CVE-2022-48733

/// Technical description

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

btrfs: fix use-after-free after failure to create a snapshot

At ioctl.c:create_snapshot(), we allocate a pending snapshot structure and

then attach it to the transaction's list of pending snapshots. After that

we call btrfs_commit_transaction(), and if that returns an error we jump

to 'fail' label, where we kfree() the pending snapshot structure. This can

result in a later use-after-free of the pending snapshot:

1) We allocated the pending snapshot and added it to the transaction's

list of pending snapshots;

2) We call btrfs_commit_transaction(), and it fails either at the first

call to btrfs_run_delayed_refs() or btrfs_start_dirty_block_groups().

In both cases, we don't abort the transaction and we release our

transaction handle. We jump to the 'fail' label and free the pending

snapshot structure. We return with the pending snapshot still in the

transaction's list;

3) Another task commits the tr

/// 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