CVE-2025-38673
MediumCVSS 5.5Summary
In the Linux kernel, the change "drm/gem-framebuffer: Use dma_buf from GEM object instance" was reverted because the dma_buf field in struct drm_gem_object is not stable over the object's lifetime. The field becomes NULL when user space releases the final GEM handle, causing a NULL-pointer dereference.
Risk Assessment
May lead to a kernel crash (NULL-pointer dereference) and denial of service on graphics systems.
Recommendation
Update the Linux kernel to a version containing the revert of this change.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: Revert "drm/gem-framebuffer: Use dma_buf from GEM object instance" This reverts commit cce16fcd7446dcff7480cd9d2b6417075ed81065. 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