{
  "cveId": "CVE-2022-49300",
  "url": "https://patchblox.com/security/cve/CVE-2022-49300",
  "summary": "CVE-2022-49300 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49300, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  nbd: fix race between nbd_alloc_config() and mod...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nbd: fix race between nbd_alloc_config() and module removal  When nbd module is being removing, nbd_alloc_config() may be called concurrently by nbd_genl_connect(), although try_module_get() will return false, but nbd_alloc_config() doesn\u0027t handle it.  The race may lead to the leak of nbd_config and its related resources (e.g, recv_workq) and oops in nbd_read_stat() due to the unload of nbd module as shown below:    BUG: kernel NULL pointer dereference, address: 0000000000000040   Oops: 0000 [#1] SMP PTI   CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0\u002B #1   Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996)   Workqueue: knbd16-recv recv_work [nbd]   RIP: 0010:nbd_read_stat.cold\u002B0x130/0x1a4 [nbd]   Call Trace:    recv_work\u002B0x3b/0xb0 [nbd]    process_one_work\u002B0x1ed/0x390    worker_thread\u002B0x4a/0x3d0    kthread\u002B0x12a/0x150    ret_from_fork\u002B0x22/0x30  Fixing it by checking the return value of try_module_get() in nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV), assign nbd-\u003Econfig only when nbd_alloc_config() succeeds to ensure the value of nbd-\u003Econfig is binary (valid or NULL).  Also adding a debug message to check the reference counter of nbd_config during module removal.",
  "published": "2025-02-26T07:01:06Z",
  "severity": "medium",
  "cvss": 4.7,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00192,
  "epssPercentile": 0.08926,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.18.5-1",
      "fix": "DEBIAN-CVE-2022-49300",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49300",
      "released": "2025-02-26T07:01:06Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.18.5-1",
      "fix": "DEBIAN-CVE-2022-49300",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49300",
      "released": "2025-02-26T07:01:06Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.18.5-1",
      "fix": "DEBIAN-CVE-2022-49300",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49300",
      "released": "2025-02-26T07:01:06Z"
    }
  ],
  "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"
  }
}