SB20260425126 - Use-after-free in Linux kernel mm
Published: April 25, 2026
Security Bulletin ID
SB20260425126
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) Use-after-free (CVE-ID: CVE-2026-31589)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in folio_unmap_invalidate() when accessing mapping->a_ops after the folio has been removed from the mapping and the mapping can be removed. A local user can trigger the vulnerable code path to cause a denial of service.
Remediation
Install update from vendor's website.