CVE-2025-38515

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

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.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/549a9c78c3ea6807d0dc4162a4f5ba59f217d5a0
https://git.kernel.org/stable/c/e62f51d0ec8a9baf324caf9a564f8e318d36a551
https://git.kernel.org/stable/c/ef841f8e4e1ff67817ca899bedc5ebb00847c0a7
https://git.kernel.org/stable/c/f9a4f28a4fc4ee453a92a9abbe36e26224d17749
https://git.kernel.org/stable/c/c64f5310530baf75328292f9b9f3f2961d185183
https://git.kernel.org/stable/c/e2d6547dc8b9b332f9bc00875197287a6a4db65a
https://git.kernel.org/stable/c/ef58a95457466849fa7b31fd3953801a5af0f58b
https://git.kernel.org/stable/c/8af39ec5cf2be522c8eb43a3d8005ed59e4daaee

Frequently Asked Questions

What is the severity of CVE-2025-38515?: CVE-2025-38515 has not yet been assigned a CVSS score.
How to fix CVE-2025-38515?: To fix CVE-2025-38515, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-38515 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-38515 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-38515?: CVE-2025-38515 affects Linux Linux, Linux Linux.

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