CVE-2022-28796

A use-after-free flaw was found in the Linux kernel’s journaling layer of the ext4 and OCFS2 file system functionality in the way a user can trigger a race condition during writing to the file system. This flaw allows a local user to crash or potentially escalate their privileges on the system.

This kind of race condition is hard to trigger and there are no known reproducers to trigger it, so keeping the impact moderate.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the module jbd2 from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically. However, if using ext4 or OCFS2 file systems with journaling enabled, then cannot disable this module.