CVE-2026-98379 (GCVE-0-2026-98379)
Vulnerability from cvelistv5
Published
2026-10-09 07:34
Modified
2026-10-19 09:18
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_rpfilter: reject routes without inet6_dev ip6_route_lookup() can return an error-free route whose rt6i_idev is NULL. Lowering an external nexthop device's MTU below IPV6_MIN_MTU tears down its inet6_dev while fib6_ifdown() leaves routes using nexthop objects in the FIB. An unprivileged user can construct this state with rtnetlink in a private user and network namespace, then trigger a NULL dereference through an IPv6 rpfilter lookup: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: rpfilter_mt (net/ipv6/netfilter/ip6t_rpfilter.c:75) Call Trace: ip6t_do_table (net/ipv6/netfilter/ip6_tables.c:316) nf_hook_slow (net/netfilter/core.c:619) ipv6_rcv (net/ipv6/ip6_input.c:351) __netif_receive_skb_one_core (net/core/dev.c:6216) process_backlog (net/core/dev.c:6680) __napi_poll (net/core/dev.c:7739) net_rx_action (net/core/dev.c:7959) handle_softirqs (kernel/softirq.c:622) do_softirq.part.0 (kernel/softirq.c:523) __local_bh_enable_ip (kernel/softirq.c:450) __dev_queue_xmit (net/core/dev.c:4913) packet_sendmsg (net/packet/af_packet.c:3139) __sys_sendto (net/socket.c:2252) __x64_sys_sendto (net/socket.c:2259) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Kernel panic - not syncing: Fatal exception in interrupt Reject routes without an inet6_dev immediately after lookup. Such routes are not eligible for reverse-path filtering, and the check protects all later rt6i_idev dereferences.
References
Impacted products
Vendor Product Version
Linux Linux Version: e26f9a480fb6c1b614660e824d69a74e2ce990f3
Version: e26f9a480fb6c1b614660e824d69a74e2ce990f3
Version: e26f9a480fb6c1b614660e824d69a74e2ce990f3
Version: e26f9a480fb6c1b614660e824d69a74e2ce990f3
Version: e26f9a480fb6c1b614660e824d69a74e2ce990f3
Version: e26f9a480fb6c1b614660e824d69a74e2ce990f3
Version: e26f9a480fb6c1b614660e824d69a74e2ce990f3
Version: e26f9a480fb6c1b614660e824d69a74e2ce990f3
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{
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          "programFiles": [
            "net/ipv6/netfilter/ip6t_rpfilter.c"
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_rpfilter: reject routes without inet6_dev\n\nip6_route_lookup() can return an error-free route whose rt6i_idev is\nNULL. Lowering an external nexthop device\u0027s MTU below IPV6_MIN_MTU tears\ndown its inet6_dev while fib6_ifdown() leaves routes using nexthop objects\nin the FIB. An unprivileged user can construct this state with rtnetlink\nin a private user and network namespace, then trigger a NULL dereference\nthrough an IPv6 rpfilter lookup:\n\n  Oops: general protection fault, probably for non-canonical address\n  0xdffffc0000000000\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  RIP: rpfilter_mt (net/ipv6/netfilter/ip6t_rpfilter.c:75)\n  Call Trace:\n  ip6t_do_table (net/ipv6/netfilter/ip6_tables.c:316)\n  nf_hook_slow (net/netfilter/core.c:619)\n  ipv6_rcv (net/ipv6/ip6_input.c:351)\n  __netif_receive_skb_one_core (net/core/dev.c:6216)\n  process_backlog (net/core/dev.c:6680)\n  __napi_poll (net/core/dev.c:7739)\n  net_rx_action (net/core/dev.c:7959)\n  handle_softirqs (kernel/softirq.c:622)\n  do_softirq.part.0 (kernel/softirq.c:523)\n  __local_bh_enable_ip (kernel/softirq.c:450)\n  __dev_queue_xmit (net/core/dev.c:4913)\n  packet_sendmsg (net/packet/af_packet.c:3139)\n  __sys_sendto (net/socket.c:2252)\n  __x64_sys_sendto (net/socket.c:2259)\n  do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nReject routes without an inet6_dev immediately after lookup. Such routes\nare not eligible for reverse-path filtering, and the check protects all\nlater rt6i_idev dereferences."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:18:30.044Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f4de78756b0fddbd125b2b1b77c74f2eccc8e977"
        },
        {
          "url": "https://git.kernel.org/stable/c/1681ab6dd1271f2f36047490793b78b1848bbcc9"
        },
        {
          "url": "https://git.kernel.org/stable/c/65487e9e99431ffcf05024a817f51ee4e3bd9b47"
        },
        {
          "url": "https://git.kernel.org/stable/c/f49da48bd679cfee646d6a40dd02b1933de577d1"
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          "url": "https://git.kernel.org/stable/c/290c96e5d9471d1ded9ab1e8ffbb04f6ee7b0f40"
        },
        {
          "url": "https://git.kernel.org/stable/c/eafe081ea77d25b5c8e601680671b4ecb4520e7d"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a7384bc2e66217c9a01a392281334f4423740a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b9b5323725e458906c7620a3bc10398b51ad954"
        }
      ],
      "title": "netfilter: ip6t_rpfilter: reject routes without inet6_dev",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98379",
    "datePublished": "2026-10-09T07:34:19.425Z",
    "dateReserved": "2026-09-25T10:25:14.345Z",
    "dateUpdated": "2026-10-19T09:18:30.044Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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