CVE-2025-39927

Technical Description

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

ceph: fix race condition validating r_parent before applying state

Add validation to ensure the cached parent directory inode matches the

directory info in MDS replies. This prevents client-side race conditions

where concurrent operations (e.g. rename) cause r_parent to become stale

between request initiation and reply processing, which could lead to

applying state changes to incorrect directory inodes.

[ idryomov: folded a kerneldoc fixup and a follow-up fix from Alex to

move CEPH_CAP_PIN reference when r_parent is updated:

When the parent directory lock is not held, req->r_parent can become

stale and is updated to point to the correct inode. However, the

associated CEPH_CAP_PIN reference was not being adjusted. The

CEPH_CAP_PIN is a reference on an inode that is tracked for

accounting purposes. Moving this pin is important to keep the

accounting balanced. When the pin was not moved from the old p

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References