SB2025090877 - Improper locking in Linux kernel nfs
Published: September 8, 2025
Security Bulletin ID
SB2025090877
CSH 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 vulnerability.
1) Improper locking (CVE-ID: CVE-2025-39697)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the nfs_page_set_inode_ref(), nfs_page_group_lock() and nfs_inode_remove_request() functions in fs/nfs/write.c, within the nfs_page_group_unlock() function in fs/nfs/pagelist.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.