{"schema":"threatline.record/2","record":{"id":"CVE-2026-97985","aliases":[],"summary":"af_unix: Update last skb marker in manage_oob().","details":"In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Update last skb marker in manage_oob().\n\nFahad Alharbi reported that blocking recv(MSG_PEEK) could hog CPU\ndue to OOB skb.\n\nIn the following cases, manage_oob() skips OOB skb(s) and returns\nNULL for the last recv(MSG_PEEK):\n\n  socketpair(AF_UNIX, SOCK_STREAM, 0, sk);\n\n  1) skb -> OOB skb -> NULL\n     send(sk[0], \"ab\", 2, MSG_OOB);\n     recv(sk[1], buf, 0, MSG_PEEK);\n\n  2) skb -> consumed OOB skb -> NULL\n     send(sk[0], \"ab\", 2, MSG_OOB);\n     recv(sk[1], buf, 1, MSG_OOB);\n     recv(sk[1], buf, 0, MSG_PEEK);\n\n  3) consumed OOB skb -> OOB skb -> NULL\n     send(sk[0], \"a\", 1, MSG_OOB);\n     recv(sk[1], buf, 0, MSG_OOB);\n     send(sk[0], \"b\", 1, MSG_OOB);\n     recv(sk[1], buf, 1, MSG_PEEK);\n\nThen, @copied is 0 in unix_stream_read_generic() (zero-length buffer,\nor non-OOB skb is not yet consumed), and unix_stream_data_wait() is\ncalled.\n\nHowever, it returns immediately because @last is not updated in\nunix_stream_read_generic(), and the thread busy-waits for a new skb.\n\nLet's update @last in manage_oob().\n\nFor MSG_PEEK, @last is updated with the skipped OOB, and for the\nnon-peek case, @last matches the returned value (when !copied)\nbecause OOB is unlinked.\n\nNote that manage_oob() is inlined and no stack canary is added.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97985","source_modified_at":"2026-10-21T12:53:57.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"022d81a709cd553bbe2db8675f8e824f4aee6284","lessThan":"bd91dc313afe21e9d6b31ca6a47606a33ca5e35c","status":"affected","versionType":"git"},{"version":"22dd70eb2c3d754862964377a75abafd3167346b","lessThan":"0630bfc773d85ac44da05b2c5a037dbbd39301ab","status":"affected","versionType":"git"},{"version":"22dd70eb2c3d754862964377a75abafd3167346b","lessThan":"f1816b3d7ce80dcf086bb68ff5ae6e09520ca1fa","status":"affected","versionType":"git"},{"version":"22dd70eb2c3d754862964377a75abafd3167346b","lessThan":"fc62a26493a98a0424d9dae2eb92a1daa1321f65","status":"affected","versionType":"git"},{"version":"22dd70eb2c3d754862964377a75abafd3167346b","lessThan":"94fd4debd2e3a69cf93e766c8b328a810c228119","status":"affected","versionType":"git"},{"version":"ae3f9e1221b31b18dbd4c4b85d08574996bbd973","status":"affected","versionType":"git"},{"version":"ba0db4638525b8b054b3d546b45f7e473f477027","status":"affected","versionType":"git"},{"version":"16dc252e7007547a7b72a2c21022ef81fb45e6a3","status":"affected","versionType":"git"},{"version":"6.6.29","lessThan":"6.6.160","status":"affected","versionType":"semver"},{"version":"5.15.157","lessThan":"5.16","status":"affected","versionType":"semver"},{"version":"6.1.88","lessThan":"6.2","status":"affected","versionType":"semver"},{"version":"6.8.8","lessThan":"6.9","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97985","source_modified_at":"2026-10-21T12:53:57.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97985","source_modified_at":"2026-10-21T12:53:57.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0630bfc773d85ac44da05b2c5a037dbbd39301ab","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97985","source_modified_at":"2026-10-21T12:53:57.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"94fd4debd2e3a69cf93e766c8b328a810c228119","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97985","source_modified_at":"2026-10-21T12:53:57.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.6.160","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97985","source_modified_at":"2026-10-21T12:53:57.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5.16","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97985","source_modified_at":"2026-10-21T12:53:57.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97985","source_modified_at":"2026-10-21T12:53:57.548Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.9","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00168,"percentile":0.05717,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:23:20.173Z","modified_at":"2026-10-21T12:53:57.548Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97985","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:53:57.548Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97985","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/bd91dc313afe21e9d6b31ca6a47606a33ca5e35c"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0630bfc773d85ac44da05b2c5a037dbbd39301ab"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/f1816b3d7ce80dcf086bb68ff5ae6e09520ca1fa"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/fc62a26493a98a0424d9dae2eb92a1daa1321f65"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/94fd4debd2e3a69cf93e766c8b328a810c228119"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T12:53:57.548Z","content_hash":"dae75d500b43cf9243b61903b4d740082d63af4311ff7f40b60859a699e74a73"}}