SB20261007139 - Improper locking in Linux kernel mm
Published: October 7, 2026
Security Bulletin ID
SB20261007139
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-98223)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to trigger a sleeping-in-atomic warning in the kernel.
The vulnerability exists due to a potentially sleeping lock acquisition in non-preemptible context in mm/filemap.c when invalidating mapped dropbehind folios after writeback completes. A local user can trigger fault-around mapping of a dropbehind folio to trigger a sleeping-in-atomic warning in the kernel.
Remediation
Install update from vendor's website.