CVE-2023-53629

A flaw was found in the Linux kernel, specifically within the Distributed Lock Manager (DLM) midcomms component. A timing issue, known as a race condition, can occur during message processing. This can lead to a 'use-after-free' vulnerability, where the system attempts to use memory that has already been released. Exploitation of this flaw can cause the kernel to crash, resulting in a Denial of Service (DoS) for the affected system.

A race in DLM midcomms (dlm_midcomms_commit_mhandle() for v3.2) could free a message handle upon an early ACK while it’s still being used, leading to a kernel UAF and crash. The fix surrounds the commit path with RCU read locking to prevent premature reclamation.

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.