{"id":"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-\u003elock\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-\u003elock, so\nlogging while holding that lock can deadlock.\n\nDefer the TCP invalid logs by storing only the minimal log context while\nct-\u003elock 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-\u003elock is held.\n\nAdd a lockdep assertion to nf_ct_l4proto_log_invalid() so future callers\nthat log invalid conntracks while holding ct-\u003elock are caught outside TCP\nand SCTP as well.","modified":"2026-08-27T11:31:04.974693945Z","published":"2026-08-22T15:32:07.193Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74624.json","cna_assigner":"Linux"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d9a6f0d0df1899ff9086a57abc600e414f4b8cdd"},{"fixed":"ca97360eba4b3dc67f1804625542f4ccc774242a"},{"fixed":"63853eb20bba4e00b7cd0b8cfc19337bbaaf5037"},{"fixed":"9480fcf70a5aa9d320088a01c95df0e5e6391f4a"},{"fixed":"0424186d570aa4d1ad17f516afb86bd9eaa4f42e"},{"fixed":"c0224327b7cbed9d3198e8dbec847281053dcd06"},{"fixed":"2d19b95c9723001f214f7a47d67b09f46238f200"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74624.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.1.0"},{"fixed":"6.1.184"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.152"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74624.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}