SB20251208103 - Improper locking in Linux kernel nfsd
Published: December 8, 2025
Security Bulletin ID
SB20251208103
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) Improper locking (CVE-ID: CVE-2025-40273)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the nfs4_free_ol_stateid() function in fs/nfsd/nfs4state.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/29fbb3ad4018ca2b0988fbac76f4c694cc6d7e66
- https://git.kernel.org/stable/c/4aa17144d5abc3c756883e3a010246f0dba8b468
- https://git.kernel.org/stable/c/839f56f626723f36904764858467e7a3881b975d
- https://git.kernel.org/stable/c/935a2dc8928670bb2c37e21025331e61ec48ccf4
- https://git.kernel.org/stable/c/b114996a095da39e38410a0328d4a8aca8c36088
- https://git.kernel.org/stable/c/d7be15a634aa3874827d0d3ea47452ee878b8df7
- https://git.kernel.org/stable/c/f67ad9b33b0e6f00d2acc67cbf9cfa5c756be5fb