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
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


{
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        "metrics": [
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              "content": {
                "id": "CVE-2021-47200",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-04-15T14:57:54.210831Z",
                "version": "2.0.3"
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              "type": "ssvc"
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        ],
        "providerMetadata": {
          "dateUpdated": "2024-07-03T17:48:37.560Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:07.374Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://git.kernel.org/stable/c/4f8e469a2384dfa4047145b0093126462cbb6dc0"
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            "tags": [
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            "url": "https://git.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f"
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        "title": "CVE Program Container"
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    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/drm_prime.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "5.5"
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              "status": "unaffected",
              "version": "5.16",
              "versionType": "original_commit_for_fix"
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          ]
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      ],
      "descriptions": [
        {
          "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\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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        "dateUpdated": "2024-11-04T12:01:24.143Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/4f8e469a2384dfa4047145b0093126462cbb6dc0"
        },
        {
          "url": "https://git.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f"
        }
      ],
      "title": "drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap",
      "x_generator": {
        "engine": "bippy-9e1c9544281a"
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47200",
    "datePublished": "2024-04-10T18:56:35.152Z",
    "dateReserved": "2024-03-25T09:12:14.117Z",
    "dateUpdated": "2024-11-04T12:01:24.143Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47200\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-10T19:15:48.077\",\"lastModified\":\"2024-04-10T19:49:51.183\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"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\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.\\\"\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4f8e469a2384dfa4047145b0093126462cbb6dc0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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