CVE-2026-98865
kernel: sched_ext: Don't run ops.dequeue() with a DSQ lock held
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 18, 2026
Updated · October 24, 2026
Description
A flaw was found in the Linux kernel's sched_ext subsystem. A local attacker could cause a Denial of Service (DoS) by triggering a deadlock condition when running an extensible scheduler program that accesses a dispatch queue while a lock is held during task dequeue operations. This issue causes the scheduler to hang, rendering the system unresponsive.
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 · 4.4CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE-833 · Deadlock