{"id":"CVE-2026-74270","revision":null,"records":[{"revision":"edde55a6a2cd4b2bb2dd5ecf2d035a21","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74270","aliases":[],"title":"handshake: Require admin permission for DONE command","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nhandshake: Require admin permission for DONE command\n\nACCEPT and DONE are the two downcalls of the handshake genl\nfamily, both intended for use by the trusted handshake agent\n(tlshd). ACCEPT already requires GENL_ADMIN_PERM; DONE has\nno privilege check at all.\n\nThe fd-lookup in handshake_nl_done_doit() only confirms that\nsome pending handshake request exists for the supplied sockfd;\nit does not authenticate the sender. An unprivileged process\nthat guesses or observes a valid sockfd can therefore submit\na DONE with HANDSHAKE_A_DONE_STATUS == 0, leaving the kernel\nconsumer to proceed as if the handshake succeeded. A non-zero\nstatus on a forged DONE tears down a legitimate in-flight\nhandshake before tlshd can report its real result.","state":0,"publishedAt":"2026-08-15T05:57:44.195+00:00","modifiedAt":"2026-10-16T18:55:29.298+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 \"Documentation/netlink/specs/handshake.yaml\",\n \"net/handshake/genl.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3b3009ea8abb713b022d94fba95ec270cf6e7eae\",\n \"lessThan\": \"25fb53e43ec006ac69b9e825a7e8a11d63a6083e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3b3009ea8abb713b022d94fba95ec270cf6e7eae\",\n \"lessThan\": \"b6557f912509abe8e70223373dd7a44d1d4a0d6c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3b3009ea8abb713b022d94fba95ec270cf6e7eae\",\n \"lessThan\": \"67cec2f1eb9e58719d622e92e2278ceda72dbd85\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3b3009ea8abb713b022d94fba95ec270cf6e7eae\",\n \"lessThan\": \"4dafc411948469277b276724c3b2b4408c02c04c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3b3009ea8abb713b022d94fba95ec270cf6e7eae\",\n \"lessThan\": \"81246a65303d9635266b1334490142caaf86a11f\",\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 \"Documentation/netlink/specs/handshake.yaml\",\n \"net/handshake/genl.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.4\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.4\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/25fb53e43ec006ac69b9e825a7e8a11d63a6083e","https://git.kernel.org/stable/c/b6557f912509abe8e70223373dd7a44d1d4a0d6c","https://git.kernel.org/stable/c/67cec2f1eb9e58719d622e92e2278ceda72dbd85","https://git.kernel.org/stable/c/4dafc411948469277b276724c3b2b4408c02c04c","https://git.kernel.org/stable/c/81246a65303d9635266b1334490142caaf86a11f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74270","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74270","identifiers":["CVE-2026-74270"]},"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-e2b097903e5d4f15be75e703eb2494a6","complete":false,"records":13654,"lastAttemptAt":"2026-11-09T09:08:45.0227528+00:00","lastSuccessAt":"2026-11-09T09:08:45.1163995+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:08:45.1163995+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T09:04:02.9162191+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T09:04:02.9162191+00:00","lastSuccessAt":"2026-11-09T09:04:03.197028+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:04:03.1970284+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. 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