{
  "cveId": "CVE-2021-47231",
  "url": "https://patchblox.com/security/cve/CVE-2021-47231",
  "summary": "CVE-2021-47231 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47231, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  can: mcba_usb: fix memory leak in mcba_usb  Syzb...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  can: mcba_usb: fix memory leak in mcba_usb  Syzbot reported memory leak in SocketCAN driver for Microchip CAN BUS Analyzer Tool. The problem was in unfreed usb_coherent.  In mcba_usb_start() 20 coherent buffers are allocated and there is nothing, that frees them:  1) In callback function the urb is resubmitted and that\u0027s all 2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER    is not set (see mcba_usb_start) and this flag cannot be used with    coherent buffers.  Fail log: | [ 1354.053291][ T8413] mcba_usb 1-1:0.0 can0: device disconnected | [ 1367.059384][ T8420] kmemleak: 20 new suspected memory leaks (see /sys/kernel/debug/kmem)  So, all allocated buffers should be freed with usb_free_coherent() explicitly  NOTE: The same pattern for allocating and freeing coherent buffers is used in drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c",
  "published": "2024-05-21T15:15:12Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00226,
  "epssPercentile": 0.13384,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47231",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47231",
      "released": "2024-05-21T15:15:12Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47231",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47231",
      "released": "2024-05-21T15:15:12Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47231",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47231",
      "released": "2024-05-21T15:15:12Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}