Out-of-bounds read in Linux kernel - CVE-2026-89691
Published: September 12, 2026
Vulnerability identifier: #VU149108
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89691
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose adjacent slab memory.
The vulnerability exists due to an out-of-bounds read in the RPC status dumpit handler when processing released NFSv4 compound arguments with a stale operation count. A local user can access the netlink status interface to disclose adjacent slab memory.
The exposure requires rq_status_counter to be stuck at an odd value.
Affected software
Linux kernel
How to mitigate CVE-2026-89691
Install security update from vendor's repository.