CVE-2026-89516sched_ext: Don't BUG_ON a destroyed DSQ in process_deferred_reenq_users
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 84b1a0ea0b7c23dec240783a592e480780efe459 before c480961a1e790b46ffd8c20c4b6754d65ec6572d; 84b1a0ea0b7c23dec240783a592e480780efe459 builds before 8d8dd8ae89eaa78b37fc85528e926029f5facbdf | CNA record |
References
- https://git.kernel.org/stable/c/c480961a1e790b46ffd8c20c4b6754d65ec6572d
- https://git.kernel.org/stable/c/8d8dd8ae89eaa78b37fc85528e926029f5facbdf
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.