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CVE-2026-93053

Unknown

Last modified

CVE-2026-93053 is a vulnerability of currently unknown severity. 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.

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= c6e3fd22cd538365bfeb82997d5b89562e077d42, < fd339b9ef0accb2c24a5285df842552ebf5eb146; >= c6e3fd22cd538365bfeb82997d5b89562e077d42, < 900cd6e5ef46bd15153762fb26bb03f874fccc52; >= c6e3fd22cd538365bfeb82997d5b89562e077d42, < 6b39969c724d39b6062efa354dc2d38442bfd021; >= c6e3fd22cd538365bfeb82997d5b89562e077d42, < 2e91ab73f9beb659f581e2a6a09f79ace1140905; >= c6e3fd22cd538365bfeb82997d5b89562e077d42, < d7deb90c4cd086cb111f0ecc9da021218fbde1b0; >= c6e3fd22cd538365bfeb82997d5b89562e077d42, < 5310334762c3f08f51dc2414344dd47492c07d1d; >= c6e3fd22cd538365bfeb82997d5b89562e077d42, < ca4489b3e54666a7cac7294e71a3cf64e5e95286; >= c6e3fd22cd538365bfeb82997d5b89562e077d42, < 6a19ad4d68c95185308cd9e5d169b10a2cf236c8
LinuxLinux2.6.37

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-93053?
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 severe is CVE-2026-93053?
Severity scoring for CVE-2026-93053 is pending analysis.
How do I fix CVE-2026-93053?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST