Improper locking in Linux kernel - CVE-2026-89756
Published: September 12, 2026
Vulnerability identifier: #VU149051
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89756
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper synchronization in migrate_pages_batch() when migrating large batches of folios. A local user can trigger a large batch of folio migrations to cause a denial of service.
On KVM hosts, MMU notifier invalidation callbacks can cause migration batches to run for an extended period.
Affected software
Linux kernel
How to mitigate CVE-2026-89756
Install security update from vendor's repository.