{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-97985", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:18:58.208Z", "datePublished": "2026-09-25T10:23:20.173Z", "dateUpdated": "2026-10-21T12:53:57.548Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:53:57.548Z" }, "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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/unix/af_unix.c" ], "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" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/unix/af_unix.c" ], "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" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.29", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.12.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.2.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.3" }, { "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": "6.8.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/bd91dc313afe21e9d6b31ca6a47606a33ca5e35c" }, { "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" } } } }