{"id":"CVE-2026-97568","revision":"5e35c68c54c648dab8e9cc0309a8d5b1","records":[{"revision":"5e35c68c54c648dab8e9cc0309a8d5b1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97568","aliases":[],"title":"mptcp: syncookies: remember the request backup flag","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: syncookies: remember the request backup flag\n\nInstead of using an uninitialised bit when copying the info in\nsubflow_ulp_clone().\n\nTo fix this, no need to extend the join_entry structure: backup is\ncoming from struct mptcp_subflow_request_sock, only one bit. Do the same\nhere by using one bit for both.","state":0,"publishedAt":"2026-09-25T10:21:54.269+00:00","modifiedAt":"2026-10-19T09:09:31.044+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/mptcp/syncookies.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1008f2bcbc8e461c1df3aebba30ac4f616ebe570\",\n                            \"lessThan\": \"c97fa2c7ada82d4cac1c6c00643238dc4c462f15\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6f01f41b6a492ddf2da7609967cfaf57e7ca48a7\",\n                            \"lessThan\": \"1668b34452009d27be3262646de748a3e48ffd51\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"09176f80995105c62939728fbad5c437d61e7ff4\",\n                            \"lessThan\": \"b138e7dc719f0a3949de8bb6500b8cf1604eea06\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ed3e34c766e8264d5d2e0436f86c51604d6a8a7\",\n                            \"lessThan\": \"360d99258a6402cb8e49771460944f19f04d25b7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"efd340bf3d7779a3a8ec954d8ec0fb8a10f24982\",\n                            \"lessThan\": \"61178d0b85b4b1b53e78b06e89d018d22d102f88\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"efd340bf3d7779a3a8ec954d8ec0fb8a10f24982\",\n                            \"lessThan\": \"00b2bd518911e0daab00f4749cce68c191ccebb4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"efd340bf3d7779a3a8ec954d8ec0fb8a10f24982\",\n                            \"lessThan\": \"06d649f9cd03a9f8e768a658b20acf8d2c8022e0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"efd340bf3d7779a3a8ec954d8ec0fb8a10f24982\",\n                            \"lessThan\": \"b76c0e28b392620dfbaf92cdeedbf115820b44cb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"73e2baa301ee3f62ff971e68877adeb37f98cc67\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.10.224\",\n                            \"lessThan\": \"5.10.271\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.165\",\n                            \"lessThan\": \"5.15.222\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.104\",\n                            \"lessThan\": \"6.1.189\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.45\",\n                            \"lessThan\": \"6.6.158\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.10.4\",\n                            \"lessThan\": \"6.11\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/mptcp/syncookies.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/c97fa2c7ada82d4cac1c6c00643238dc4c462f15","https://git.kernel.org/stable/c/1668b34452009d27be3262646de748a3e48ffd51","https://git.kernel.org/stable/c/b138e7dc719f0a3949de8bb6500b8cf1604eea06","https://git.kernel.org/stable/c/360d99258a6402cb8e49771460944f19f04d25b7","https://git.kernel.org/stable/c/61178d0b85b4b1b53e78b06e89d018d22d102f88","https://git.kernel.org/stable/c/00b2bd518911e0daab00f4749cce68c191ccebb4","https://git.kernel.org/stable/c/06d649f9cd03a9f8e768a658b20acf8d2c8022e0","https://git.kernel.org/stable/c/b76c0e28b392620dfbaf92cdeedbf115820b44cb"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97568","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97568","identifiers":["CVE-2026-97568"]},"retained":false,"historicalAffected":[]}],"coverage":[]}