{"id":"CVE-2026-74624","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74624","summary":"netfilter: nf_conntrack: defer invalid log until after unlock","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack: defer invalid log until after unlock\n\nTCP and SCTP conntrack paths can emit invalid-packet logs while ct->lock\nis still held.\n\nWhen invalid logging is routed to nfnetlink_log and conntrack export is\nenabled, the log path can re-enter conntrack netlink glue and dump the\nsame conntrack again. Protocol attribute dumping may take ct->lock, so\nlogging while holding that lock can deadlock.\n\nDefer the TCP invalid logs by storing only the minimal log context while\nct->lock is held and emitting the log after unlocking. Also make the TCP\ntimeout-lowering invalid path return whether a log is needed, then emit\nthat log after unlocking.\n\nDo the same for the SCTP invalid state-transition log that can be reached\nwhile ct->lock is held.\n\nAdd a lockdep assertion to nf_ct_l4proto_log_invalid() so future callers\nthat log invalid conntracks while holding ct->lock are caught outside TCP\nand SCTP as well.","published":"2026-08-22T15:32:07.193Z","modified":"2026-08-25T03:51:47.158708877Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.1.184"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0424186d570aa4d1ad17f516afb86bd9eaa4f42e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2d19b95c9723001f214f7a47d67b09f46238f200"},{"type":"WEB","url":"https://git.kernel.org/stable/c/63853eb20bba4e00b7cd0b8cfc19337bbaaf5037"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9480fcf70a5aa9d320088a01c95df0e5e6391f4a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c0224327b7cbed9d3198e8dbec847281053dcd06"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ca97360eba4b3dc67f1804625542f4ccc774242a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74624.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74624"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-25T03:51:47.158708877Z"}}