SB2026091293 - Use-after-free in Linux kernel nfsd
Published: September 12, 2026
Security Bulletin ID
SB2026091293
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) Use-after-free (CVE-ID: CVE-2026-89682)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a use-after-free.
The vulnerability exists due to a use-after-free in the NFS server file cache disposal queue when file disposal occurs during per-network namespace teardown. A local user can trigger deferred file disposal while callbacks access the disposal queue to cause a use-after-free.
The global shrinker, laundrette, and fsnotify callbacks can access the queue during teardown.
Remediation
Install update from vendor's website.