{"api_version":"1","generated_at":"2026-05-03T12:43:30+00:00","cve":"CVE-2026-43025","urls":{"html":"https://cve.report/CVE-2026-43025","api":"https://cve.report/api/cve/CVE-2026-43025.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43025","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43025"},"summary":{"title":"netfilter: ctnetlink: ignore explicit helper on new expectations","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ctnetlink: ignore explicit helper on new expectations\n\nUse the existing master conntrack helper, anything else is not really\nsupported and it just makes validation more complicated, so just ignore\nwhat helper userspace suggests for this expectation.\n\nThis was uncovered when validating CTA_EXPECT_CLASS via different helper\nprovided by userspace than the existing master conntrack helper:\n\n  BUG: KASAN: slab-out-of-bounds in nf_ct_expect_related_report+0x2479/0x27c0\n  Read of size 4 at addr ffff8880043fe408 by task poc/102\n  Call Trace:\n   nf_ct_expect_related_report+0x2479/0x27c0\n   ctnetlink_create_expect+0x22b/0x3b0\n   ctnetlink_new_expect+0x4bd/0x5c0\n   nfnetlink_rcv_msg+0x67a/0x950\n   netlink_rcv_skb+0x120/0x350\n\nAllowing to read kernel memory bytes off the expectation boundary.\n\nCTA_EXPECT_HELP_NAME is still used to offer the helper name to userspace\nvia netlink dump.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-01 15:16:46","updated_at":"2026-05-03 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43025","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd0779370588386e4a67ba5d0b176cfded8e6a53 e135f8e8212cbed12a03ab8dec77fa1247139897 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd0779370588386e4a67ba5d0b176cfded8e6a53 2ea0f35f235f70c133ad61fe05ba013753b978c6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd0779370588386e4a67ba5d0b176cfded8e6a53 0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd0779370588386e4a67ba5d0b176cfded8e6a53 187b6ec5229ea93cb04c4f6d3b52efc80f513d0d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd0779370588386e4a67ba5d0b176cfded8e6a53 21a04c31db4057deec85fcd6cc63d720b38819c3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bd0779370588386e4a67ba5d0b176cfded8e6a53 917b61fa2042f11e2af4c428e43f08199586633a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.12","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.168 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.134 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.81 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.22 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.12 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"43025","cve":"CVE-2026-43025","epss":"0.000240000","percentile":"0.068220000","score_date":"2026-05-02","updated_at":"2026-05-03 00:00:23"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/nf_conntrack_netlink.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e135f8e8212cbed12a03ab8dec77fa1247139897","status":"affected","version":"bd0779370588386e4a67ba5d0b176cfded8e6a53","versionType":"git"},{"lessThan":"2ea0f35f235f70c133ad61fe05ba013753b978c6","status":"affected","version":"bd0779370588386e4a67ba5d0b176cfded8e6a53","versionType":"git"},{"lessThan":"0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd","status":"affected","version":"bd0779370588386e4a67ba5d0b176cfded8e6a53","versionType":"git"},{"lessThan":"187b6ec5229ea93cb04c4f6d3b52efc80f513d0d","status":"affected","version":"bd0779370588386e4a67ba5d0b176cfded8e6a53","versionType":"git"},{"lessThan":"21a04c31db4057deec85fcd6cc63d720b38819c3","status":"affected","version":"bd0779370588386e4a67ba5d0b176cfded8e6a53","versionType":"git"},{"lessThan":"917b61fa2042f11e2af4c428e43f08199586633a","status":"affected","version":"bd0779370588386e4a67ba5d0b176cfded8e6a53","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/nf_conntrack_netlink.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.12"},{"lessThan":"3.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.168","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.134","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.81","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.22","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.168","versionStartIncluding":"3.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.134","versionStartIncluding":"3.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.81","versionStartIncluding":"3.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.22","versionStartIncluding":"3.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.12","versionStartIncluding":"3.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"3.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ctnetlink: ignore explicit helper on new expectations\n\nUse the existing master conntrack helper, anything else is not really\nsupported and it just makes validation more complicated, so just ignore\nwhat helper userspace suggests for this expectation.\n\nThis was uncovered when validating CTA_EXPECT_CLASS via different helper\nprovided by userspace than the existing master conntrack helper:\n\n  BUG: KASAN: slab-out-of-bounds in nf_ct_expect_related_report+0x2479/0x27c0\n  Read of size 4 at addr ffff8880043fe408 by task poc/102\n  Call Trace:\n   nf_ct_expect_related_report+0x2479/0x27c0\n   ctnetlink_create_expect+0x22b/0x3b0\n   ctnetlink_new_expect+0x4bd/0x5c0\n   nfnetlink_rcv_msg+0x67a/0x950\n   netlink_rcv_skb+0x120/0x350\n\nAllowing to read kernel memory bytes off the expectation boundary.\n\nCTA_EXPECT_HELP_NAME is still used to offer the helper name to userspace\nvia netlink dump."}],"metrics":[{"cvssV3_1":{"baseScore":7.3,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-05-03T05:46:09.287Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e135f8e8212cbed12a03ab8dec77fa1247139897"},{"url":"https://git.kernel.org/stable/c/2ea0f35f235f70c133ad61fe05ba013753b978c6"},{"url":"https://git.kernel.org/stable/c/0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd"},{"url":"https://git.kernel.org/stable/c/187b6ec5229ea93cb04c4f6d3b52efc80f513d0d"},{"url":"https://git.kernel.org/stable/c/21a04c31db4057deec85fcd6cc63d720b38819c3"},{"url":"https://git.kernel.org/stable/c/917b61fa2042f11e2af4c428e43f08199586633a"}],"title":"netfilter: ctnetlink: ignore explicit helper on new expectations","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43025","datePublished":"2026-05-01T14:15:27.103Z","dateReserved":"2026-05-01T14:12:55.976Z","dateUpdated":"2026-05-03T05:46:09.287Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-01 15:16:46","lastModifiedDate":"2026-05-03 07:16:22","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H","baseScore":7.3,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.5}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43025","Ordinal":"1","Title":"netfilter: ctnetlink: ignore explicit helper on new expectations","CVE":"CVE-2026-43025","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43025","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ctnetlink: ignore explicit helper on new expectations\n\nUse the existing master conntrack helper, anything else is not really\nsupported and it just makes validation more complicated, so just ignore\nwhat helper userspace suggests for this expectation.\n\nThis was uncovered when validating CTA_EXPECT_CLASS via different helper\nprovided by userspace than the existing master conntrack helper:\n\n  BUG: KASAN: slab-out-of-bounds in nf_ct_expect_related_report+0x2479/0x27c0\n  Read of size 4 at addr ffff8880043fe408 by task poc/102\n  Call Trace:\n   nf_ct_expect_related_report+0x2479/0x27c0\n   ctnetlink_create_expect+0x22b/0x3b0\n   ctnetlink_new_expect+0x4bd/0x5c0\n   nfnetlink_rcv_msg+0x67a/0x950\n   netlink_rcv_skb+0x120/0x350\n\nAllowing to read kernel memory bytes off the expectation boundary.\n\nCTA_EXPECT_HELP_NAME is still used to offer the helper name to userspace\nvia netlink dump.","Type":"Description","Title":"netfilter: ctnetlink: ignore explicit helper on new expectations"}]}}}