{
  "cveId": "CVE-2022-48914",
  "url": "https://patchblox.com/security/cve/CVE-2022-48914",
  "summary": "CVE-2022-48914 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48914, released August 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  xen/netfront: destroy queues before real_num_tx_...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  xen/netfront: destroy queues before real_num_tx_queues is zeroed  xennet_destroy_queues() relies on info-\u003Enetdev-\u003Ereal_num_tx_queues to delete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5 (\u0022net-sysfs: update the queue counts in the unregistration path\u0022), unregister_netdev() indirectly sets real_num_tx_queues to 0. Those two facts together means, that xennet_destroy_queues() called from xennet_remove() cannot do its job, because it\u0027s called after unregister_netdev(). This results in kfree-ing queues that are still linked in napi, which ultimately crashes:      BUG: kernel NULL pointer dereference, address: 0000000000000000     #PF: supervisor read access in kernel mode     #PF: error_code(0x0000) - not-present page     PGD 0 P4D 0     Oops: 0000 [#1] PREEMPT SMP PTI     CPU: 1 PID: 52 Comm: xenwatch Tainted: G        W         5.16.10-1.32.fc32.qubes.x86_64\u002B #226     RIP: 0010:free_netdev\u002B0xa3/0x1a0     Code: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff \u003C48\u003E 8b 85 60 01 00 00 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00     RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286     RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000000     RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff     RBP: fffffffffffffea0 R08: 0000000000000000 R09: 0000000000000000     R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050     R13: ffff8880065f8f88 R14: 0000000000000000 R15: ffff8880066c6680     FS:  0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000     CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033     CR2: 0000000000000000 CR3: 00000000e998c006 CR4: 00000000003706e0     Call Trace:      \u003CTASK\u003E      xennet_remove\u002B0x13d/0x300 [xen_netfront]      xenbus_dev_remove\u002B0x6d/0xf0      __device_release_driver\u002B0x17a/0x240      device_release_driver\u002B0x24/0x30      bus_remove_device\u002B0xd8/0x140      device_del\u002B0x18b/0x410      ? _raw_spin_unlock\u002B0x16/0x30      ? klist_iter_exit\u002B0x14/0x20      ? xenbus_dev_request_and_reply\u002B0x80/0x80      device_unregister\u002B0x13/0x60      xenbus_dev_changed\u002B0x18e/0x1f0      xenwatch_thread\u002B0xc0/0x1a0      ? do_wait_intr_irq\u002B0xa0/0xa0      kthread\u002B0x16b/0x190      ? set_kthread_struct\u002B0x40/0x40      ret_from_fork\u002B0x22/0x30      \u003C/TASK\u003E  Fix this by calling xennet_destroy_queues() from xennet_uninit(), when real_num_tx_queues is still available. This ensures that queues are destroyed when real_num_tx_queues is set to 0, regardless of how unregister_netdev() was called.  Originally reported at https://github.com/QubesOS/qubes-issues/issues/7257",
  "published": "2024-08-22T02:15:05Z",
  "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": 0.00215,
  "epssPercentile": 0.11965,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.16.14-1",
      "fix": "DEBIAN-CVE-2022-48914",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-48914",
      "released": "2024-08-22T02:15:05Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.16.14-1",
      "fix": "DEBIAN-CVE-2022-48914",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-48914",
      "released": "2024-08-22T02:15:05Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.16.14-1",
      "fix": "DEBIAN-CVE-2022-48914",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-48914",
      "released": "2024-08-22T02:15:05Z"
    }
  ],
  "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"
  }
}