# CVE-2022-50552: linux: In the Linux kernel, the following vulnerability has been resolved:  blk-mq: use quiesced elevator switch when reinit...

CVE-2022-50552 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50552, released October 7, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-50552
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 7, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  blk-mq: use quiesced elevator switch when reinitializing queues  The hctx's run_work may be racing with the elevator switch when reinitializing hardware queues. The queue is merely frozen in this context, but that only prevents requests from allocating and doesn't stop the hctx work from running. The work may get an elevator pointer that's being torn down, and can result in use-after-free errors and kernel panics (example below). Use the quiesced elevator switch instead, and make the previous one static since it is now only used locally.    nvme nvme0: resetting controller   nvme nvme0: 32/0/0 default/read/poll queues   BUG: kernel NULL pointer dereference, address: 0000000000000008   #PF: supervisor read access in kernel mode   #PF: error_code(0x0000) - not-present page   PGD 80000020c8861067 P4D 80000020c8861067 PUD 250f8c8067 PMD 0   Oops: 0000 [#1] SMP PTI   Workqueue: kblockd blk_mq_run_work_fn   RIP: 0010:kyber_has_work+0x29/0x70  ...    Call Trace:    __blk_mq_do_dispatch_sched+0x83/0x2b0    __blk_mq_sched_dispatch_requests+0x12e/0x170    blk_mq_sched_dispatch_requests+0x30/0x60    __blk_mq_run_hw_queue+0x2b/0x50    process_one_work+0x1ef/0x380    worker_thread+0x2d/0x3e0

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.3-1 | [DEBIAN-CVE-2022-50552](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50552.md) | Oct 7, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.3-1 | [DEBIAN-CVE-2022-50552](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50552.md) | Oct 7, 2025 |
| Linux | linux Debian 14 | 6.0.3-1 | [DEBIAN-CVE-2022-50552](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50552.md) | Oct 7, 2025 |

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