Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-31734
Published: May 2, 2026
Vulnerability identifier: #VU128953
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-31734
CWE-ID: CWE-670
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper state handling in is_bpf_migration_disabled() when checking whether a task is migration-disabled on systems without CONFIG_PREEMPT_RCU. A local user can trigger task dispatch to a remote CPU for a migration-disabled task to cause a denial of service.
The issue can trigger scx_error in task_can_run_on_remote_rq().
How to mitigate CVE-2026-31734
Install security update from vendor's repository.