{"id":"CVE-2026-98096","revision":"97e3783e379448f0ae9f4d8d33b89836","records":[{"revision":"97e3783e379448f0ae9f4d8d33b89836","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98096","aliases":[],"title":"ipv6: sr: restore network header before routing and forwarding","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sr: restore network header before routing and forwarding\n\nipv6_srh_rcv() runs with skb->data at the Segment Routing Header (SRH)\nwhile skb_network_header() points at the IPv6 header.\n\nWhen segments_left > 0, ipv6_srh_rcv() previously restored the skb->data\nposition by pushing sizeof(struct ipv6hdr), assuming the SRH immediately\nfollowed the fixed IPv6 header. If another extension header (such as a\nHop-by-Hop options header) precedes the SRH, skb_network_offset()\nremained negative.\n\nThis led to two problems:\n1. During ip6_route_input(), fib6_rules_early_flow_dissect() invokes\n   __skb_flow_dissect() which passes the negative skb_network_offset()\n   to flow dissection, breaking BPF and C flow dissector logic.\n2. If forwarded via ip6_forward() or redirected via act_mirred, downstream\n   handlers (like sch_fragment() or neighbour output) pass the negative\n   offset as an unsigned length, triggering OOB memcpy or buffer overflows.\n\nFix this by pushing -skb_network_offset(skb) before routing, ensuring\nskb_network_offset(skb) is 0 for route lookup / flow dissection as well as\ndownstream forwarding. On the loopback path, pull skb_transport_offset(skb)\nto restore skb->data to the SRH before looping back.","state":0,"publishedAt":"2026-09-25T10:24:27.098+00:00","modifiedAt":"2026-10-19T09:13:48.508+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/ipv6/exthdrs.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1ababeba4a21f3dba3da3523c670b207fb2feb62\",\n                            \"lessThan\": \"f463c4786cf27376de7dfc0833a12e924a98f698\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1ababeba4a21f3dba3da3523c670b207fb2feb62\",\n                            \"lessThan\": \"8f44d4160bcdb3136a9145a4b9c7816382976925\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1ababeba4a21f3dba3da3523c670b207fb2feb62\",\n                            \"lessThan\": \"9cfbe2c381ab6d00a08e7a5b6028865adfb4e1bc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1ababeba4a21f3dba3da3523c670b207fb2feb62\",\n                            \"lessThan\": \"af08f62b5a5a446d6134a92d86771d3d12e0e3da\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1ababeba4a21f3dba3da3523c670b207fb2feb62\",\n                            \"lessThan\": \"ce4c8beedc19aceeab0e7bdc6f34394fb158c47c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1ababeba4a21f3dba3da3523c670b207fb2feb62\",\n                            \"lessThan\": \"97b21ef57dfabbff660a4672c9fef7edfb720f47\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1ababeba4a21f3dba3da3523c670b207fb2feb62\",\n                            \"lessThan\": \"3ad7dca5e03bd64c65983a19734337512fd75491\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1ababeba4a21f3dba3da3523c670b207fb2feb62\",\n                            \"lessThan\": \"975b5b067f525a1b1338c4a3bee1c46545801518\",\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/ipv6/exthdrs.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\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:H/PR:N/UI:N/S:U/C:N/I:H/A:H","score":7.4,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/f463c4786cf27376de7dfc0833a12e924a98f698","https://git.kernel.org/stable/c/8f44d4160bcdb3136a9145a4b9c7816382976925","https://git.kernel.org/stable/c/9cfbe2c381ab6d00a08e7a5b6028865adfb4e1bc","https://git.kernel.org/stable/c/af08f62b5a5a446d6134a92d86771d3d12e0e3da","https://git.kernel.org/stable/c/ce4c8beedc19aceeab0e7bdc6f34394fb158c47c","https://git.kernel.org/stable/c/97b21ef57dfabbff660a4672c9fef7edfb720f47","https://git.kernel.org/stable/c/3ad7dca5e03bd64c65983a19734337512fd75491","https://git.kernel.org/stable/c/975b5b067f525a1b1338c4a3bee1c46545801518"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98096","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98096","identifiers":["CVE-2026-98096"]},"retained":false,"historicalAffected":[]}],"coverage":[]}