CVE-2026-89516

In the Linux kernel, the following vulnerability has been resolved: sched_ext: Don't BUG_ON a destroyed DSQ in process_deferred_reenq_users scx_bpf_dsq_reenq() queues a deferred reenq (dru) that runs from run_deferred(), not ops.dispatch(). If the DSQ is destroyed before the dru runs, process_deferred_reenq_users() sees dsq->id == SCX_DSQ_INVALID and hits the BUG_ON. destroy_dsq() doesn't flush pending drus, so just skip. tj: Read dsq->id once with READ_ONCE(). Reading it separately in the INVALID check and the BUG_ON would leave a window where destroy_dsq() can invalidate the id between the two reads and still trigger the BUG_ON.

• https://git.kernel.org/stable/c/8d8dd8ae89eaa78b37fc85528e926029f5facbdf
• https://git.kernel.org/stable/c/c480961a1e790b46ffd8c20c4b6754d65ec6572d

Published

Sep 11, 2026

Last Modified

Sep 11, 2026

Status

Received

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