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              "value": "AV:L - tun_get_user() runs on write/sendmsg to /dev/net/tun after ndo_set_rx_headroom stores an oversized tun-\u003ealign. That is a local tun/tap injection path, not parsing of frames received from a remote peer.\nAC:L - The attacker fully controls both sides: inflate rx headroom via netkit IFLA_NETKIT_HEADROOM or the OVS/veth/VXLAN and bridge/veth/GRETAP loops, then write a TUN frame. No race or uninfluenced victim state is required.\nPR:L - TUNSETIFF uses ns_capable(net-\u003euser_ns, CAP_NET_ADMIN) and OVS vport commands use GENL_UNS_ADMIN_PERM, so an unprivileged user with a user+net namespace can create the topology and trigger the write.\nUI:N - The attacker opens /dev/net/tun, configures local net devices, and writes the frame; no separate victim action is required.\nS:U - The out-of-bounds access occurs in the same kernel that handles the local TUN write and yields privilege escalation within that kernel, not a VM/IOMMU boundary crossing.\nC:H - SKB_MAX_HEAD underflow wraps the linear length so tun_alloc_skb()/skb_reserve() can place skb-\u003edata outside the allocated head, turning later header reads and packet processing into out-of-bounds kernel reads.\nI:H - After skb-\u003edata is moved outside the allocated head, skb_copy_datagram_from_iter copies attacker-controlled frame bytes relative to that pointer, an out-of-bounds write usable for kernel corruption and control-flow hijacking.\nA:H - The misplaced skb leads to a kernel oops, BUG() in eth_type_trans/__skb_pull on a nonlinear TAP skb, or panic when the out-of-bounds access is hit."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T11:59:35.300Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ad715e713610d2d5473c3a6498c825ccecf26491"
        },
        {
          "url": "https://git.kernel.org/stable/c/708e87937de93f445225c134a2e20519f9b4ce60"
        },
        {
          "url": "https://git.kernel.org/stable/c/18ef24cdb2eba32e38f1d27f2d02b7b4212e8f76"
        },
        {
          "url": "https://git.kernel.org/stable/c/010eee265d6bd8769b6a523d2a0693d9b3f5df43"
        },
        {
          "url": "https://git.kernel.org/stable/c/379d85c7f25f3e05a428225e6b8a65613c6e9b9d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e098d9cc8859614a7f7baebc96e32a5a16b18ed2"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ada54ea63e48b9c1608e917ccb7dfadbe86db28"
        },
        {
          "url": "https://git.kernel.org/stable/c/447c9303942c439a117d9b76ce6d6e2116b38ee7"
        }
      ],
      "title": "net: tun: bound receive headroom",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-81000",
    "datePublished": "2026-09-11T19:42:54.181Z",
    "dateReserved": "2026-08-26T14:34:25.812Z",
    "dateUpdated": "2026-09-14T11:59:35.300Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}