UBUNTU-CVE-2026-99269

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UBUNTU-CVE-2026-99269

Summary:

Details: In the Linux kernel, the following vulnerability has been resolved: sched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs A task can be found on a non-local DSQ while the CPU which dispatched it is still running ops.dequeue() and hasn't cleared SCX_OPSS_DISPATCHING. The DSQ consume and move paths don't wait for the dispatch to finish and can operate on the task concurrently with the dispatcher. Call scx_wait_dispatching() in scx_move_local_task_to_local_dsq(), unlink_dsq_and_switch_rq_lock() and move_task_between_dsqs() before they operate on the task. In scx_move_local_task_to_local_dsq(), wait before scx_resolve_local_dsq() as it may update p->scx.flags.

References: https://ubuntu.com/security/CVE-2026-99269, https://www.cve.org/CVERecord?id=CVE-2026-99269, https://git.kernel.org/stable/c/2935062be77113c1c4565ca9d0c72180449aafee, https://git.kernel.org/stable/c/cc2839946328c1618b3870d521b32bb9483d49d0