SB2025121061 - Use-after-free in Linux kernel smb client
Published: December 10, 2025
Security Bulletin ID
SB2025121061
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2025-40328)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the open_cached_dir(), open_cached_dir_by_dentry(), drop_cached_dir_by_name(), cached_dir_offload_close() and cfids_laundromat_worker() functions in fs/smb/client/cached_dir.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.