Out-of-bounds write in Linux kernel - CVE-2026-93053
Published: September 18, 2026
Vulnerability identifier: #VU150976
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93053
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause an out-of-bounds write.
The vulnerability exists due to improper validation of function-name initial characters in the speakup keyhelp letter_offsets[] handling when processing function names overridden through sysfs. A local privileged user can override a function name with an initial character outside the a-z range to cause an out-of-bounds write.
Affected software
Linux kernel
How to mitigate CVE-2026-93053
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/2e91ab73f9beb659f581e2a6a09f79ace1140905
- https://git.kernel.org/stable/c/5310334762c3f08f51dc2414344dd47492c07d1d
- https://git.kernel.org/stable/c/6a19ad4d68c95185308cd9e5d169b10a2cf236c8
- https://git.kernel.org/stable/c/6b39969c724d39b6062efa354dc2d38442bfd021
- https://git.kernel.org/stable/c/900cd6e5ef46bd15153762fb26bb03f874fccc52
- https://git.kernel.org/stable/c/ca4489b3e54666a7cac7294e71a3cf64e5e95286
- https://git.kernel.org/stable/c/d7deb90c4cd086cb111f0ecc9da021218fbde1b0
- https://git.kernel.org/stable/c/fd339b9ef0accb2c24a5285df842552ebf5eb146