CVE-2022-49694

Summary

CVE-2022-49694 is a vulnerability affecting the Linux kernel that has been addressed. The issue involved disabling the elevator in the 'del_gendisk' function, which is used for file system requests. However, this operation was performed before freeing the scheduler tags, potentially leading to a use-after-free scenario where the q->tag_set might not be alive. To mitigate this risk, the blk_qos_exit call was also moved, as it depended on the elevator exit and kept the queue freeze in 'disk_release'. By making these changes, the vulnerability was eliminated.

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