CVE-2022-48846

Summary

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

block: release rq qos structures for queue without disk

blkcg_init_queue() may add rq qos structures to request queue, previously blk_cleanup_queue() calls rq_qos_exit() to release them, but commit 8e141f9eb803 ("block: drain file system I/O on del_gendisk") moves rq_qos_exit() into del_gendisk(), so memory leak is caused because queues may not have disk, such as un-present scsi luns, nvme admin queue, …

Fixes the issue by adding rq_qos_exit() to blk_cleanup_queue() back.

BTW, v5.18 won't need this patch any more since we move blkcg_init_queue()/blkcg_exit_queue() into disk allocation/release handler, and patches have been in for-5.18/block.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8e141f9eb803e209714a80aa6ec073893f94c526 < d4ad8736ac982111bb0be8306bf19c8207f6600eaffected
LinuxLinux8e141f9eb803e209714a80aa6ec073893f94c526 < 60c2c8e2ef3a3ec79de8cbc80a06ca0c21df8c29affected
LinuxLinux8e141f9eb803e209714a80aa6ec073893f94c526 < daaca3522a8e67c46e39ef09c1d542e866f85f3baffected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux5.15.31 <= 5.15.*unaffected
LinuxLinux5.16.17 <= 5.16.*unaffected
LinuxLinux5.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References