{"api_version":"1","generated_at":"2026-10-02T12:24:53+00:00","cve":"CVE-2026-97985","urls":{"html":"https://cve.report/CVE-2026-97985","api":"https://cve.report/api/cve/CVE-2026-97985.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-97985","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-97985"},"summary":{"title":"af_unix: Update last skb marker in manage_oob().","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:26","updated_at":"2026-09-25 11:17:26"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/0630bfc773d85ac44da05b2c5a037dbbd39301ab","name":"https://git.kernel.org/stable/c/0630bfc773d85ac44da05b2c5a037dbbd39301ab","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f1816b3d7ce80dcf086bb68ff5ae6e09520ca1fa","name":"https://git.kernel.org/stable/c/f1816b3d7ce80dcf086bb68ff5ae6e09520ca1fa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/94fd4debd2e3a69cf93e766c8b328a810c228119","name":"https://git.kernel.org/stable/c/94fd4debd2e3a69cf93e766c8b328a810c228119","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fc62a26493a98a0424d9dae2eb92a1daa1321f65","name":"https://git.kernel.org/stable/c/fc62a26493a98a0424d9dae2eb92a1daa1321f65","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97985","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97985","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 22dd70eb2c3d754862964377a75abafd3167346b 0630bfc773d85ac44da05b2c5a037dbbd39301ab git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 22dd70eb2c3d754862964377a75abafd3167346b f1816b3d7ce80dcf086bb68ff5ae6e09520ca1fa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 22dd70eb2c3d754862964377a75abafd3167346b fc62a26493a98a0424d9dae2eb92a1daa1321f65 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 22dd70eb2c3d754862964377a75abafd3167346b 94fd4debd2e3a69cf93e766c8b328a810c228119 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ae3f9e1221b31b18dbd4c4b85d08574996bbd973 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ba0db4638525b8b054b3d546b45f7e473f477027 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 022d81a709cd553bbe2db8675f8e824f4aee6284 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 16dc252e7007547a7b72a2c21022ef81fb45e6a3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.157 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.88 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.29 6.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8.8 6.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"97985","cve":"CVE-2026-97985","epss":"0.001680000","percentile":"0.053960000","score_date":"2026-09-27","updated_at":"2026-09-28 00:02:24"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/unix/af_unix.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0630bfc773d85ac44da05b2c5a037dbbd39301ab","status":"affected","version":"22dd70eb2c3d754862964377a75abafd3167346b","versionType":"git"},{"lessThan":"f1816b3d7ce80dcf086bb68ff5ae6e09520ca1fa","status":"affected","version":"22dd70eb2c3d754862964377a75abafd3167346b","versionType":"git"},{"lessThan":"fc62a26493a98a0424d9dae2eb92a1daa1321f65","status":"affected","version":"22dd70eb2c3d754862964377a75abafd3167346b","versionType":"git"},{"lessThan":"94fd4debd2e3a69cf93e766c8b328a810c228119","status":"affected","version":"22dd70eb2c3d754862964377a75abafd3167346b","versionType":"git"},{"status":"affected","version":"ae3f9e1221b31b18dbd4c4b85d08574996bbd973","versionType":"git"},{"status":"affected","version":"ba0db4638525b8b054b3d546b45f7e473f477027","versionType":"git"},{"status":"affected","version":"022d81a709cd553bbe2db8675f8e824f4aee6284","versionType":"git"},{"status":"affected","version":"16dc252e7007547a7b72a2c21022ef81fb45e6a3","versionType":"git"},{"lessThan":"5.16","status":"affected","version":"5.15.157","versionType":"semver"},{"lessThan":"6.2","status":"affected","version":"6.1.88","versionType":"semver"},{"lessThan":"6.7","status":"affected","version":"6.6.29","versionType":"semver"},{"lessThan":"6.9","status":"affected","version":"6.8.8","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/unix/af_unix.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc3","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.157","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.88","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.29","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-25T10:23:20.173Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0630bfc773d85ac44da05b2c5a037dbbd39301ab"},{"url":"https://git.kernel.org/stable/c/f1816b3d7ce80dcf086bb68ff5ae6e09520ca1fa"},{"url":"https://git.kernel.org/stable/c/fc62a26493a98a0424d9dae2eb92a1daa1321f65"},{"url":"https://git.kernel.org/stable/c/94fd4debd2e3a69cf93e766c8b328a810c228119"}],"title":"af_unix: Update last skb marker in manage_oob().","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-97985","datePublished":"2026-09-25T10:23:20.173Z","dateReserved":"2026-09-25T10:18:58.208Z","dateUpdated":"2026-09-25T10:23:20.173Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:26","lastModifiedDate":"2026-09-25 11:17:26","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"97985","Ordinal":"1","Title":"af_unix: Update last skb marker in manage_oob().","CVE":"CVE-2026-97985","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"97985","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"af_unix: Update last skb marker in manage_oob()."}]}}}