Out-of-bounds read in Linux kernel - CVE-2026-89726
Published: September 12, 2026
Vulnerability identifier: #VU149081
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89726
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to read memory beyond the specified length.
The vulnerability exists due to an off-by-one out-of-bounds read in ucs2_strnlen() in lib/ucs2_string.c when processing a UCS-2 string that is not NUL-terminated within the caller-provided maximum length. A local user can supply a non-NUL-terminated UCS-2 string to read memory beyond the specified length.
Affected software
Linux kernel
How to mitigate CVE-2026-89726
Install security update from vendor's repository.