CVE-2026-89516
Description
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.
How to fix
- Linux Linuxc480961a1e790b46ffd8c20c4b6754d65ec6572d, 8d8dd8ae89eaa78b37fc85528e926029f5facbdf or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 84b1a0ea0b7c23dec240783a592e480780efe459 ≤ v < c480961a1e790b46ffd8c20c4b6754d65ec6572d, 84b1a0ea0b7c23dec240783a592e480780efe459 ≤ v < 8d8dd8ae89eaa78b37fc85528e926029f5facbdf, 7.1 | c480961a1e790b46ffd8c20c4b6754d65ec6572d, 8d8dd8ae89eaa78b37fc85528e926029f5facbdf |
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