CVE-2025-38669

Revert "drm/gem-shmem: Use dma_buf from GEM object instance"

Description

In the Linux kernel, the following vulnerability has been resolved: Revert "drm/gem-shmem: Use dma_buf from GEM object instance" This reverts commit 1a148af06000e545e714fe3210af3d77ff903c11. The dma_buf field in struct drm_gem_object is not stable over the object instance's lifetime. The field becomes NULL when user space releases the final GEM handle on the buffer object. This resulted in a NULL-pointer deref. Workarounds in commit 5307dce878d4 ("drm/gem: Acquire references on GEM handles for framebuffers") and commit f6bfc9afc751 ("drm/framebuffer: Acquire internal references on GEM handles") only solved the problem partially. They especially don't work for buffer objects without a DRM framebuffer associated. Hence, this revert to going back to using .import_attach->dmabuf. v3: - cc stable

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/291a77604858a8b47cf6640a12b76e97f99e00ed
https://git.kernel.org/stable/c/6d496e9569983a0d7a05be6661126d0702cf94f7

Frequently Asked Questions

What is the severity of CVE-2025-38669?: CVE-2025-38669 has not yet been assigned a CVSS score.
How to fix CVE-2025-38669?: To fix CVE-2025-38669, 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-2025-38669 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-38669 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-2025-38669?: CVE-2025-38669 affects Linux Linux, Linux Linux.

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