CVE-2025-21995

MEDIUM

Linux Kernel 6.2-6.6.84, 6.7-6.12.20, 6.13-6.13.8 - Fence Reference Count Leak in DRM Scheduler

Title source: llm

Description

In the Linux kernel, the following vulnerability has been resolved: drm/sched: Fix fence reference count leak The last_scheduled fence leaks when an entity is being killed and adding the cleanup callback fails. Decrement the reference count of prev when dma_fence_add_callback() fails, ensuring proper balance. [phasta: add git tag info for stable kernel]

References (4)

Core 4

Core References

Patch

https://git.kernel.org/stable/c/c76bd3c99293834de7d1dca5de536616d5655e38

Patch

https://git.kernel.org/stable/c/1135a9431160575466ea9ac37ebd756ecbe35fff

Patch

https://git.kernel.org/stable/c/35399c84dcedd6d31448fb9e1336ef52673f2882

Patch

https://git.kernel.org/stable/c/a952f1ab696873be124e31ce5ef964d36bce817f

Scores

CVSS v3 5.5

EPSS 0.0018

EPSS Percentile 7.3%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

Status published

Products (15)

linux/Kernel 6.13.0 - 6.13.9linux

linux/Kernel 6.2.0 - 6.6.85linux

linux/Kernel 6.7.0 - 6.12.21linux

Linux/Linux < 6.2

Linux/Linux 2fdb8a8f07c2f1353770a324fd19b8114e4329ac - 1135a9431160575466ea9ac37ebd756ecbe35fff

Linux/Linux 2fdb8a8f07c2f1353770a324fd19b8114e4329ac - 35399c84dcedd6d31448fb9e1336ef52673f2882

Linux/Linux 2fdb8a8f07c2f1353770a324fd19b8114e4329ac - a952f1ab696873be124e31ce5ef964d36bce817f

Linux/Linux 2fdb8a8f07c2f1353770a324fd19b8114e4329ac - c76bd3c99293834de7d1dca5de536616d5655e38

Linux/Linux 6.12.21 - 6.12.*

Linux/Linux 6.13.9 - 6.13.*

... and 5 more

Published Apr 03, 2025

Tracked Since Feb 18, 2026