GHSA-RHQC-RFXH-QJ7G
Vulnerability from github – Published: 2024-09-11 18:31 – Updated: 2025-11-04 00:31In the Linux kernel, the following vulnerability has been resolved:
mptcp: pm: only decrement add_addr_accepted for MPJ req
Adding the following warning ...
WARN_ON_ONCE(msk->pm.add_addr_accepted == 0)
... before decrementing the add_addr_accepted counter helped to find a bug when running the "remove single subflow" subtest from the mptcp_join.sh selftest.
Removing a 'subflow' endpoint will first trigger a RM_ADDR, then the subflow closure. Before this patch, and upon the reception of the RM_ADDR, the other peer will then try to decrement this add_addr_accepted. That's not correct because the attached subflows have not been created upon the reception of an ADD_ADDR.
A way to solve that is to decrement the counter only if the attached subflow was an MP_JOIN to a remote id that was not 0, and initiated by the host receiving the RM_ADDR.
{
"affected": [],
"aliases": [
"CVE-2024-45009"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-09-11T16:15:06Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: pm: only decrement add_addr_accepted for MPJ req\n\nAdding the following warning ...\n\n WARN_ON_ONCE(msk-\u003epm.add_addr_accepted == 0)\n\n... before decrementing the add_addr_accepted counter helped to find a\nbug when running the \"remove single subflow\" subtest from the\nmptcp_join.sh selftest.\n\nRemoving a \u0027subflow\u0027 endpoint will first trigger a RM_ADDR, then the\nsubflow closure. Before this patch, and upon the reception of the\nRM_ADDR, the other peer will then try to decrement this\nadd_addr_accepted. That\u0027s not correct because the attached subflows have\nnot been created upon the reception of an ADD_ADDR.\n\nA way to solve that is to decrement the counter only if the attached\nsubflow was an MP_JOIN to a remote id that was not 0, and initiated by\nthe host receiving the RM_ADDR.",
"id": "GHSA-rhqc-rfxh-qj7g",
"modified": "2025-11-04T00:31:23Z",
"published": "2024-09-11T18:31:04Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-45009"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1c1f721375989579e46741f59523e39ec9b2a9bd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2060f1efab370b496c4903b840844ecaff324c3c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/35b31f5549ede4070566b949781e83495906b43d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/85b866e4c4e63a1d7afb58f1e24273caad03d0b7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d20bf2c96d7ffd171299b32f562f70e5bf5dc608"
},
{
"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:H",
"type": "CVSS_V3"
}
]
}
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