{"id":"CVE-2026-97985","title":"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(…","summary":"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(…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 22dd70eb2c3d754862964377a75abafd3167346b < 0630bfc773d85ac44da05b2c5a037dbbd39301ab","Linux >= 22dd70eb2c3d754862964377a75abafd3167346b < f1816b3d7ce80dcf086bb68ff5ae6e09520ca1fa","Linux >= 22dd70eb2c3d754862964377a75abafd3167346b < fc62a26493a98a0424d9dae2eb92a1daa1321f65","Linux >= 22dd70eb2c3d754862964377a75abafd3167346b < 94fd4debd2e3a69cf93e766c8b328a810c228119","Linux ae3f9e1221b31b18dbd4c4b85d08574996bbd973","Linux ba0db4638525b8b054b3d546b45f7e473f477027","Linux 022d81a709cd553bbe2db8675f8e824f4aee6284","Linux 16dc252e7007547a7b72a2c21022ef81fb45e6a3","Linux >= 5.15.157 < 5.16","Linux >= 6.1.88 < 6.2","Linux >= 6.6.29 < 6.7","Linux >= 6.8.8 < 6.9","Linux 6.9"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T11:17:26.560","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97985","references":[{"url":"https://git.kernel.org/stable/c/0630bfc773d85ac44da05b2c5a037dbbd39301ab","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/94fd4debd2e3a69cf93e766c8b328a810c228119","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f1816b3d7ce80dcf086bb68ff5ae6e09520ca1fa","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fc62a26493a98a0424d9dae2eb92a1daa1321f65","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.868Z","slug":"CVE-2026-97985","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}