SB20260424285 - Improper Check or Handling of Exceptional Conditions in Linux kernel netfs
Published: April 24, 2026
Security Bulletin ID
SB20260424285
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 Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-31438)
CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions
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 improper handling of unsupported iterator types in netfs_limit_iter() when writing a core dump to a 9P filesystem. A local user can crash a process to trigger kernel handling of an ITER_KVEC iterator and cause a denial of service.
Remediation
Install update from vendor's website.