CVE-2025-38674
MediumCVSS 5.5Summary
In the Linux kernel, a change was reverted that caused the dma_buf field in struct drm_gem_object to become NULL when user space released the final GEM handle, resulting in a NULL-pointer dereference. The fix restores the use of .import_attach->dmabuf.
Risk Assessment
The vulnerability can cause a kernel crash (oops/panic) due to a NULL dereference, leading to system unavailability or denial of service. The risk affects systems running a vulnerable kernel version with DRM drivers.
Recommendation
Update the Linux kernel to a version containing this fix. Monitor the stability of systems with active DRM drivers and prioritize the update if needed.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: Revert "drm/prime: Use dma_buf from GEM object instance" This reverts commit f83a9b8c7fd0557b0c50784bfdc1bbe9140c9bf8. 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
Vulnerability data from NVD (NIST) · CISA KEV · EPSS