{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31674",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31674"
  ],
  "published": "2026-04-25T08:46:52Z",
  "summary": "netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()\n\nReject rt match rules whose addrnr exceeds IP6T_RT_HOPS.\n\nrt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[].\nValidate addrnr during rule installation so malformed rules are rejected\nbefore the match logic can use an out-of-range value.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31674"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable match is installed through the IPv6 iptables setsockopt path, so the attacker must execute local code to submit a malformed rule. Packets only trigger the bad read after that local rule installation step.\nAC:L - No race or external timing condition is required; the attacker controls the malformed `addrnr` value and can generate an IPv6 routing-header packet with enough addresses to reach the out-of-bounds access. The required netfilter match configuration is the affected component rather than an exploitation complexity barrier.\nPR:L - Rule replacement requires `CAP_NET_ADMIN`, but the check is against `sock_net(sk)->user_ns`, making it reachable to an unprivileged local user who can create a user and network namespace. This is Low rather than High under the kernel guidance.\nUI:N - After the attacker installs the malformed rule, triggering occurs by sending traffic through the affected netfilter hook. No victim user action is required.\nS:U - The bug is in kernel netfilter rule evaluation and impacts the same kernel security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - `addrnr` indexes beyond `rtinfo->addrs[]`, causing an out-of-bounds kernel memory read during packet matching. The overread can extend well beyond a few bytes, so confidentiality impact is High.\nI:N - The vulnerable operation is an out-of-bounds read used for address comparison, with no write or direct memory modification primitive. It does not by itself provide kernel memory corruption or control-flow modification.\nA:H - The out-of-bounds read can reach beyond the allocated xtables rule blob, especially with attacker-shaped tables and oversized routing-header address counts. Such kernel invalid memory access is capable of causing an oops or panic, so availability impact is High."
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}