{"api_version":"1","generated_at":"2026-05-03T12:43:30+00:00","cve":"CVE-2026-43057","urls":{"html":"https://cve.report/CVE-2026-43057","api":"https://cve.report/api/cve/CVE-2026-43057.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43057","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43057"},"summary":{"title":"net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: correctly handle tunneled traffic on IPV6_CSUM GSO fallback\n\nNETIF_F_IPV6_CSUM only advertises support for checksum offload of\npackets without IPv6 extension headers. Packets with extension\nheaders must fall back onto software checksumming. Since TSO\ndepends on checksum offload, those must revert to GSO.\n\nThe below commit introduces that fallback. It always checks\nnetwork header length. For tunneled packets, the inner header length\nmust be checked instead. Extend the check accordingly.\n\nA special case is tunneled packets without inner IP protocol. Such as\nRFC 6951 SCTP in UDP. Those are not standard IPv6 followed by\ntransport header either, so also must revert to the software GSO path.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-01 15:16:52","updated_at":"2026-05-03 07:16:24"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/ed71cf465c75f5688b07a35d373cd1d6b589c8ea","name":"https://git.kernel.org/stable/c/ed71cf465c75f5688b07a35d373cd1d6b589c8ea","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a98b78116a27e2a57b696b569b2cb431c95cf9b6","name":"https://git.kernel.org/stable/c/a98b78116a27e2a57b696b569b2cb431c95cf9b6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c4336a07eb6b2526dc2b62928b5104b41a7f81f5","name":"https://git.kernel.org/stable/c/c4336a07eb6b2526dc2b62928b5104b41a7f81f5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2094a7cf91b71367b649f991aacc7b579f793d0b","name":"https://git.kernel.org/stable/c/2094a7cf91b71367b649f991aacc7b579f793d0b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/33670f780e0120c3dacda188c512bbffe0b6044c","name":"https://git.kernel.org/stable/c/33670f780e0120c3dacda188c512bbffe0b6044c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/732fdeb2987c94b439d51f5cb9addddc2fc48c42","name":"https://git.kernel.org/stable/c/732fdeb2987c94b439d51f5cb9addddc2fc48c42","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43057","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43057","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a0478d7e888028f85fa7785ea838ce0ca09398e2 2094a7cf91b71367b649f991aacc7b579f793d0b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2156d9e9f2e483c8c3906c0ea57ea312c1424235 ed71cf465c75f5688b07a35d373cd1d6b589c8ea git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 041e2f945f82fdbd6fff577b79c33469430297aa 33670f780e0120c3dacda188c512bbffe0b6044c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 864e3396976ef41de6cc7bc366276bf4e084fff2 a98b78116a27e2a57b696b569b2cb431c95cf9b6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nnet: correctly handle tunneled traffic on IPV6_CSUM GSO fallback\n\nNETIF_F_IPV6_CSUM only advertises support for checksum offload of\npackets without IPv6 extension headers. Packets with extension\nheaders must fall back onto software checksumming. Since TSO\ndepends on checksum offload, those must revert to GSO.\n\nThe below commit introduces that fallback. It always checks\nnetwork header length. For tunneled packets, the inner header length\nmust be checked instead. Extend the check accordingly.\n\nA special case is tunneled packets without inner IP protocol. Such as\nRFC 6951 SCTP in UDP. Those are not standard IPv6 followed by\ntransport header either, so also must revert to the software GSO path."}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-05-03T05:46:27.947Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2094a7cf91b71367b649f991aacc7b579f793d0b"},{"url":"https://git.kernel.org/stable/c/ed71cf465c75f5688b07a35d373cd1d6b589c8ea"},{"url":"https://git.kernel.org/stable/c/33670f780e0120c3dacda188c512bbffe0b6044c"},{"url":"https://git.kernel.org/stable/c/a98b78116a27e2a57b696b569b2cb431c95cf9b6"},{"url":"https://git.kernel.org/stable/c/732fdeb2987c94b439d51f5cb9addddc2fc48c42"},{"url":"https://git.kernel.org/stable/c/c4336a07eb6b2526dc2b62928b5104b41a7f81f5"}],"title":"net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43057","datePublished":"2026-05-01T14:15:49.551Z","dateReserved":"2026-05-01T14:12:55.981Z","dateUpdated":"2026-05-03T05:46:27.947Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-01 15:16:52","lastModifiedDate":"2026-05-03 07:16:24","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43057","Ordinal":"1","Title":"net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback","CVE":"CVE-2026-43057","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43057","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: correctly handle tunneled traffic on IPV6_CSUM GSO fallback\n\nNETIF_F_IPV6_CSUM only advertises support for checksum offload of\npackets without IPv6 extension headers. Packets with extension\nheaders must fall back onto software checksumming. Since TSO\ndepends on checksum offload, those must revert to GSO.\n\nThe below commit introduces that fallback. It always checks\nnetwork header length. For tunneled packets, the inner header length\nmust be checked instead. Extend the check accordingly.\n\nA special case is tunneled packets without inner IP protocol. Such as\nRFC 6951 SCTP in UDP. Those are not standard IPv6 followed by\ntransport header either, so also must revert to the software GSO path.","Type":"Description","Title":"net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback"}]}}}