{"id":"CVE-2026-74270","revision":"edde55a6a2cd4b2bb2dd5ecf2d035a21","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":[]}