CVE-2025-38515 drm/sched: Increment job count before swapping tail spsc queue

What is CVE-2025-38515?

CVE-2025-38515 is a medium-severity vulnerability in Debian Debian Linux, published on 16 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

drm/sched: Increment job count before swapping tail spsc queue

A small race exists between spsc_queue_push and the run-job worker, in which spsc_queue_push may return not-first while the run-job worker has already idled due to the job count being zero. If this race occurs, job scheduling stops, leading to hangs while waiting on the job’s DMA fences.

Seal this race by incrementing the job count before appending to the SPSC queue.

This race was observed on a drm-tip 6.16-rc1 build with the Xe driver in an SVM test case.

Which versions are affected by CVE-2025-38515?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2025-38515?

Apply the vendor's patch.

Is CVE-2025-38515 being exploited?

There is no known exploitation of CVE-2025-38515 in the wild and no public exploit code.

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All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-66392, AZL-73545, BELL-CVE-2025-38515, DEBIAN-CVE-2025-38515, GHSA-6wqf-m4v2-8ppm, ROOT-OS-DEBIAN-11-CVE-2025-38515 and 4 more.