{"id":"CVE-2023-54085","title":"mptcp: fix NULL pointer dereference on fastopen early fallback","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix NULL pointer dereference on fastopen early fallback\n\nIn case of early fallback to TCP, subflow_syn_recv_sock() deletes\nthe subflow context before returning t…","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 >= 36b122baf6a8bd46b4a591f12f4ed17b22257408 < 95135835519b0ab931c39908b2c99e9fb3c9068b","Linux >= 36b122baf6a8bd46b4a591f12f4ed17b22257408 < c0ff6f6da66a7791a32c0234388b1bdc00244917","Linux 6.2"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-15T21:38:15.912200Z"},"published":"2025-12-24","updated":"2026-10-15","sourceUpdated":"2026-10-15T21:41:39.088Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-54085","references":[{"url":"https://git.kernel.org/stable/c/95135835519b0ab931c39908b2c99e9fb3c9068b"},{"url":"https://git.kernel.org/stable/c/c0ff6f6da66a7791a32c0234388b1bdc00244917"}],"tags":["cve.org"],"epss":0.0043,"epssPercentile":0.35652,"ingestedAt":"2026-10-15T22:48:25.428Z","slug":"CVE-2023-54085","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix NULL pointer dereference on fastopen early fallback\n\nIn case of early fallback to TCP, subflow_syn_recv_sock() deletes\nthe subflow context before returning the newly allocated sock to\nthe caller.\n\nThe fastopen path does not cope with the above unconditionally\ndereferencing the subflow context.\n\n## Affected\n\n- `Linux >= 36b122baf6a8bd46b4a591f12f4ed17b22257408 < 95135835519b0ab931c39908b2c99e9fb3c9068b`\n- `Linux >= 36b122baf6a8bd46b4a591f12f4ed17b22257408 < c0ff6f6da66a7791a32c0234388b1bdc00244917`\n- `Linux 6.2`\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":[]}