CVE-2026-98220

A flaw was found in the Linux kernel's extensible scheduler (sched_ext) subsystem. This vulnerability allows a local privileged user to cause a Denial of Service (DoS) by triggering a kernel crash. When specific scheduler compatibility functions are invoked on tasks lacking an active scheduler, such as terminated or idle processes while sub-schedulers are enabled, the kernel improperly dereferences a null pointer during error handling. This failure leads to an immediate kernel crash and loss of system availability.

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.