CVE-2022-48734

/// Technical description

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

btrfs: fix deadlock between quota disable and qgroup rescan worker

Quota disable ioctl starts a transaction before waiting for the qgroup

rescan worker completes. However, this wait can be infinite and results

in deadlock because of circular dependency among the quota disable

ioctl, the qgroup rescan worker and the other task with transaction such

as block group relocation task.

The deadlock happens with the steps following:

1) Task A calls ioctl to disable quota. It starts a transaction and

waits for qgroup rescan worker completes.

2) Task B such as block group relocation task starts a transaction and

joins to the transaction that task A started. Then task B commits to

the transaction. In this commit, task B waits for a commit by task A.

3) Task C as the qgroup rescan worker starts its job and starts a

transaction. In this transaction start, task C waits for completion

of the transaction that task A

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References