CVE-2022-50552

blk-mq: use quiesced elevator switch when reinitializing queues

State: Published
Severity: Not scored
Published: Oct 7, 2025
Updated: Jun 1, 2026
Reserved: 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

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	d48ece209f82c9ce07be942441b53d3fa3664936 to before 0f90015383cd3f1128bebfbe7a97122d97808046Affected d48ece209f82c9ce07be942441b53d3fa3664936 to before 9646443f28f33ec545ae303e613c3f476fad4dc1Affected d48ece209f82c9ce07be942441b53d3fa3664936 to before 63a681bcc32a43528ce0f690569f7f48e59c3963Affected d48ece209f82c9ce07be942441b53d3fa3664936 to before c478b3b2900f1834cf9eda5bfef0d5696099505dAffected d48ece209f82c9ce07be942441b53d3fa3664936 to before 8237c01f1696bc53c470493bf1fe092a107648a6Affected
LinuxLinux	4.19Affected before 4.19Not affected 5.10.258 through 5.10.Not affected 5.15.209 through 5.15.Not affected 5.19.17 through 5.19.Not affected 6.0.3 through 6.0.Not affected 6.1 and laterNot affected

Product

Versions

LinuxLinux

d48ece209f82c9ce07be942441b53d3fa3664936 to before 0f90015383cd3f1128bebfbe7a97122d97808046Affected
d48ece209f82c9ce07be942441b53d3fa3664936 to before 9646443f28f33ec545ae303e613c3f476fad4dc1Affected
d48ece209f82c9ce07be942441b53d3fa3664936 to before 63a681bcc32a43528ce0f690569f7f48e59c3963Affected
d48ece209f82c9ce07be942441b53d3fa3664936 to before c478b3b2900f1834cf9eda5bfef0d5696099505dAffected
d48ece209f82c9ce07be942441b53d3fa3664936 to before 8237c01f1696bc53c470493bf1fe092a107648a6Affected

LinuxLinux

4.19Affected
before 4.19Not affected
5.10.258 through 5.10.*Not affected
5.15.209 through 5.15.*Not affected
5.19.17 through 5.19.*Not affected
6.0.3 through 6.0.*Not affected
6.1 and laterNot affected

References

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