{"id":"CVE-2026-97608","revision":"4d90664c43324c19b54a5d0e7b83cca8","records":[{"revision":"4d90664c43324c19b54a5d0e7b83cca8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97608","aliases":[],"title":"netfilter: nf_log: unregister loggers before per-net teardown","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_log: unregister loggers before per-net teardown\n\nnf_log_syslog and nfnetlink_log unregister their per-network namespace\noperations before unregistering their global logger backends. This\nleaves a window where a sysctl or netlink writer can rebind the still-\nregistered logger after the per-net pre-exit callback cleared the old\nselection.\n\nThe race looks like this:\n\n  CPU 0                                 CPU 1\n  ----                                  ----\n  unregister_pernet_subsys()\n    nf_log_unset(net, logger)\n      net->nf.nf_loggers[pf] = NULL\n\n                                        lock nf_log_mutex\n                                        find logger in loggers[][]\n                                        net->nf.nf_loggers[pf] = logger\n                                        unlock nf_log_mutex\n\n  nf_log_unregister(logger)\n    lock nf_log_mutex\n    loggers[pf][type] = NULL\n    unlock nf_log_mutex\n    synchronize_rcu()\n  module exit returns\n  module core frees backend memory\n\nLater, a sysctl read or packet logging operation can dereference the\nstale per-net logger pointer.\n\nFix this by unregistering the global logger backends before tearing down\nper-net state. Once the global registrations are gone, later writers can\nno longer rebind the logger. unregister_pernet_subsys() already waits\nfor an RCU grace period after the pre-exit callback clears the per-net\nselection, while nf_log_unregister() continues to cover readers of the\nglobal logger table.\n\nApply this ordering fix to both nf_log backends that combine per-net\nteardown with global logger registration.","state":0,"publishedAt":"2026-09-25T10:22:19.03+00:00","modifiedAt":"2026-10-19T09:10:12.02+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/netfilter/nf_log_syslog.c\",\n                        \"net/netfilter/nfnetlink_log.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5b023fc8d8e0997e0b7ea6506d243afd5478c96e\",\n                            \"lessThan\": \"51417230716b73f6aa1dc402b3a56d3382a694dc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5b023fc8d8e0997e0b7ea6506d243afd5478c96e\",\n                            \"lessThan\": \"b0514ca1ee6f2b708d6c602ea946acdfc6a90e24\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5b023fc8d8e0997e0b7ea6506d243afd5478c96e\",\n                            \"lessThan\": \"90166834b7dc6131aa42b6b14b8b4ed47be97079\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5b023fc8d8e0997e0b7ea6506d243afd5478c96e\",\n                            \"lessThan\": \"eaec35fae8f2052c1878a5c7cc7699d8357d79f2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5b023fc8d8e0997e0b7ea6506d243afd5478c96e\",\n                            \"lessThan\": \"64803ba0a05791cf9ca874466480e4c4cadaf7ab\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5b023fc8d8e0997e0b7ea6506d243afd5478c96e\",\n                            \"lessThan\": \"dce24f3a146948595bb1b86347f31e20b4975daa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5b023fc8d8e0997e0b7ea6506d243afd5478c96e\",\n                            \"lessThan\": \"2c018cc4842c33f0c732962e2ab58635e8ae5823\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/netfilter/nf_log_syslog.c\",\n                        \"net/netfilter/nfnetlink_log.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/51417230716b73f6aa1dc402b3a56d3382a694dc","https://git.kernel.org/stable/c/b0514ca1ee6f2b708d6c602ea946acdfc6a90e24","https://git.kernel.org/stable/c/90166834b7dc6131aa42b6b14b8b4ed47be97079","https://git.kernel.org/stable/c/eaec35fae8f2052c1878a5c7cc7699d8357d79f2","https://git.kernel.org/stable/c/64803ba0a05791cf9ca874466480e4c4cadaf7ab","https://git.kernel.org/stable/c/dce24f3a146948595bb1b86347f31e20b4975daa","https://git.kernel.org/stable/c/2c018cc4842c33f0c732962e2ab58635e8ae5823"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97608","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97608","identifiers":["CVE-2026-97608"]},"retained":false,"historicalAffected":[]}],"coverage":[]}