CVE-2026-98443

/// Technical description

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

xfs: fix cursor and pointer handling when recovering iunlink buckets

LOLLM pointed out a bug in xlog_recover_iunlink_bucket:

1. We don't null out prev_ip after releasing it, which can lead to UAF

problems if the inodegc flush call in the loop fails.

at which point I noticed even more bugs:

2. If the inodegc flush inside the loop fails, we also leak @ip.

3. We set prev_agino to agino having already advanced agino, which

results in inodes with i_prev_unlinked set to itself.

4. If we exit the bottom of the loop with prev_ip set, then prev_ip

aliases ip and we also set its i_prev_unlinked to itself.

Bugs 3 and 4 introduce loops into the unlinked list, though these loops

don't surface because we immediately flush each unlinked inode after

loading it.

Fix all of these issues.

/// 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