{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80978",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80978"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "net: cap advertised IP tunnel headroom",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: cap advertised IP tunnel headroom\n\nIP tunnel devices derive their advertised needed_headroom from lower\noutput devices. A stack of user-created devices can make the derived\nvalue larger than the 16-bit skb header offsets can represent. Once IP\noutput reserves it, skb head expansion can wrap those offsets.\n\nThe runtime transmit path already caps a growing needed_headroom at 512.\nApply the same cap when tunnel configuration publishes needed_headroom\nderived from a lower output device.\n\nCapping the advertised value is safe: IP tunnel transmit still expands\nthe skb when a packet needs more headroom. A nonsensical stacked\nconfiguration can therefore incur an extra reallocation, but it cannot\npublish an unbounded reservation to upper layers.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80978"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb889a619723032140f5d983a3a34d25a5a2bed4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b160422f8103574425e2834130e169d84c94fa1d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d36e75f5669140b66515ad3a176ca6337bd80a5e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/84783961cb8bdb36b4f41a02ce43aafc6d52b176"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bc4e05ae66c9797a0972ac44326e69c5305e0020"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/af0ee8f04bea22cdb331fa3509e17f81b48938ad"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9144f2c53a04465a6878172b523f640313c5559e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6b222adeb9340306e2ff97127c76117abb9b3df8"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Triggering the wrap requires locally creating a namespace stack of IP tunnel devices (ipip/gre/sit/ip6tnl via rtnetlink or SIOCADDTUNNEL) so bind/link-config can copy an uncapped needed_headroom, then sending packets through that stack. A remote peer cannot build that topology, so the attacker-controlled path is local.\nAC:L - The attacker fully controls tunnel creation, IFLA_IPTUN_LINK/parms.link stacking (or a netkit lower device with a large IFLA_NETKIT_HEADROOM), and the subsequent transmit. Each bind copies lower needed_headroom plus t_hlen until LL_RESERVED_SPACE exceeds 16-bit skb offsets; no race or uninfluenced victim state is required.\nPR:L - Creating and binding these tunnels needs CAP_NET_ADMIN, but rtnetlink uses netlink_ns_capable()/sk_ns_capable() against net->user_ns and ip_tunnel_ctl uses ns_capable(net->user_ns, CAP_NET_ADMIN), so an unprivileged user obtains it with unshare -Urn. Fallback tunl0/ip6tnl0 devices are created in every netns by default.\nUI:N - The attacker creates the stacked tunnels and generates the traffic that drives IP output/skb_cow_head; no other user or administrator action is required.\nS:U - The resulting skb header-offset wrap corrupts kernel heap in the same OS security authority. This is standard in-kernel privilege escalation, not a VM, IOMMU, or hypervisor boundary crossing.\nC:H - After pskb_expand_head adds a >64K nhead, u16 network_header wraps so skb->data points outside skb->head. Neighbour/flow-dissect paths then __skb_pull/read with a negative offset, producing the same unbounded KASAN use-after-free/OOB read as CVE-2024-26804/CVE-2025-40173.\nI:H - Post-wrap, skb_push/dev_hard_header and iptunnel_xmit/ip6_tnl_xmit write outer IP/GRE headers at the corrupted skb->data, giving an out-of-bounds write into unrelated kernel heap that can be used for control-flow hijacking.\nA:H - The wrapped offsets and subsequent out-of-bounds accesses reliably oops/panic (KASAN, skb_under_panic, or unmapped dereference), matching the confirmed crash impact of the earlier unbounded tunnel-headroom bugs."
    }
  }
}