Improper initialization in Linux kernel - CVE-2026-89757
Published: September 12, 2026
Vulnerability identifier: #VU149052
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89757
CWE-ID: CWE-665
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause incorrect memory-lock accounting.
The vulnerability exists due to improper initialization of mlock_count in sort_folio() when handling an unevictable folio on a generation list. A local user can lock and unlock memory associated with an affected folio to cause incorrect memory-lock accounting.
Concurrent LRU isolation can observe a folio after it has been removed from the generation list.
Affected software
Linux kernel
How to mitigate CVE-2026-89757
Install security update from vendor's repository.