CVE-2025-68223: drm/radeon: delete radeon_fence_process in is_signaled, no deadlock

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-16 · updated 2026-10-14
Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: drm/radeon: delete radeon_fence_process in is_signaled, no deadlock Delete the attempt to progress the queue when checking if fence is signaled. This avoids deadlock. dma-fence_ops::signaled can be called with the fence lock in unknown state. For radeon, the fence lock is also the wait queue lock. This can cause a self deadlock when signaled() tries to make forward progress on the wait queue. But advancing the queue is unneeded because incorrectly returning false from signaled() is perfectly acceptable. (cherry picked from commit 527ba26e50ec2ca2be9c7c82f3ad42998a75d0db)

Affected products

Linux kernel: from 3.18 before 6.1.162; from 6.2 before 6.6.123; from 6.7 before 6.12.60; from 6.13 before 6.17.10; 6.18-rc1, 6.18-rc2, 6.18-rc3, 6.18-rc4, 6.18-rc5, 6.18-rc6 — fixed in 6.1.162, 6.12.60, 6.17.10, 6.6.123

How to fix

Upgrade to a fixed version: Linux kernel 6.1.162, 6.12.60, 6.17.10, 6.6.123. Check the vendor advisory for mitigations.

References

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