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https://github.com/fkie-cad/nvd-json-data-feeds.git
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24 lines
1.4 KiB
JSON
24 lines
1.4 KiB
JSON
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{
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"id": "CVE-2021-47200",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"published": "2024-04-10T19:15:48.077",
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"lastModified": "2024-04-10T19:49:51.183",
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"vulnStatus": "Awaiting Analysis",
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"descriptions": [
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{
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"lang": "en",
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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'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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}
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],
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"metrics": {},
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/4f8e469a2384dfa4047145b0093126462cbb6dc0",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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}
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]
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}
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