{
  "cveId": "CVE-2021-47280",
  "url": "https://patchblox.com/security/cve/CVE-2021-47280",
  "summary": "CVE-2021-47280 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47280, released May 21, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  drm: Fix use-after-free read in drm_getunique()...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  drm: Fix use-after-free read in drm_getunique()  There is a time-of-check-to-time-of-use error in drm_getunique() due to retrieving file_priv-\u003Emaster prior to locking the device\u0027s master mutex.  An example can be seen in the crash report of the use-after-free error found by Syzbot: https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803  In the report, the master pointer was used after being freed. This is because another process had acquired the device\u0027s master mutex in drm_setmaster_ioctl(), then overwrote fpriv-\u003Emaster in drm_new_set_master(). The old value of fpriv-\u003Emaster was subsequently freed before the mutex was unlocked.  To fix this, we lock the device\u0027s master mutex before retrieving the pointer from from fpriv-\u003Emaster. This patch passes the Syzbot reproducer test.",
  "published": "2024-05-21T15:15:16Z",
  "severity": "high",
  "cvss": 7,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00183,
  "epssPercentile": 0.07926,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47280",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47280",
      "released": "2024-05-21T15:15:16Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47280",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47280",
      "released": "2024-05-21T15:15:16Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47280",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47280",
      "released": "2024-05-21T15:15:16Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}