CVE-2026-64356

Technical Description

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

xfs: fix memory leak in xfs_dqinode_metadir_create()

If xfs_metadir_create() fails in xfs_dqinode_metadir_create(), the current

code returns directly, leaking the allocated update and transaction state.

If the subsequent commit fails, the caller-owned inode reference is left

behind.

Fix this memory leak by routing the create failure path through

xfs_metadir_cancel(). For both create and commit failures, finish and

release any inode returned to the caller, mirroring the unwind pattern in

xfs_metadir_mkdir().

The bug was first flagged by an experimental analysis tool we are

developing for kernel memory-management bugs while analyzing

v6.13-rc1. The tool is still under development and is not yet publicly

available. Manual inspection confirms that the bug is still

present in v7.1.1.

An x86_64 allyesconfig build showed no new warnings. Runtime validation

used kprobe fault injection during `mount -o uquota` on a metadi

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