SB20251226130 - Use-after-free in Linux kernel smb client
Published: December 26, 2025 Updated: December 31, 2025
Security Bulletin ID
SB20251226130
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-2023-54076)
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 smb2_find_smb_ses_unlocked() function in fs/smb/client/smb2transport.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.