# CVE-2026-89516: linux: In the Linux kernel, the following vulnerability has been resolved:  sched_ext: Don't BUG_ON a destroyed DSQ in proce...

CVE-2026-89516 is fixed in linux on 1 platform by DEBIAN-CVE-2026-89516 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-89516
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 11, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-89516](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89516.md) | Sep 23, 2026 |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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