CVE-2022-49137: drm/amd/amdgpu/amdgpu_cs: fix refcount leak of a dma_fence obj

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-26 · updated 2026-08-13

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/amdgpu/amdgpu_cs: fix refcount leak of a dma_fence obj This issue takes place in an error path in amdgpu_cs_fence_to_handle_ioctl(). When `info->in.what` falls into default case, the function simply returns -EINVAL, forgetting to decrement the reference count of a dma_fence obj, which is bumped earlier by amdgpu_cs_get_fence(). This may result in reference count leaks. Fix it by decreasing the refcount of specific object before returning the error code.

Affected products

Linux kernel: before 4.19.238; from 4.20 before 5.4.189; from 5.5 before 5.10.111; from 5.11 before 5.15.34; from 5.16 before 5.16.20; from 5.17 before 5.17.3 — fixed in 4.19.238, 5.10.111, 5.15.34, 5.16.20, 5.17.3, 5.4.189

How to fix

Upgrade to a fixed version: Linux kernel 4.19.238, 5.10.111, 5.15.34, 5.16.20. Check the vendor advisory for mitigations.

References

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