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

The following table lists the changes that have been made to the
CVE-2025-38673 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 22, 2025

    Action Type Old Value New Value
    Added 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
    Added Reference https://git.kernel.org/stable/c/2712ca878b688682ac2ce02aefc413fc76019cd9
    Added Reference https://git.kernel.org/stable/c/e31f5a1c2cd38bf977736cdfa79444e19d4005ec
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