GHSA-2JCW-RXCR-PWMP

Vulnerability from github – Published: 2024-07-15 09:36 – Updated: 2025-11-04 00:30
VLAI?
Details

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

tcp: avoid too many retransmit packets

If a TCP socket is using TCP_USER_TIMEOUT, and the other peer retracted its window to zero, tcp_retransmit_timer() can retransmit a packet every two jiffies (2 ms for HZ=1000), for about 4 minutes after TCP_USER_TIMEOUT has 'expired'.

The fix is to make sure tcp_rtx_probe0_timed_out() takes icsk->icsk_user_timeout into account.

Before blamed commit, the socket would not timeout after icsk->icsk_user_timeout, but would use standard exponential backoff for the retransmits.

Also worth noting that before commit e89688e3e978 ("net: tcp: fix unexcepted socket die when snd_wnd is 0"), the issue would last 2 minutes instead of 4.

Severity ?
3.3 (Low)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
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{
  "affected": [],
  "aliases": [
    "CVE-2024-41007"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-15T09:15:02Z",
    "severity": "LOW"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: avoid too many retransmit packets\n\nIf a TCP socket is using TCP_USER_TIMEOUT, and the other peer\nretracted its window to zero, tcp_retransmit_timer() can\nretransmit a packet every two jiffies (2 ms for HZ=1000),\nfor about 4 minutes after TCP_USER_TIMEOUT has \u0027expired\u0027.\n\nThe fix is to make sure tcp_rtx_probe0_timed_out() takes\nicsk-\u003eicsk_user_timeout into account.\n\nBefore blamed commit, the socket would not timeout after\nicsk-\u003eicsk_user_timeout, but would use standard exponential\nbackoff for the retransmits.\n\nAlso worth noting that before commit e89688e3e978 (\"net: tcp:\nfix unexcepted socket die when snd_wnd is 0\"), the issue\nwould last 2 minutes instead of 4.",
  "id": "GHSA-2jcw-rxcr-pwmp",
  "modified": "2025-11-04T00:30:58Z",
  "published": "2024-07-15T09:36:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-41007"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/04317a2471c2f637b4c49cbd0e9c0d04a519f570"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d7e64d70a11d988553a08239c810a658e841982"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66cb64a1d2239cd0309f9b5038b05462570a5be1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97a9063518f198ec0adb2ecb89789de342bb8283"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2346fca5bed130dc712f276ac63450201d52969"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dfcdd7f89e401d2c6616be90c76c2fac3fa98fde"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e113cddefa27bbf5a79f72387b8fbd432a61a466"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "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:L",
      "type": "CVSS_V3"
    }
  ]
}


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