CVE-2025-38703

/// Technical description

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

drm/xe: Make dma-fences compliant with the safe access rules

Xe can free some of the data pointed to by the dma-fences it exports. Most

notably the timeline name can get freed if userspace closes the associated

submit queue. At the same time the fence could have been exported to a

third party (for example a sync_fence fd) which will then cause an use-

after-free on subsequent access.

To make this safe we need to make the driver compliant with the newly

documented dma-fence rules. Driver has to ensure a RCU grace period

between signalling a fence and freeing any data pointed to by said fence.

For the timeline name we simply make the queue be freed via kfree_rcu and

for the shared lock associated with multiple queues we add a RCU grace

period before freeing the per GT structure holding the lock.

/// 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