Laurent Guerby

**Name of the Vulnerable Software and Affected Versions** Linux kernel versions prior to 4.6 **Description** The issue is related to the mbcache feature in the ext2 and ext4 filesystem implementations. It mishandles xattr block caching, allowing local users to cause a denial of service (soft lockup) via filesystem operations in environments that use many attributes. This is demonstrated by systems using Ceph and Samba. **Recommendations** For Linux kernel versions prior to 4.6, update to version 4.6 or later to resolve the issue. As a temporary workaround, consider restricting the use of many attributes in filesystem operations to minimize the risk of exploitation.