb03f874fccc52
- https://git.kernel.org/stable/c/6b39969c724d39b6062efa354dc2d38442bfd021
- https://git.kernel.org/stable/c/2e91ab73f9beb659f581e2a6a09f79ace1140905
- https://git.kernel.org/stable/c/d7deb90c4cd086cb111f0ecc9da021218fbde1b0
- https://git.kernel.org/stable/c/5310334762c3f08f51dc2414344dd47492c07d1d
- https://git.kernel.org/stable/c/ca4489b3e54666a7cac7294e71a3cf64e5e95286
- https://git.kernel.org/stable/c/6a19ad4d68c95185308cd9e5d169b10a2cf236c8