Improper locking in Linux kernel - CVE-2026-89753
Published: September 12, 2026
Vulnerability identifier: #VU149046
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-2026-89753
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause RCU Tasks stalls.
The vulnerability exists due to improper RCU quiescent-state handling in shrink_lruvec() in mm/vmscan.c when performing direct memory reclaim. A local user can trigger direct memory reclaim to cause RCU Tasks stalls.
The issue occurs on PREEMPTION kernels, where cond_resched() does not report a Tasks-RCU quiescent state.
Affected software
Linux kernel
How to mitigate CVE-2026-89753
Install security update from vendor's repository.