SB20260918177 - Out-of-bounds write in Linux kernel accessibility speakup driver
Published: September 18, 2026
Security Bulletin ID
SB20260918177
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-93053)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.
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