ghsa-2jcw-rxcr-pwmp
Vulnerability from github
Published
2024-07-15 09:36
Modified
2024-07-19 18:31
Severity ?
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.
{
"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": "2024-07-19T18:31:20Z",
"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"
}
],
"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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