{"api_version":"1","generated_at":"2026-10-11T12:09:58+00:00","cve":"CVE-2026-98306","urls":{"html":"https://cve.report/CVE-2026-98306","api":"https://cve.report/api/cve/CVE-2026-98306.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98306","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98306"},"summary":{"title":"seg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulation\n\nWhen an SRv6 packet arrives on an interface enslaved to a VRF,\nvrf_ip6_rcv() sets IP6SKB_L3SLAVE in IP6CB, but decap_and_validate()\nhas never set IPSKB_L3SLAVE in IPCB. The bit stayed clear in the\ncommon case, and with CONFIG_IPV6_MIP6 the leftover frag_max_size of\na reassembled outer packet could even set it, with no VRF involved.\nCommit 44930446dde4 (\"ipv6: seg6: clear IPv4 control block on IPIP\ndecapsulation\") then made the unreliable bit reliably clear.\n\nThe effect of the missing flag is visible with End.DX4 when a\ndelivery to a local address of the node reaches the socket lookup.\nFor example, a UDP socket bound to the enslaved ingress interface\ndoes not receive any of the decapsulated packets, while an unbound\nsocket outside the VRF does.\nThis contradicts Documentation/networking/vrf.rst: by default the\nscope of an unbound UDP or TCP socket is limited to the default VRF.\n\nSet IPSKB_L3SLAVE for IPv4 in decap_and_validate(), which already does\nthe same for IPv6. The socket lookup then matches the decapsulated\npacket like any other packet received on that enslaved interface. Such\na packet matches an unbound UDP or TCP socket only when\nudp_l3mdev_accept or tcp_l3mdev_accept is set.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-06 09:18:21","updated_at":"2026-10-06 09:18:21"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/8c16e1ccc082a3763dfc6bc2d3f658c1a6336f9d","name":"https://git.kernel.org/stable/c/8c16e1ccc082a3763dfc6bc2d3f658c1a6336f9d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ddf60220c925b54a1714c4722fdbdb12833232d0","name":"https://git.kernel.org/stable/c/ddf60220c925b54a1714c4722fdbdb12833232d0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f8fb4738ccef5f9d107845b05734a56352747b1a","name":"https://git.kernel.org/stable/c/f8fb4738ccef5f9d107845b05734a56352747b1a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1d9f5c78903dd25a3556229eb716dd465c5f3573","name":"https://git.kernel.org/stable/c/1d9f5c78903dd25a3556229eb716dd465c5f3573","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7616242a2b37883f7322aaa1d2bd6cd0fed28315","name":"https://git.kernel.org/stable/c/7616242a2b37883f7322aaa1d2bd6cd0fed28315","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5130afa025c95faa621adf8bac525baeb2b290d2","name":"https://git.kernel.org/stable/c/5130afa025c95faa621adf8bac525baeb2b290d2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e4d7c52f15f572608374947c6c802052e1a2fc82","name":"https://git.kernel.org/stable/c/e4d7c52f15f572608374947c6c802052e1a2fc82","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/72f410616000d21a0a6ec6c93a60301b9c92e95c","name":"https://git.kernel.org/stable/c/72f410616000d21a0a6ec6c93a60301b9c92e95c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98306","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98306","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 1d9f5c78903dd25a3556229eb716dd465c5f3573 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 72f410616000d21a0a6ec6c93a60301b9c92e95c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 e4d7c52f15f572608374947c6c802052e1a2fc82 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 5130afa025c95faa621adf8bac525baeb2b290d2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 f8fb4738ccef5f9d107845b05734a56352747b1a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 ddf60220c925b54a1714c4722fdbdb12833232d0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 8c16e1ccc082a3763dfc6bc2d3f658c1a6336f9d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 7616242a2b37883f7322aaa1d2bd6cd0fed28315 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.271 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.222 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.189 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* 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 6.18.54 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.8 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc4 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"98306","cve":"CVE-2026-98306","epss":"0.001840000","percentile":"0.072970000","score_date":"2026-10-06","updated_at":"2026-10-07 00:14:55"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv6/seg6_local.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"1d9f5c78903dd25a3556229eb716dd465c5f3573","status":"affected","version":"891ef8dd2a8d14e4e73a81dcdb135b574c57f556","versionType":"git"},{"lessThan":"72f410616000d21a0a6ec6c93a60301b9c92e95c","status":"affected","version":"891ef8dd2a8d14e4e73a81dcdb135b574c57f556","versionType":"git"},{"lessThan":"e4d7c52f15f572608374947c6c802052e1a2fc82","status":"affected","version":"891ef8dd2a8d14e4e73a81dcdb135b574c57f556","versionType":"git"},{"lessThan":"5130afa025c95faa621adf8bac525baeb2b290d2","status":"affected","version":"891ef8dd2a8d14e4e73a81dcdb135b574c57f556","versionType":"git"},{"lessThan":"f8fb4738ccef5f9d107845b05734a56352747b1a","status":"affected","version":"891ef8dd2a8d14e4e73a81dcdb135b574c57f556","versionType":"git"},{"lessThan":"ddf60220c925b54a1714c4722fdbdb12833232d0","status":"affected","version":"891ef8dd2a8d14e4e73a81dcdb135b574c57f556","versionType":"git"},{"lessThan":"8c16e1ccc082a3763dfc6bc2d3f658c1a6336f9d","status":"affected","version":"891ef8dd2a8d14e4e73a81dcdb135b574c57f556","versionType":"git"},{"lessThan":"7616242a2b37883f7322aaa1d2bd6cd0fed28315","status":"affected","version":"891ef8dd2a8d14e4e73a81dcdb135b574c57f556","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv6/seg6_local.