ghsa-5qx5-jpr4-rw99
Vulnerability from github
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
{
"affected": [],
"aliases": [
"CVE-2025-38673"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-08-22T16:15:42Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"drm/gem-framebuffer: Use dma_buf from GEM object instance\"\n\nThis reverts commit cce16fcd7446dcff7480cd9d2b6417075ed81065.\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",
"id": "GHSA-5qx5-jpr4-rw99",
"modified": "2025-08-22T18:31:23Z",
"published": "2025-08-22T18:31:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38673"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2712ca878b688682ac2ce02aefc413fc76019cd9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e31f5a1c2cd38bf977736cdfa79444e19d4005ec"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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