CVE-2025-38672
MediumCVSS 5.5Summary
In the Linux kernel, a previous change regarding the dma_buf field in struct drm_gem_object was reverted because the field is not stable over the object's lifetime. The field becomes NULL when user space releases the final GEM handle, leading to a NULL-pointer dereference.
Risk Assessment
This can cause kernel crashes (oops/panic) and denial of service on systems with DRM graphics. It requires local access but can destabilize the system.
Recommendation
Update the Linux kernel to a version containing the fix (revert). Avoid outdated kernels on systems with active DRM drivers.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: Revert "drm/gem-dma: Use dma_buf from GEM object instance" This reverts commit e8afa1557f4f963c9a511bd2c6074a941c308685. 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