CVE-2026-99105
kernel: sched_ext: Fix stall when a task enqueued with SCX_ENQ_LAST lands back on its CPU's local DSQ
Severity
LowRed 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 sched_ext scheduler component. When a task is placed back onto a CPU's local dispatch queue under specific scheduler configurations, the kernel fails to reschedule the CPU, causing it to idle while tasks wait to execute. A local user can trigger this condition during process lifecycle operations, such as process termination, leading to system stalls and a Denial of Service (DoS).
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 · 2.5CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
CWE-821 · Incorrect Synchronization