Improper control of a resource through its lifetime in Linux kernel - CVE-2026-99104
Published: October 29, 2026
Vulnerability identifier: #VU158489
CSH Severity: Low
CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99104
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause a denial of service by leaving affected tasks unable to run.
The vulnerability exists due to improper management of bypass dispatch claims in the Linux kernel sched_ext scx_bypass() function when propagating bypass state to descendant schedulers. A local privileged user can potentially trigger sub-scheduler enable or disable operations overlapping power-management suspend to leave tasks queued on bypass dispatch queues without a scheduler consuming them, causing a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-99104
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3