{"api_version":"1","generated_at":"2026-10-20T23:11:51+00:00","cve":"CVE-2026-98490","urls":{"html":"https://cve.report/CVE-2026-98490","api":"https://cve.report/api/cve/CVE-2026-98490.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98490","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98490"},"summary":{"title":"net: openvswitch: conntrack: fix helper UAF due to extensions realloc","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: conntrack: fix helper UAF due to extensions realloc\n\nWhile calling the helpers, a raw pointer to the extensions area is\nwired into expectations list:\n\n  -> nf_ct_helper()\n   -> helper->help()\n    -> nf_ct_expect_related_report()\n     -> nf_ct_expect_insert()\n      -> hlist_add_head_rcu(&exp->lnode, &master_help->expectations)\n\nIn case the connection is not confirmed yet, more extensions can be\nadded afterwards with *_ext_add() calls reallocating the extension\nspace and leaving the now invalid pointer in the expectations list\nthat is later accessed while removing the expectation.\n\nMake sure that helpers are called at the end after all the other\nextensions are already added.\n\nNote that the helper rejection now leaves the mark and labels set,\nbut that's not different from how the NAT was handled before or how\nthe mark and the labels were handled on confirmation failure.  And\nthere are no atomicity guarantees provided by the API anyway.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:16:59","updated_at":"2026-10-19 10:19:00"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/5f23080a625dd7855ab91485c8d691a54a1979f0","name":"https://git.kernel.org/stable/c/5f23080a625dd7855ab91485c8d691a54a1979f0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/afcf362625190c5260530b1d6c7daa98831f6b83","name":"https://git.kernel.org/stable/c/afcf362625190c5260530b1d6c7daa98831f6b83","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1a4151e6be57b098b7a5ebfbde58585e83200cdc","name":"https://git.kernel.org/stable/c/1a4151e6be57b098b7a5ebfbde58585e83200cdc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e02a83bb0b7a203f6a22f55ad5f426765560f811","name":"https://git.kernel.org/stable/c/e02a83bb0b7a203f6a22f55ad5f426765560f811","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98490","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98490","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cae3a2627520c3795b54533c5328b77af3405dbe afcf362625190c5260530b1d6c7daa98831f6b83 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cae3a2627520c3795b54533c5328b77af3405dbe 5f23080a625dd7855ab91485c8d691a54a1979f0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cae3a2627520c3795b54533c5328b77af3405dbe e02a83bb0b7a203f6a22f55ad5f426765560f811 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cae3a2627520c3795b54533c5328b77af3405dbe 1a4151e6be57b098b7a5ebfbde58585e83200cdc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.3","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.55 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.9 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/openvswitch/conntrack.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"afcf362625190c5260530b1d6c7daa98831f6b83","status":"affected","version":"cae3a2627520c3795b54533c5328b77af3405dbe","versionType":"git"},{"lessThan":"5f23080a625dd7855ab91485c8d691a54a1979f0","status":"affected","version":"cae3a2627520c3795b54533c5328b77af3405dbe","versionType":"git"},{"lessThan":"e02a83bb0b7a203f6a22f55ad5f426765560f811","status":"affected","version":"cae3a2627520c3795b54533c5328b77af3405dbe","versionType":"git"},{"lessThan":"1a4151e6be57b098b7a5ebfbde58585e83200cdc","status":"affected","version":"cae3a2627520c3795b54533c5328b77af3405dbe","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/openvswitch/conntrack.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.3"},{"lessThan":"4.3","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.55","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"4.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.55","versionStartIncluding":"4.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.9","versionStartIncluding":"4.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"4.3","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: conntrack: fix helper UAF due to extensions realloc\n\nWhile calling the helpers, a raw pointer to the extensions area is\nwired into expectations list:\n\n  -> nf_ct_helper()\n   -> helper->help()\n    -> nf_ct_expect_related_report()\n     -> nf_ct_expect_insert()\n      -> hlist_add_head_rcu(&exp->lnode, &master_help->expectations)\n\nIn case the connection is not confirmed yet, more extensions can be\nadded afterwards with *_ext_add() calls reallocating the extension\nspace and leaving the now invalid pointer in the expectations list\nthat is later accessed while removing the expectation.\n\nMake sure that helpers are called at the end after all the other\nextensions are already added.\n\nNote that the helper rejection now leaves the mark and labels set,\nbut that's not different from how the NAT was handled before or how\nthe mark and the labels were handled on confirmation failure.  And\nthere are no atomicity guarantees provided by the API anyway."}],"providerMetadata":{"dateUpdated":"2026-10-19T09:20:27.422Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/afcf362625190c5260530b1d6c7daa98831f6b83"},{"url":"https://git.kernel.org/stable/c/5f23080a625dd7855ab91485c8d691a54a1979f0"},{"url":"https://git.kernel.org/stable/c/e02a83bb0b7a203f6a22f55ad5f426765560f811"},{"url":"https://git.kernel.org/stable/c/1a4151e6be57b098b7a5ebfbde58585e83200cdc"}],"title":"net: openvswitch: conntrack: fix helper UAF due to extensions realloc","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98490","datePublished":"2026-10-18T15:16:19.215Z","dateReserved":"2026-09-25T10:25:14.352Z","dateUpdated":"2026-10-19T09:20:27.422Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:16:59","lastModifiedDate":"2026-10-19 10:19:00","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98490","Ordinal":"1","Title":"net: openvswitch: conntrack: fix helper UAF due to extensions re","CVE":"CVE-2026-98490","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98490","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: conntrack: fix helper UAF due to extensions realloc\n\nWhile calling the helpers, a raw pointer to the extensions area is\nwired into expectations list:\n\n  -> nf_ct_helper()\n   -> helper->help()\n    -> nf_ct_expect_related_report()\n     -> nf_ct_expect_insert()\n      -> hlist_add_head_rcu(&exp->lnode, &master_help->expectations)\n\nIn case the connection is not confirmed yet, more extensions can be\nadded afterwards with *_ext_add() calls reallocating the extension\nspace and leaving the now invalid pointer in the expectations list\nthat is later accessed while removing the expectation.\n\nMake sure that helpers are called at the end after all the other\nextensions are already added.\n\nNote that the helper rejection now leaves the mark and labels set,\nbut that's not different from how the NAT was handled before or how\nthe mark and the labels were handled on confirmation failure.  And\nthere are no atomicity guarantees provided by the API anyway.","Type":"Description","Title":"net: openvswitch: conntrack: fix helper UAF due to extensions re"}]}}}