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    "cveMetadata": {
        "cveId": "CVE-2021-47200",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-03-25T09:12:14.117Z",
        "datePublished": "2024-04-10T18:56:35.152Z",
        "dateUpdated": "2026-05-11T13:49:55.001Z"
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                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/prime: Fix use after free in mmap with drm_gem_ttm_mmap\n\ndrm_gem_ttm_mmap() drops a reference to the gem object on success. If\nthe gem object's refcount == 1 on entry to drm_gem_prime_mmap(), that\ndrop will free the gem object, and the subsequent drm_gem_object_get()\nwill be a UAF. Fix by grabbing a reference before calling the mmap\nhelper.\n\nThis issue was forseen when the reference dropping was adding in\ncommit 9786b65bc61ac (\"drm/ttm: fix mmap refcounting\"):\n  \"For that to work properly the drm_gem_object_get() call in\n  drm_gem_ttm_mmap() must be moved so it happens before calling\n  obj->funcs->mmap(), otherwise the gem refcount would go down\n  to zero.\""
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                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/drm_prime.c"
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                            "versionType": "original_commit_for_fix"
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                    "url": "https://git.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f"
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            "title": "drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap",
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                                "timestamp": "2024-04-15T14:57:54.210831Z",
                                "id": "CVE-2021-47200",
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                                        "Exploitation": "none"
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