SB20260424294 - NULL pointer dereference in Linux kernel netfs
Published: April 24, 2026
Security Bulletin ID
SB20260424294
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-2026-31437)
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 netfs_unbuffered_write() when retrying a write subrequest after get_user_pages() fails with -EFAULT. A local user can trigger a retry condition during an unbuffered write to cause a denial of service.
This affects filesystems that do not define the prepare_write operation.
Remediation
Install update from vendor's website.