{
  "cveId": "CVE-2021-47200",
  "url": "https://patchblox.com/security/cve/CVE-2021-47200",
  "summary": "CVE-2021-47200 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47200, released April 10, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  drm/prime: Fix use after free in mmap with drm_g...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap  drm_gem_ttm_mmap() drops a reference to the gem object on success. If the gem object\u0027s refcount == 1 on entry to drm_gem_prime_mmap(), that drop will free the gem object, and the subsequent drm_gem_object_get() will be a UAF. Fix by grabbing a reference before calling the mmap helper.  This issue was forseen when the reference dropping was adding in commit 9786b65bc61ac (\u0022drm/ttm: fix mmap refcounting\u0022):   \u0022For that to work properly the drm_gem_object_get() call in   drm_gem_ttm_mmap() must be moved so it happens before calling   obj-\u003Efuncs-\u003Emmap(), otherwise the gem refcount would go down   to zero.\u0022",
  "published": "2024-04-10T19:15:48Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00221,
  "epssPercentile": 0.12771,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.15.5-1",
      "fix": "DEBIAN-CVE-2021-47200",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47200",
      "released": "2024-04-10T19:15:48Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.15.5-1",
      "fix": "DEBIAN-CVE-2021-47200",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47200",
      "released": "2024-04-10T19:15:48Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.15.5-1",
      "fix": "DEBIAN-CVE-2021-47200",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47200",
      "released": "2024-04-10T19:15:48Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}