{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98096",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98096"
  ],
  "published": "2026-09-25T10:24:31Z",
  "summary": "ipv6: sr: restore network header before routing and forwarding",
  "details": "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98096"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f463c4786cf27376de7dfc0833a12e924a98f698"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8f44d4160bcdb3136a9145a4b9c7816382976925"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9cfbe2c381ab6d00a08e7a5b6028865adfb4e1bc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/af08f62b5a5a446d6134a92d86771d3d12e0e3da"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ce4c8beedc19aceeab0e7bdc6f34394fb158c47c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/97b21ef57dfabbff660a4672c9fef7edfb720f47"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3ad7dca5e03bd64c65983a19734337512fd75491"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/975b5b067f525a1b1338c4a3bee1c46545801518"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.4,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The bad input is a routed IPv6 packet sent by a remote host: a Hop-by-Hop header followed by an SRH with segments_left>0. ipv6_srh_rcv() processes it on receive, and its fixed skb_push(sizeof(struct ipv6hdr)) leaves skb_network_offset() negative before ip6_route_input() and dst_input() forward the packet.\nAC:H - ipv6_srh_rcv() drops the packet unless seg6_enabled, which defaults to 0, is set both in devconf_all and on the ingress interface. The out-of-bounds memcpy in sch_frag_prepare_frag() also needs the admin to have set up tc act_ct with an MRU plus act_mirred on the forwarding path. The remote attacker cannot set up either of these.\nPR:N - No authentication is needed to send the packet. seg6_hmac_validate_skb() accepts SRHs that carry no HMAC TLV when seg6_require_hmac is at its default of 0, so an unauthenticated sender reaches the segments_left>0 branch.\nUI:N - No victim action is needed. The router processes the attacker's SRH packet in softirq receive context as soon as it arrives.\nS:U - The corruption stays inside the router's own kernel (skb metadata, then the per-CPU sch_frag_data_storage and memory after it). No VM, IOMMU or sandbox boundary is crossed.\nC:N - With the negative offset, the flow dissector and the neighbour output path read or write inside the skb head, and the bytes sch_frag reads out of bounds go into per-CPU storage. I found no path that sends kernel memory back to the attacker.\nI:H - sch_frag_prepare_frag() takes the negative skb_network_offset() as unsigned hlen and runs memcpy(&data->l2_data, skb->data, hlen). That writes packet bytes the attacker supplied past the per-CPU sch_frag_data_storage buffer, an out-of-bounds kernel write.\nA:H - The roughly 4 GB memcpy in sch_frag_prepare_frag() will fault and crash the router. On other paths the negative offset breaks flow dissection and garbles forwarded packets. The attacker can repeat this with each crafted packet."
    }
  }
}