{"id":"CVE-2025-38669","title":"Revert \"drm/gem-shmem: Use dma_buf from GEM object instance\"","summary":"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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1a148af06000e545e714fe3210af3d77ff903c11 < 291a77604858a8b47cf6640a12b76e97f99e00ed","Linux >= 1a148af06000e545e714fe3210af3d77ff903c11 < 6d496e9569983a0d7a05be6661126d0702cf94f7","Linux 6.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T21:06:22.874605Z"},"published":"2025-08-22","updated":"2026-11-05","sourceUpdated":"2026-11-05T21:12:51.468Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38669","references":[{"url":"https://git.kernel.org/stable/c/291a77604858a8b47cf6640a12b76e97f99e00ed"},{"url":"https://git.kernel.org/stable/c/6d496e9569983a0d7a05be6661126d0702cf94f7"}],"tags":["cve.org"],"epss":0.00133,"epssPercentile":0.02862,"ingestedAt":"2026-11-05T22:38:32.018Z","slug":"CVE-2025-38669","body":"## Overview\n\nIn 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's 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't work for buffer objects without a DRM\nframebuffer associated.\n\nHence, this revert to going back to using .import_attach->dmabuf.\n\nv3:\n- cc stable\n\n## Affected\n\n- `Linux >= 1a148af06000e545e714fe3210af3d77ff903c11 < 291a77604858a8b47cf6640a12b76e97f99e00ed`\n- `Linux >= 1a148af06000e545e714fe3210af3d77ff903c11 < 6d496e9569983a0d7a05be6661126d0702cf94f7`\n- `Linux 6.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}