CVE-2026-98379 (GCVE-0-2026-98379)

Vulnerability from cvelistv5 – Published: 2026-10-09 07:34 – Updated: 2026-10-19 09:18
VLAI
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 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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e26f9a480fb6c1b614660e824d69a74e2ce990f3 , < f4de78756b0fddbd125b2b1b77c74f2eccc8e977 (git)
Affected: e26f9a480fb6c1b614660e824d69a74e2ce990f3 , < 1681ab6dd1271f2f36047490793b78b1848bbcc9 (git)
Affected: e26f9a480fb6c1b614660e824d69a74e2ce990f3 , < 65487e9e99431ffcf05024a817f51ee4e3bd9b47 (git)
Affected: e26f9a480fb6c1b614660e824d69a74e2ce990f3 , < f49da48bd679cfee646d6a40dd02b1933de577d1 (git)
Affected: e26f9a480fb6c1b614660e824d69a74e2ce990f3 , < 290c96e5d9471d1ded9ab1e8ffbb04f6ee7b0f40 (git)
Affected: e26f9a480fb6c1b614660e824d69a74e2ce990f3 , < eafe081ea77d25b5c8e601680671b4ecb4520e7d (git)
Affected: e26f9a480fb6c1b614660e824d69a74e2ce990f3 , < 3a7384bc2e66217c9a01a392281334f4423740a0 (git)
Affected: e26f9a480fb6c1b614660e824d69a74e2ce990f3 , < 1b9b5323725e458906c7620a3bc10398b51ad954 (git)
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Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
            "net/ipv6/netfilter/ip6t_rpfilter.c"
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          "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."
        }
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          "url": "https://git.kernel.org/stable/c/1b9b5323725e458906c7620a3bc10398b51ad954"
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    "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"
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      "date": "2026-10-29",
      "epss": "0.00171",
      "percentile": "0.06467"
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    "microsoft_vex": {
      "current_release_date": "2026-10-21T18:41:32.000Z",
      "cve": "CVE-2026-98379",
      "id": "msrc_CVE-2026-98379",
      "initial_release_date": "2026-10-10T01:12:53.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "netfilter: ip6t_rpfilter: reject routes without inet6_dev",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98379.json",
      "version": "4"
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        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-98379",
        "lastModified": "2026-10-19T10:18:41.187",
        "metrics": {},
        "published": "2026-10-09T08:16:56.250",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1681ab6dd1271f2f36047490793b78b1848bbcc9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1b9b5323725e458906c7620a3bc10398b51ad954"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/290c96e5d9471d1ded9ab1e8ffbb04f6ee7b0f40"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3a7384bc2e66217c9a01a392281334f4423740a0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/65487e9e99431ffcf05024a817f51ee4e3bd9b47"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/eafe081ea77d25b5c8e601680671b4ecb4520e7d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f49da48bd679cfee646d6a40dd02b1933de577d1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f4de78756b0fddbd125b2b1b77c74f2eccc8e977"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-10T15:50:17+00:00",
      "cve": "CVE-2026-98379",
      "id": "CVE-2026-98379",
      "initial_release_date": "2026-10-09T00:00:00+00:00",
      "product_status:known_affected": "263",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: ip6t_rpfilter: reject routes without inet6_dev",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98379.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-19T23:52:49Z",
      "cve": "CVE-2026-98379",
      "id": "CVE-2026-98379",
      "initial_release_date": "2026-10-09T16:52:21Z",
      "product_status:known_affected": "344",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98379",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98379.json",
      "version": "3"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.