{"id":"CVE-2026-31414","revision":"4b68d9f784d445b0914499686d78c9fe","records":[{"revision":"4b68d9f784d445b0914499686d78c9fe","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31414","aliases":[],"title":"netfilter: nf_conntrack_expect: use expect->helper","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_expect: use expect->helper\n\nUse expect->helper in ctnetlink and /proc to dump the helper name.\nUsing nfct_help() without holding a reference to the master conntrack\nis unsafe.\n\nUse exp->master->helper in ctnetlink path if userspace does not provide\nan explicit helper when creating an expectation to retain the existing\nbehaviour. The ctnetlink expectation path holds the reference on the\nmaster conntrack and nf_conntrack_expect lock and the nfnetlink glue\npath refers to the master ct that is attached to the skb.","state":0,"publishedAt":"2026-04-13T13:21:02.592+00:00","modifiedAt":"2026-10-19T18:35:47.389+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_conntrack_expect.c\",\n                        \"net/netfilter/nf_conntrack_helper.c\",\n                        \"net/netfilter/nf_conntrack_netlink.c\",\n                        \"net/netfilter/nf_conntrack_sip.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ea781f197d6a835cbb93a0bf88ee1696296ed8aa\",\n                            \"lessThan\": \"847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ea781f197d6a835cbb93a0bf88ee1696296ed8aa\",\n                            \"lessThan\": \"e7ccaa0a62a8ff2be5d521299ce79390c318d306\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ea781f197d6a835cbb93a0bf88ee1696296ed8aa\",\n                            \"lessThan\": \"4bd1b3d839172724b33d8d02c5a4ff6a1c775417\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ea781f197d6a835cbb93a0bf88ee1696296ed8aa\",\n                            \"lessThan\": \"b53294bff19e56ada2f230ceb8b1ffde61cc3817\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ea781f197d6a835cbb93a0bf88ee1696296ed8aa\",\n                            \"lessThan\": \"3dfd3f7712b5a800f2ba632179e9b738076a51f0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ea781f197d6a835cbb93a0bf88ee1696296ed8aa\",\n                            \"lessThan\": \"f01794106042ee27e54af6fdf5b319a2fe3df94d\",\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_conntrack_expect.c\",\n                        \"net/netfilter/nf_conntrack_helper.c\",\n                        \"net/netfilter/nf_conntrack_netlink.c\",\n                        \"net/netfilter/nf_conntrack_sip.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.30\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.30\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.168\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.134\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.81\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.22\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.12\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781","https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306","https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417","https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817","https://git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0","https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31414","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31414","identifiers":["CVE-2026-31414"]},"retained":false,"historicalAffected":[]}],"coverage":[]}