Is CVE-2026-99269 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-99269 being exploited in the wild.

How severe is CVE-2026-99269?

Informational severity, published 3 November 2026.

Which products and versions are affected?

Linux Kernel v7.1 and later (sched_ext functionality added in v7.1).

Is there a fix for CVE-2026-99269?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-99269 attacked?

It is attacked with local access, in an operating system.

Am I affected by CVE-2026-99269?

Check whether you run Linux Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-99269: Linux kernel sched_ext race condition in task dispatch handling

CVE-2026-99269 · Severity: info · Published 2026-11-03

The Linux kernel's task scheduler extension (sched_ext) contains a race condition where tasks can be moved or consumed from dispatch queues while a CPU is still updating the task's state during dequeue operations. This could allow concurrent access to task state, potentially causing scheduler instability, data corruption, or system hangs.

Technologies: Linux Kernel. Vendors: Linux.

Quick answers

Is CVE-2026-99269 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-99269 being exploited in the wild.
How severe is CVE-2026-99269?: Informational severity, published 3 November 2026.
Which products and versions are affected?: Linux Kernel v7.1 and later (sched_ext functionality added in v7.1).
Is there a fix for CVE-2026-99269?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-99269 attacked?: It is attacked with local access, in an operating system.
Am I affected by CVE-2026-99269?: Check whether you run Linux Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a race condition in sched_ext's task dispatch mechanism: a task can be found on a non-local dispatch queue (DSQ) while the dispatching CPU is still executing ops.dequeue() without having cleared the SCX_OPSS_DISPATCHING flag. The DSQ consume and move paths do not wait for dispatch completion, allowing concurrent access to task state. The fix adds scx_wait_dispatching() calls in three functions (scx_move_local_task_to_local_dsq, unlink_dsq_and_switch_rq_lock, and move_task_between_dsqs) to synchronize with ongoing dispatch operations.

Affected products

Linux Linux kernel v7.1 and later (sched_ext functionality added in v7.1)

Timeline

2026-11-03: disclosed

References

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