ghsa-r864-6v77-6j77
Vulnerability from github
Published
2025-04-14 21:32
Modified
2025-04-14 21:32
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

nbd: call genl_unregister_family() first in nbd_cleanup()

Otherwise there may be race between module removal and the handling of netlink command, which can lead to the oops as shown below:

BUG: kernel NULL pointer dereference, address: 0000000000000098 Oops: 0002 [#1] SMP PTI CPU: 1 PID: 31299 Comm: nbd-client Tainted: G E 5.14.0-rc4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:down_write+0x1a/0x50 Call Trace: start_creating+0x89/0x130 debugfs_create_dir+0x1b/0x130 nbd_start_device+0x13d/0x390 [nbd] nbd_genl_connect+0x42f/0x748 [nbd] genl_family_rcv_msg_doit.isra.0+0xec/0x150 genl_rcv_msg+0xe5/0x1e0 netlink_rcv_skb+0x55/0x100 genl_rcv+0x29/0x40 netlink_unicast+0x1a8/0x250 netlink_sendmsg+0x21b/0x430 _syssendmsg+0x2a4/0x2d0 _sys_sendmsg+0x81/0xc0 __sys_sendmsg+0x62/0xb0 __x64_sys_sendmsg+0x1f/0x30 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae Modules linked in: nbd(E-)

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49295"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:06Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: call genl_unregister_family() first in nbd_cleanup()\n\nOtherwise there may be race between module removal and the handling of\nnetlink command, which can lead to the oops as shown below:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000098\n  Oops: 0002 [#1] SMP PTI\n  CPU: 1 PID: 31299 Comm: nbd-client Tainted: G            E     5.14.0-rc4\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\n  RIP: 0010:down_write+0x1a/0x50\n  Call Trace:\n   start_creating+0x89/0x130\n   debugfs_create_dir+0x1b/0x130\n   nbd_start_device+0x13d/0x390 [nbd]\n   nbd_genl_connect+0x42f/0x748 [nbd]\n   genl_family_rcv_msg_doit.isra.0+0xec/0x150\n   genl_rcv_msg+0xe5/0x1e0\n   netlink_rcv_skb+0x55/0x100\n   genl_rcv+0x29/0x40\n   netlink_unicast+0x1a8/0x250\n   netlink_sendmsg+0x21b/0x430\n   ____sys_sendmsg+0x2a4/0x2d0\n   ___sys_sendmsg+0x81/0xc0\n   __sys_sendmsg+0x62/0xb0\n   __x64_sys_sendmsg+0x1f/0x30\n   do_syscall_64+0x3b/0xc0\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n  Modules linked in: nbd(E-)",
  "id": "GHSA-r864-6v77-6j77",
  "modified": "2025-04-14T21:32:20Z",
  "published": "2025-04-14T21:32:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49295"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06c4da89c24e7023ea448cadf8e9daf06a0aae6e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1be608e1ee1f222464b2856bda9b85ab5184a33e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d5da1ffba3388c2ae2e6c598855a4d887d3bf79"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6f505bbb8063fd3a238a4239d2d8c165e5279f6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a1435c862ea09b06be7acda325128dc08458e25"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0868f6e728c3c28bef0e8bee89d2daf86a8bbca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cbeafa7a79d08ecdb55f8f1d41a11323d0f709db"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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