Riskcovery

CVE-2022-49377

blk-mq: don't touch ->tagset in blk_mq_get_sq_hctx

State
Published
Severity
7.8 High
Published
Feb 26, 2025
Updated
Aug 5, 2026
Reserved
Feb 26, 2025

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

blk-mq: don't touch ->tagset in blk_mq_get_sq_hctx

blk_mq_run_hw_queues() could be run when there isn't queued request and after queue is cleaned up, at that time tagset is freed, because tagset lifetime is covered by driver, and often freed after blk_cleanup_queue() returns.

So don't touch ->tagset for figuring out current default hctx by the mapping built in request queue, so use-after-free on tagset can be avoided. Meantime this way should be fast than retrieving mapping from tagset.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCISA-ADP

Weaknesses

Affected Products

ProductVersions
LinuxLinux
  • b6e68ee82585f2ee890b0a897a6aacbf49a467bb to before 460aa288c5cd0544dcf933a2f0ad0e8c6d2d35ffAffected
  • b6e68ee82585f2ee890b0a897a6aacbf49a467bb to before b140bac470b4f707cda59c7266214246238661dfAffected
  • b6e68ee82585f2ee890b0a897a6aacbf49a467bb to before 70fdd922c7bf8949f8df109cf2635dff64c90392Affected
  • b6e68ee82585f2ee890b0a897a6aacbf49a467bb to before 5d05426e2d5fd7df8afc866b78c36b37b00188b7Affected
LinuxLinux
  • 5.12Affected
  • before 5.12Not affected
  • 5.15.47 through 5.15.*Not affected
  • 5.17.15 through 5.17.*Not affected
  • 5.18.4 through 5.18.*Not affected
  • 5.19 and laterNot affected

References

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