fkie_cve-2025-38669
Vulnerability from fkie_nvd
Published
2025-08-22 16:15
Modified
2025-08-22 18:08
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 |
|---|
{
"cveTags": [],
"descriptions": [
{
"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"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Revertir \"drm/gem-shmem: Usar dma_buf de la instancia del objeto GEM\". Esto revierte el commit 1a148af06000e545e714fe3210af3d77ff903c11. El campo dma_buf en la estructura drm_gem_object no es estable durante la vida \u00fatil de la instancia del objeto. El campo se vuelve nulo cuando el espacio de usuario libera el identificador GEM final en el objeto de b\u00fafer. Esto result\u00f3 en una desreferencia de puntero nulo. Las soluciones alternativas en los commit 5307dce878d4 (\"drm/gem: Adquirir referencias en identificadores GEM para framebuffers\") y f6bfc9afc751 (\"drm/framebuffer: Adquirir referencias internas en identificadores GEM\") solo resolvieron el problema parcialmente. En particular, no funcionan con objetos de b\u00fafer sin un framebuffer DRM asociado. Por lo tanto, volvemos a utilizar .import_attach-\u0026gt;dmabuf. v3: - cc estable"
}
],
"id": "CVE-2025-38669",
"lastModified": "2025-08-22T18:08:51.663",
"metrics": {},
"published": "2025-08-22T16:15:42.423",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/291a77604858a8b47cf6640a12b76e97f99e00ed"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/6d496e9569983a0d7a05be6661126d0702cf94f7"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…