{"id":"CVE-2026-63979","revision":null,"records":[{"revision":"b89cca39dfae4b1ab49398564965cd9f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63979","aliases":[],"title":"net/handshake: hand off the pinned file reference to accept_doit","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/handshake: hand off the pinned file reference to accept_doit\n\nhandshake_req_next() removes the request from the per-net\npending list and drops hn_lock before handshake_nl_accept_doit()\nreads req->hr_sk->sk_socket and dereferences sock->file (once in\nFD_PREPARE() and again in get_file()). In that window a\nconsumer running tls_handshake_cancel() followed by sockfd_put()\n(svc_sock_free) or __fput_sync() (xs_reset_transport) releases\nsock->file. sock_release() then runs sock_orphan(), zeroing\nsk_socket, and frees the struct socket. The accept-side code\neither reads NULL through sk_socket or chases freed memory.\n\nThe submit-side sock_hold() does not prevent this. sk_refcnt\nprotects struct sock, but struct socket and sock->file are\nindependently refcounted via the file descriptor the consumer\nowns. Pinning sk leaves sock and sock->file unprotected.\n\nRetarget the accept-side dereferences at req->hr_file, which was\npinned at submit time, instead of req->hr_sk->sk_socket->file.\nPinning on its own is not sufficient: a consumer that cancels\nbetween handshake_req_next() returning and accept_doit reaching\nFD_PREPARE() takes the !remove_pending() branch in\nhandshake_req_cancel() and drops hr_file before the accept side\ntakes its own reference. Hand off an additional file reference\ninside handshake_req_next(), under hn_lock, so the accept side\noperates on a reference that no concurrent handshake_req_cancel()\ncan revoke. FD_PREPARE() consumes that handed-off reference,\neither by transferring it to the new fd in fd_publish() or by\ndropping it in the cleanup destructor on error; the explicit\nget_file() that previously balanced FD_PREPARE() is therefore\nredundant and goes away.\n\nUpdate handshake_req_cancel_test2 and _test3 to simulate the\nFD_PREPARE() consumption with an fput() so the kunit file-count\nassertions stay balanced.","state":0,"publishedAt":"2026-07-19T14:56:03.177+00:00","modifiedAt":"2026-10-21T12:42:50.338+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/handshake/handshake-test.c\",\n \"net/handshake/netlink.c\",\n \"net/handshake/request.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3b3009ea8abb713b022d94fba95ec270cf6e7eae\",\n \"lessThan\": \"b869e3e4ce1996df23b3efdbbe9a64c4ab81d745\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3b3009ea8abb713b022d94fba95ec270cf6e7eae\",\n \"lessThan\": \"2f28dbb30b88eafab8d49aaec94710b4e12dea8e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3b3009ea8abb713b022d94fba95ec270cf6e7eae\",\n \"lessThan\": \"68eba6519cbd6359fb554a9720f3a3b6b2eba23f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3b3009ea8abb713b022d94fba95ec270cf6e7eae\",\n \"lessThan\": \"c06876d4fac38f35820946ee3b1be7d7da799cd4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3b3009ea8abb713b022d94fba95ec270cf6e7eae\",\n \"lessThan\": \"f4251190e58b209999c1ba9e6d2976136a1be055\",\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/handshake/handshake-test.c\",\n \"net/handshake/netlink.c\",\n \"net/handshake/request.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\": \"6.6.160\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.114\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.44\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.12\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/b869e3e4ce1996df23b3efdbbe9a64c4ab81d745","https://git.kernel.org/stable/c/2f28dbb30b88eafab8d49aaec94710b4e12dea8e","https://git.kernel.org/stable/c/68eba6519cbd6359fb554a9720f3a3b6b2eba23f","https://git.kernel.org/stable/c/c06876d4fac38f35820946ee3b1be7d7da799cd4","https://git.kernel.org/stable/c/f4251190e58b209999c1ba9e6d2976136a1be055"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63979","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63979","identifiers":["CVE-2026-63979"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-08T10:04:32.7352320+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-08T10:04:32.735232+00:00","lastSuccessAt":"2026-11-08T10:04:32.956954+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:32.9569616+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-eaa64dac63caa79c8d4905619258c41c51b39e461b996124e1a21b5e85e7e738-e58a079eb6f76d5949b871c295ad9e8f78e928765ff9950581a38d46375b9852","complete":true,"records":421096,"lastAttemptAt":"2026-11-08T10:04:32.1680283+00:00","lastSuccessAt":"2026-11-08T07:59:14.3145447+00:00","error":"HttpRequestException","lastVerifiedAt":"2026-11-08T07:59:14.338564+00:00","snapshotPublishedAt":"2026-11-08T07:27:32+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. 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-ce0df89a405747cda5b7c61ae0b48fb2","complete":true,"records":13633,"lastAttemptAt":"2026-11-08T10:04:58.8018093+00:00","lastSuccessAt":"2026-11-08T05:08:40.263+00:00","error":null,"lastVerifiedAt":"2026-11-08T05:08:40.263+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"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":"2026-11-08T10:04:32.7352320+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-08T10:04:32.735232+00:00","lastSuccessAt":"2026-11-08T10:04:32.958305+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:32.9583056+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-2ca35de6f6b748bea5c32f6d843eca15","complete":true,"records":13645,"lastAttemptAt":"2026-11-08T10:04:58.1666994+00:00","lastSuccessAt":"2026-11-08T10:04:58.163+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:58.163+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"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-0eb4d6dde62dffacd040ad992d4fd5a65cd7d0dc5f5f4cfa8b41967fc6f9ca5f","complete":true,"records":9914,"lastAttemptAt":"2026-11-08T10:04:32.5160062+00:00","lastSuccessAt":"2026-11-06T20:10:36.6450506+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:32.5160062+00:00","snapshotPublishedAt":"2026-11-06T20:02:57+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":"2026-11-08T10:04:32.3168711+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:32.3168711+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-335633e78a15c9cde10a6025895b5617717087fb945489ae7e15d377bacf34a9","complete":true,"records":3055,"lastAttemptAt":"2026-11-08T10:04:32.6972338+00:00","lastSuccessAt":"2026-11-06T16:03:00.7615789+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:32.6972338+00:00","snapshotPublishedAt":"2026-11-06T16:02:48+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-8efbf882841c7fda0cba0c3b55677f4781f461b96ab83577ad2701c4eaf88b1e","complete":true,"records":231293,"lastAttemptAt":"2026-11-08T10:04:32.4139557+00:00","lastSuccessAt":"2026-11-08T08:01:14.837451+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:32.4139557+00:00","snapshotPublishedAt":"2026-11-08T07:33:16+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}