Insufficient Control Flow Management in Linux kernel - CVE-2026-99105
Published: October 29, 2026
Vulnerability identifier: #VU158490
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-2026-99105
CWE-ID: CWE-691
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service by stalling runnable tasks.
The vulnerability exists due to improper control flow management in the Linux kernel sched_ext function put_prev_task_scx() when a task enqueued with SCX_ENQ_LAST returns to its CPU's local dispatch queue after the scheduler has selected the idle task. A local user can trigger affected task scheduling paths under a scheduler using SCX_OPS_ENQ_LAST to leave runnable tasks queued while the CPU remains idle until an unrelated wakeup or watchdog intervention.
Affected software
Linux kernel
How to mitigate CVE-2026-99105
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3