SB20260424251 - NULL pointer dereference in Linux kernel smb server
Published: April 24, 2026
Security Bulletin ID
SB20260424251
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) NULL pointer dereference (CVE-ID: CVE-2026-31477)
CWE-ID: CWE-476 - NULL Pointer Dereference
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 cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in smb2_lock() when processing SMB lock rollback operations after allocation failure. A local user can trigger allocation failure during lock rollback to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/309b44ed684496ed3f9c5715d10b899338623512
- https://git.kernel.org/stable/c/3cdacd11b41569ce75b3162142240f2355e04900
- https://git.kernel.org/stable/c/91aeaa7256006d79a37298f5a1df23325db91599
- https://git.kernel.org/stable/c/aab42f0795620cf0d3955a520f571f697d0f9a2a
- https://git.kernel.org/stable/c/c9b95ef6f5039f19e46c3a521a4fe1752d91dfe9
- https://git.kernel.org/stable/c/cdac6f7e7e428dc70e3b5898ac6999a72ed13993