GHSA-FCW8-Q8JR-PQ38

Vulnerability from github – Published: 2025-03-17 18:31 – Updated: 2025-03-17 18:31
VLAI?
Details

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

rxrpc: Fix listen() setting the bar too high for the prealloc rings

AF_RXRPC's listen() handler lets you set the backlog up to 32 (if you bump up the sysctl), but whilst the preallocation circular buffers have 32 slots in them, one of them has to be a dead slot because we're using CIRC_CNT().

This means that listen(rxrpc_sock, 32) will cause an oops when the socket is closed because rxrpc_service_prealloc_one() allocated one too many calls and rxrpc_discard_prealloc() won't then be able to get rid of them because it'll think the ring is empty. rxrpc_release_calls_on_socket() then tries to abort them, but oopses because call->peer isn't yet set.

Fix this by setting the maximum backlog to RXRPC_BACKLOG_MAX - 1 to match the ring capacity.

BUG: kernel NULL pointer dereference, address: 0000000000000086 ... RIP: 0010:rxrpc_send_abort_packet+0x73/0x240 [rxrpc] Call Trace: ? __wake_up_common_lock+0x7a/0x90 ? rxrpc_notify_socket+0x8e/0x140 [rxrpc] ? rxrpc_abort_call+0x4c/0x60 [rxrpc] rxrpc_release_calls_on_socket+0x107/0x1a0 [rxrpc] rxrpc_release+0xc9/0x1c0 [rxrpc] __sock_release+0x37/0xa0 sock_close+0x11/0x20 __fput+0x89/0x240 task_work_run+0x59/0x90 do_exit+0x319/0xaa0

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2022-49450"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:21Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix listen() setting the bar too high for the prealloc rings\n\nAF_RXRPC\u0027s listen() handler lets you set the backlog up to 32 (if you bump\nup the sysctl), but whilst the preallocation circular buffers have 32 slots\nin them, one of them has to be a dead slot because we\u0027re using CIRC_CNT().\n\nThis means that listen(rxrpc_sock, 32) will cause an oops when the socket\nis closed because rxrpc_service_prealloc_one() allocated one too many calls\nand rxrpc_discard_prealloc() won\u0027t then be able to get rid of them because\nit\u0027ll think the ring is empty.  rxrpc_release_calls_on_socket() then tries\nto abort them, but oopses because call-\u003epeer isn\u0027t yet set.\n\nFix this by setting the maximum backlog to RXRPC_BACKLOG_MAX - 1 to match\nthe ring capacity.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000086\n ...\n RIP: 0010:rxrpc_send_abort_packet+0x73/0x240 [rxrpc]\n Call Trace:\n  \u003cTASK\u003e\n  ? __wake_up_common_lock+0x7a/0x90\n  ? rxrpc_notify_socket+0x8e/0x140 [rxrpc]\n  ? rxrpc_abort_call+0x4c/0x60 [rxrpc]\n  rxrpc_release_calls_on_socket+0x107/0x1a0 [rxrpc]\n  rxrpc_release+0xc9/0x1c0 [rxrpc]\n  __sock_release+0x37/0xa0\n  sock_close+0x11/0x20\n  __fput+0x89/0x240\n  task_work_run+0x59/0x90\n  do_exit+0x319/0xaa0",
  "id": "GHSA-fcw8-q8jr-pq38",
  "modified": "2025-03-17T18:31:49Z",
  "published": "2025-03-17T18:31:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49450"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/369de57492c4f1a42563c5a3bd365822ca3bfc79"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a3a78b7918bdd723d8c7c9786522ca969bffcc4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b4826657d36c218e9f08e8d3223b0edce3de88f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/616f76498d5ddf26b997caf64a95cda3c8a55533"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/61fb38cfbb1d54d3dafd0c25752f684b3cd00b32"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88e22159750b0d55793302eeed8ee603f5c1a95c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91b34bf0409f43bb60453bab23c5beadd726d022"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3a9b227d5e7467b8518160ff034ea22bb9de573"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e198f1930050e3115c80b67d9249f80f98a27c67"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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