{"id":"CVE-2026-97524","title":"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…","summary":"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…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-764"],"vendor":"Linux","product":"Linux","affected":["Linux >= fde99e972b8f88cebe619241d7aa43d288ef666a < 6d669c740933124eae3df8cfc15995af9bcc6aba","Linux >= 12c1676d598e3b8dd92a033b623b792cc2ea1ec5 < 83a7dcdd2b1060484528da70a643125174d47e5a","Linux >= 35668f8ec84f6c944676e48ecc6bbc5fc8e6fe25 < a370e56024df0b07e3120c45a9773ae123819fd6","Linux >= b8be15d1ae7ea4eedd547c3b3141f592fbddcd30 < 1962841387087970d75ba8b8d4c2aa2d45705e50","Linux >= e32d262c89e2b22cb0640223f953b548617ed8a6 < 4b7abdcb5ba832fafab679f0d998af39cbc99307","Linux >= e32d262c89e2b22cb0640223f953b548617ed8a6 < b2dbcc1ed48b5ac070a41db4a52aade6823c4df0","Linux >= e32d262c89e2b22cb0640223f953b548617ed8a6 < ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f","Linux >= e32d262c89e2b22cb0640223f953b548617ed8a6 < 2b0f561f21b27c40c91ea4975268a06092bd7e9c","Linux 8bfd391bde685df7289b928ce8876a3583be4bfb","Linux >= 5.10.228 < 5.10.271","Linux >= 5.15.169 < 5.15.222","Linux >= 6.1.113 < 6.1.189","Linux >= 6.6.57 < 6.6.158","Linux >= 6.11.4 < 6.12","Linux 6.12"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:01.307","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97524","references":[{"url":"https://git.kernel.org/stable/c/1962841387087970d75ba8b8d4c2aa2d45705e50","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2b0f561f21b27c40c91ea4975268a06092bd7e9c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4b7abdcb5ba832fafab679f0d998af39cbc99307","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6d669c740933124eae3df8cfc15995af9bcc6aba","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/83a7dcdd2b1060484528da70a643125174d47e5a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a370e56024df0b07e3120c45a9773ae123819fd6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b2dbcc1ed48b5ac070a41db4a52aade6823c4df0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97524.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-97524"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541186"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97524"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97524"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97524.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00725,"epssPercentile":0.53883,"scores":{"nvd":7.5,"vendor":7,"cna":7.5},"ingestedAt":"2026-09-25T11:06:38.927Z","slug":"CVE-2026-97524","body":"## Overview\n\nIn 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 'closing', 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-28 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97524.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":211014,"id":"CVE-2026-97524","ts":1790349124106,"field":"cvss","old":null,"new":"7.5"},{"seq":211013,"id":"CVE-2026-97524","ts":1790349124106,"field":"severity","old":"none","new":"high"}]}