CVE-2022-49377

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb6e68ee82585f2ee890b0a897a6aacbf49a467bb < 460aa288c5cd0544dcf933a2f0ad0e8c6d2d35ffaffected
LinuxLinuxb6e68ee82585f2ee890b0a897a6aacbf49a467bb < b140bac470b4f707cda59c7266214246238661dfaffected
LinuxLinuxb6e68ee82585f2ee890b0a897a6aacbf49a467bb < 70fdd922c7bf8949f8df109cf2635dff64c90392affected
LinuxLinuxb6e68ee82585f2ee890b0a897a6aacbf49a467bb < 5d05426e2d5fd7df8afc866b78c36b37b00188b7affected
LinuxLinux5.12affected
LinuxLinux0 < 5.12unaffected
LinuxLinux5.15.47 <= 5.15.*unaffected
LinuxLinux5.17.15 <= 5.17.*unaffected
LinuxLinux5.18.4 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References