{
  "id": "CVE-2026-98306",
  "url": "https://spydr.io/cve/CVE-2026-98306",
  "published": "2026-10-06T09:18:21.787Z",
  "modified": "2026-10-06T09:18:21.787Z",
  "score": null,
  "severity": null,
  "cvss_version": null,
  "vector": null,
  "score_source": null,
  "epss": 0.00184,
  "epss_percentile": 0.07297,
  "exploited": false,
  "kev": null,
  "ssvc_exploitation": null,
  "vendors": [
    "Linux"
  ],
  "products": [
    "Linux"
  ],
  "cwes": [],
  "description": "In the Linux kernel, the following vulnerability has been resolved: seg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulation When an SRv6 packet arrives on an interface enslaved to a VRF, vrf_ip6_rcv() sets IP6SKB_L3SLAVE in IP6CB, but decap_and_validate() has never set IPSKB_L3SLAVE in IPCB. The bit stayed clear in the common case, and with CONFIG_IPV6_MIP6 the leftover frag_max_size of a reassembled outer packet could even set it, with no VRF involved. Commit 44930446dde4 (\"ipv6: seg6: clear IPv4 control block on IPIP decapsulation\") then made the unreliable bit reliably clear. The effect of the missing flag is visible with End.DX4 when a delivery to a local address of the node reaches the socket lookup. For example, a UDP socket bound to the enslaved ingress interface does not receive any of the decapsulated packets, while an unbound socket outside the VRF does. This contradicts Documentation/networking/vrf.rst: by default the scope of an unbound UDP or TCP socket is limited to the default VRF. Set IPSKB_L3SLAVE for IPv4 in decap_and_validate(), which already does the same for IPv6. The socket lookup then matches the decapsulated packet like any other packet received on that enslaved interface. Such a packet matches an unbound UDP or TCP socket only when udp_l3mdev_accept or tcp_l3mdev_accept is set.",
  "status": "Received",
  "score_type": null,
  "scores": {
    "cvss_v40": null,
    "cvss_v31": null,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1d9f5c78903dd25a3556229eb716dd465c5f3573",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/5130afa025c95faa621adf8bac525baeb2b290d2",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/72f410616000d21a0a6ec6c93a60301b9c92e95c",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/7616242a2b37883f7322aaa1d2bd6cd0fed28315",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/8c16e1ccc082a3763dfc6bc2d3f658c1a6336f9d",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/ddf60220c925b54a1714c4722fdbdb12833232d0",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/e4d7c52f15f572608374947c6c802052e1a2fc82",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/f8fb4738ccef5f9d107845b05734a56352747b1a",
      "tags": []
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98306",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}