GHSA-WPHV-P3GW-H29J
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-10-03 12:31In the Linux kernel, the following vulnerability has been resolved:
mptcp: avoid unneeded actions on subflow reset
Once in a blue moon, the mptcp receive path can recursively call mptcp_data_ready() via state change under unlucky error conditions, and then try to hold the data lock again.
Break the recursion loop explicitly checking for the exceptional condition.
Add a new flag instead of using an existing one like 'closing', to exit early in subflow_state_change(), and explicitly flush the RX queue at reset time.
This avoids unneeded processing to check for available data -- calling get_mapping_status() and more on a dying subflow -- but also in error reporting and worker scheduling.
Note that we must consume the currently peeked skb before invoking mptcp_dss_corruption to avoid consuming it again after the eventual reset has freed it.
{
"affected": [],
"aliases": [
"CVE-2026-97524"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:02Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: avoid unneeded actions on subflow reset\n\nOnce in a blue moon, the mptcp receive path can recursively call\nmptcp_data_ready() via state change under unlucky error conditions, and\nthen try to hold the data lock again.\n\nBreak the recursion loop explicitly checking for the exceptional\ncondition.\n\nAdd a new flag instead of using an existing one like \u0027closing\u0027, to exit\nearly in subflow_state_change(), and explicitly flush the RX queue at\nreset time.\n\nThis avoids unneeded processing to check for available data -- calling\nget_mapping_status() and more on a dying subflow -- but also in error\nreporting and worker scheduling.\n\nNote that we must consume the currently peeked skb before invoking\nmptcp_dss_corruption to avoid consuming it again after the eventual\nreset has freed it.",
"id": "GHSA-wphv-p3gw-h29j",
"modified": "2026-10-03T12:31:15Z",
"published": "2026-09-25T12:31:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97524"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1962841387087970d75ba8b8d4c2aa2d45705e50"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2b0f561f21b27c40c91ea4975268a06092bd7e9c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4b7abdcb5ba832fafab679f0d998af39cbc99307"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6d669c740933124eae3df8cfc15995af9bcc6aba"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/83a7dcdd2b1060484528da70a643125174d47e5a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a370e56024df0b07e3120c45a9773ae123819fd6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b2dbcc1ed48b5ac070a41db4a52aade6823c4df0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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