CVE-2025-38673 - Linux Kernel - Null Pointer Dereference in DRM GEM Object Instance

CVE-2025-38673 - Linux Kernel - Null Pointer Dereference in DRM GEM Object Instance

https://cvefeed.io/rssfeed/latest.atom / Fri, 08/22/2025 - 20:35
CVE ID : CVE-2025-38673
Published : Aug. 22, 2025, 4:15 p.m. | 52 minutes ago
Description : 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
Severity: 0.0 | NA
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