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.14"},{"lessThan":"4.14","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.271","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.222","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.189","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.54","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc4","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.271","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.222","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.189","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.54","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.8","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc4","versionStartIncluding":"4.14","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulation\n\nWhen an SRv6 packet arrives on an interface enslaved to a VRF,\nvrf_ip6_rcv() sets IP6SKB_L3SLAVE in IP6CB, but decap_and_validate()\nhas never set IPSKB_L3SLAVE in IPCB. The bit stayed clear in the\ncommon case, and with CONFIG_IPV6_MIP6 the leftover frag_max_size of\na reassembled outer packet could even set it, with no VRF involved.\nCommit 44930446dde4 (\"ipv6: seg6: clear IPv4 control block on IPIP\ndecapsulation\") then made the unreliable bit reliably clear.\n\nThe effect of the missing flag is visible with End.DX4 when a\ndelivery to a local address of the node reaches the socket lookup.\nFor example, a UDP socket bound to the enslaved ingress interface\ndoes not receive any of the decapsulated packets, while an unbound\nsocket outside the VRF does.\nThis contradicts Documentation/networking/vrf.rst: by default the\nscope of an unbound UDP or TCP socket is limited to the default VRF.\n\nSet IPSKB_L3SLAVE for IPv4 in decap_and_validate(), which already does\nthe same for IPv6. The socket lookup then matches the decapsulated\npacket like any other packet received on that enslaved interface. Such\na packet matches an unbound UDP or TCP socket only when\nudp_l3mdev_accept or tcp_l3mdev_accept is set."}],"providerMetadata":{"dateUpdated":"2026-10-06T08:46:03.001Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/1d9f5c78903dd25a3556229eb716dd465c5f3573"},{"url":"https://git.kernel.org/stable/c/72f410616000d21a0a6ec6c93a60301b9c92e95c"},{"url":"https://git.kernel.org/stable/c/e4d7c52f15f572608374947c6c802052e1a2fc82"},{"url":"https://git.kernel.org/stable/c/5130afa025c95faa621adf8bac525baeb2b290d2"},{"url":"https://git.kernel.org/stable/c/f8fb4738ccef5f9d107845b05734a56352747b1a"},{"url":"https://git.kernel.org/stable/c/ddf60220c925b54a1714c4722fdbdb12833232d0"},{"url":"https://git.kernel.org/stable/c/8c16e1ccc082a3763dfc6bc2d3f658c1a6336f9d"},{"url":"https://git.kernel.org/stable/c/7616242a2b37883f7322aaa1d2bd6cd0fed28315"}],"title":"seg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulation","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98306","datePublished":"2026-10-06T08:46:03.001Z","dateReserved":"2026-09-25T10:25:14.338Z","dateUpdated":"2026-10-06T08:46:03.001Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-06 09:18:21","lastModifiedDate":"2026-10-06 09:18:21","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98306","Ordinal":"1","Title":"seg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulatio","CVE":"CVE-2026-98306","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98306","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulation\n\nWhen an SRv6 packet arrives on an interface enslaved to a VRF,\nvrf_ip6_rcv() sets IP6SKB_L3SLAVE in IP6CB, but decap_and_validate()\nhas never set IPSKB_L3SLAVE in IPCB. The bit stayed clear in the\ncommon case, and with CONFIG_IPV6_MIP6 the leftover frag_max_size of\na reassembled outer packet could even set it, with no VRF involved.\nCommit 44930446dde4 (\"ipv6: seg6: clear IPv4 control block on IPIP\ndecapsulation\") then made the unreliable bit reliably clear.\n\nThe effect of the missing flag is visible with End.DX4 when a\ndelivery to a local address of the node reaches the socket lookup.\nFor example, a UDP socket bound to the enslaved ingress interface\ndoes not receive any of the decapsulated packets, while an unbound\nsocket outside the VRF does.\nThis contradicts Documentation/networking/vrf.rst: by default the\nscope of an unbound UDP or TCP socket is limited to the default VRF.\n\nSet IPSKB_L3SLAVE for IPv4 in decap_and_validate(), which already does\nthe same for IPv6. The socket lookup then matches the decapsulated\npacket like any other packet received on that enslaved interface. Such\na packet matches an unbound UDP or TCP socket only when\nudp_l3mdev_accept or tcp_l3mdev_accept is set.","Type":"Description","Title":"seg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulatio"}]}}}