SB2026040640 - Use-after-free in Linux kernel nfsd
Published: April 6, 2026
Security Bulletin ID
SB2026040640
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-31404)
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to a use-after-free in NFSD export cache object cleanup when accessing export information through RCU readers concurrently with cache entry removal. A local attacker can trigger concurrent export cache cleanup and access to freed sub-objects to cause a denial of service.
The issue can result in a NULL pointer dereference in d_path when ex_path or ex_client->name related sub-objects are freed before the RCU grace period completes.
Remediation
Install update from vendor's website.