SB2026091285 - Out-of-bounds read in Linux kernel nfsd
Published: September 12, 2026
Security Bulletin ID
SB2026091285
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-89691)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.