CVE-2025-38669 (GCVE-0-2025-38669)
Vulnerability from cvelistv5
Published
2025-08-22 16:03
Modified
2025-08-22 16:03
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Revert "drm/gem-shmem: Use dma_buf from GEM object instance" This reverts commit 1a148af06000e545e714fe3210af3d77ff903c11. 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
References
Impacted products
Vendor Product Version
Linux Linux Version: 1a148af06000e545e714fe3210af3d77ff903c11
Version: 1a148af06000e545e714fe3210af3d77ff903c11
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/drm_gem_shmem_helper.c"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"drm/gem-shmem: Use dma_buf from GEM object instance\"\n\nThis reverts commit 1a148af06000e545e714fe3210af3d77ff903c11.\n\nThe dma_buf field in struct drm_gem_object is not stable over the\nobject instance\u0027s lifetime. The field becomes NULL when user space\nreleases the final GEM handle on the buffer object. This resulted\nin a NULL-pointer deref.\n\nWorkarounds in commit 5307dce878d4 (\"drm/gem: Acquire references on\nGEM handles for framebuffers\") and commit f6bfc9afc751 (\"drm/framebuffer:\nAcquire internal references on GEM handles\") only solved the problem\npartially. They especially don\u0027t work for buffer objects without a DRM\nframebuffer associated.\n\nHence, this revert to going back to using .import_attach-\u003edmabuf.\n\nv3:\n- cc stable"
        }
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      "providerMetadata": {
        "dateUpdated": "2025-08-22T16:03:00.399Z",
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        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/6d496e9569983a0d7a05be6661126d0702cf94f7"
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      ],
      "title": "Revert \"drm/gem-shmem: Use dma_buf from GEM object instance\"",
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    "cveId": "CVE-2025-38669",
    "datePublished": "2025-08-22T16:03:00.399Z",
    "dateReserved": "2025-04-16T04:51:24.031Z",
    "dateUpdated": "2025-08-22T16:03:00.399Z",
    "state": "PUBLISHED"
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  }
}


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