{"id":"CVE-2026-98438","revision":null,"records":[{"revision":"2ec87f086f3446efad901548217ddb5a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98438","aliases":[],"title":"mptcp: options: fix uninit-value in mptcp_write_data_fin","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: options: fix uninit-value in mptcp_write_data_fin\n\nWhen sending a DATA_FIN without data, and because the DATA_FIN occupies\n1 octet of the connection-level sequence space [1], it is then required\nto add a DSS mapping with specific values.\n\nIf the checksum has been negotiated, it also needs to be computed, and\nincluded in the outgoing packet, and thus the initial csum data needs to\nbe reset to 0 as well. This is no longer the case since commit\ncfcceb7a39fc (\"tcp: shrink per-packet memset in __tcp_transmit_skb()\"),\nbecause the whole ext_copy structure is no longer zeroed by default.\n\nThis seems to be the only case where use_map is changed and set\nafterwards, so initialising the csum field only in this case, along with\nother fields for this specific case.","state":0,"publishedAt":"2026-10-18T14:45:27.288+00:00","modifiedAt":"2026-10-19T09:19:34.132+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/options.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"cfcceb7a39fc10a6f896af8229bf81d96acb22cc\",\n                            \"lessThan\": \"9a682067dd7b9dce6b94a0a05661dcc921446402\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cfcceb7a39fc10a6f896af8229bf81d96acb22cc\",\n                            \"lessThan\": \"b110f1dd6cb6a9930503354a01a315e0a821eaa7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\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/options.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"7.1\",\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/9a682067dd7b9dce6b94a0a05661dcc921446402","https://git.kernel.org/stable/c/b110f1dd6cb6a9930503354a01a315e0a821eaa7"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98438","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98438","identifiers":["CVE-2026-98438"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-f237dc1707364963bb107ea6f7331307","complete":false,"records":13654,"lastAttemptAt":"2026-11-09T00:14:09.8878175+00:00","lastSuccessAt":"2026-11-09T00:14:09.883+00:00","error":null,"lastVerifiedAt":"2026-11-09T00:14:09.883+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13624,"expectedIdentifiers":13706,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T00:02:23.6066046+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T00:02:23.6066046+00:00","lastSuccessAt":"2026-11-09T00:02:23.7665616+00:00","error":null,"lastVerifiedAt":"2026-11-09T00:02:23.7665617+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-47b506589c26469684507bfb31b90a8d","complete":true,"records":13666,"lastAttemptAt":"2026-11-09T00:02:25.3547919+00:00","lastSuccessAt":"2026-11-09T00:02:25.351+00:00","error":null,"lastVerifiedAt":"2026-11-09T00:02:25.351+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13706,"expectedIdentifiers":13706,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-980593e6977a6d1b4fb1eed5a1ffe88a468736f89f0a06f710924ad59132c023","complete":true,"records":9914,"lastAttemptAt":"2026-11-09T00:02:16.0496746+00:00","lastSuccessAt":"2026-11-08T11:07:07.068788+00:00","error":null,"lastVerifiedAt":"2026-11-09T00:02:16.0496746+00:00","snapshotPublishedAt":"2026-11-08T11:02:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-09T00:02:15.8362171+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-09T00:02:15.8362171+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-3b1150af6d7ada2c07356cbab4ead5224c1485027890f71c71d0742cddf0b9e8","complete":true,"records":3055,"lastAttemptAt":"2026-11-09T00:02:23.5770506+00:00","lastSuccessAt":"2026-11-09T00:02:23.4330288+00:00","error":null,"lastVerifiedAt":"2026-11-09T00:02:23.5770506+00:00","snapshotPublishedAt":"2026-11-08T23:17:54+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-f8647d7ba64b1ba0dfdc7130944766d5b36d5b77d18fff0c79e651a4cff3c2b9","complete":true,"records":231293,"lastAttemptAt":"2026-11-09T00:02:15.9369765+00:00","lastSuccessAt":"2026-11-08T11:06:56.2918717+00:00","error":null,"lastVerifiedAt":"2026-11-09T00:02:15.9369765+00:00","snapshotPublishedAt":"2026-11-08T11:02:50+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}