CVE-2026-99104
kernel: sched_ext: Fix the bypass dispatch claim for schedulers bypassed by an ancestor
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 28, 2026
Updated · October 29, 2026
Description
A flaw was found in the Linux kernel's extensible scheduler (sched_ext) subsystem. This vulnerability allows a local user to cause a denial of service (DoS) or system instability during power management operations. Due to improper tracking of bypass dispatch states across hierarchical schedulers during system suspend and resume cycles, tasks can become stranded in internal queues without being processed, halting task execution.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 4.1CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE-911 · Improper Update of Reference Count