CVE-2021-47200
Vulnerability from cvelistv5
Published
2024-04-10 18:56
Modified
2024-11-04 12:01
Severity ?
Summary
drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4f8e469a2384dfa4047145b0093126462cbb6dc0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4f8e469a2384dfa4047145b0093126462cbb6dc0
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f
Impacted products
Vendor Product Version
Linux Linux Version: 5.5
Show details on NVD website

To clipboard 

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          "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\u0027s 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-\u003efuncs-\u003emmap(), otherwise the gem refcount would go down\n  to zero.\""
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