netfilter: ip6t_rpfilter: reject routes without inet6_dev

{
  "id": "7520f91cf48fbae58ae894f390f05ad1b8a5b5f772394b28c871232b23247a0f",
  "url": "https://osv.dev/vulnerability/CVE-2026-98379",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "netfilter: ip6t_rpfilter: reject routes without inet6_dev",
    "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 withou",
    "evidence": "osv:CVE-2026-98379",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.271",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.222",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.189",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.55",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98379",
      "aliases": [
        "CVE-2026-98379"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "e26f9a480fb6c1b614660e824d69a74e2ce990f3"
                },
                {
                  "fixed": "f4de78756b0fddbd125b2b1b77c74f2eccc8e977"
                },
                {
                  "fixed": "1681ab6dd1271f2f36047490793b78b1848bbcc9"
                },
                {
                  "fixed": "65487e9e99431ffcf05024a817f51ee4e3bd9b47"
                },
                {
                  "fixed": "f49da48bd679cfee646d6a40dd02b1933de577d1"
                },
                {
                  "fixed": "290c96e5d9471d1ded9ab1e8ffbb04f6ee7b0f40"
                },
                {
                  "fixed": "eafe081ea77d25b5c8e601680671b4ecb4520e7d"
                },
                {
                  "fixed": "3a7384bc2e66217c9a01a392281334f4423740a0"
                },
                {
                  "fixed": "1b9b5323725e458906c7620a3bc10398b51ad954"
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              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98379.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.3.0"
                },
                {
                  "fixed": "5.10.271"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.222"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
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                  "fixed": "6.1.189"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.158"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.112"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.55"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98379.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.874905622Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1681ab6dd1271f2f36047490793b78b1848bbcc9",
        "https://git.kernel.org/stable/c/1b9b5323725e458906c7620a3bc10398b51ad954",
        "https://git.kernel.org/stable/c/290c96e5d9471d1ded9ab1e8ffbb04f6ee7b0f40",
        "https://git.kernel.org/stable/c/3a7384bc2e66217c9a01a392281334f4423740a0",
        "https://git.kernel.org/stable/c/65487e9e99431ffcf05024a817f51ee4e3bd9b47",
        "https://git.kernel.org/stable/c/eafe081ea77d25b5c8e601680671b4ecb4520e7d",
        "https://git.kernel.org/stable/c/f49da48bd679cfee646d6a40dd02b1933de577d1",
        "https://git.kernel.org/stable/c/f4de78756b0fddbd125b2b1b77c74f2eccc8e977",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98379.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98379",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98379.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98379",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 506364,
  "published_at": "2026-10-09T07:34:19.425+00:00"
}