{"id":"CVE-2026-80588","title":"mptcp: reclaim forward-allocated memory on RX path errors","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: reclaim forward-allocated memory on RX path errors\n\nAfter commit 9db5b3cec4ec (\"mptcp: borrow forward memory from subflow\"),\nerrors in the receive path prior to …","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","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= a84164847b1e0a106ebc46821e5d2f9b775c9dc8 < 473f1a5ab2abc98dd9e74b95b9c23c66c47535cc","Linux >= 9db5b3cec4ec1c0cd3239689f5c8653d691a1754 < 8277f48a06d3aa1441f6d0b6998ccc0360d30ed8","Linux >= 9db5b3cec4ec1c0cd3239689f5c8653d691a1754 < 41b49a8b914ec7dcb03eae93fb27f3c464078644","Linux >= 6.18.35 < 6.18.46","Linux 6.19"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T19:18:06.349693Z"},"published":"2026-08-26","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:26:28.920Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80588","references":[{"url":"https://git.kernel.org/stable/c/473f1a5ab2abc98dd9e74b95b9c23c66c47535cc"},{"url":"https://git.kernel.org/stable/c/8277f48a06d3aa1441f6d0b6998ccc0360d30ed8"},{"url":"https://git.kernel.org/stable/c/41b49a8b914ec7dcb03eae93fb27f3c464078644"}],"tags":["cve.org"],"epss":0.00609,"epssPercentile":0.48057,"ingestedAt":"2026-10-16T19:46:24.311Z","slug":"CVE-2026-80588","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: reclaim forward-allocated memory on RX path errors\n\nAfter commit 9db5b3cec4ec (\"mptcp: borrow forward memory from subflow\"),\nerrors in the receive path prior to queueing skbs into the receive\nqueue do not trigger forward-allocated memory reclaiming.\n\nPrevent forward memory from growing unboundedly in pathological drop\nscenarios by explicitly reclaiming memory when skbs are dropped.\n\n## Affected\n\n- `Linux >= a84164847b1e0a106ebc46821e5d2f9b775c9dc8 < 473f1a5ab2abc98dd9e74b95b9c23c66c47535cc`\n- `Linux >= 9db5b3cec4ec1c0cd3239689f5c8653d691a1754 < 8277f48a06d3aa1441f6d0b6998ccc0360d30ed8`\n- `Linux >= 9db5b3cec4ec1c0cd3239689f5c8653d691a1754 < 41b49a8b914ec7dcb03eae93fb27f3c464078644`\n- `Linux >= 6.18.35 < 6.18.46`\n- `Linux 6.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}