{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a"
            },
            {
              "fixed": "b2ebdfe3d5b76e91f267a61cbc3f9a0e3f77071e"
            },
            {
              "fixed": "e18d044bab6d3d0280639098c3fe6621692cbfe2"
            },
            {
              "fixed": "65a0ec7783b06068dda6745dd689bf4a91ee64aa"
            },
            {
              "fixed": "1964addc8dd535a05d5d3b55b4d1ac19ae31aa65"
            },
            {
              "fixed": "389986fd79e4d43f971a03b512645a1bb63c982f"
            },
            {
              "fixed": "e87527b506c40db9af528714b7b1240918eb80fc"
            },
            {
              "fixed": "22e5177ba1196a0b272a6a46c2575eb940a939c4"
            },
            {
              "fixed": "0cfbdb0e13ab5b0765d77f96af67eb879cbc9736"
            },
            {
              "fixed": "55c68ac93e7dacc0f5f608b9c39dd4ff48cf28e8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.3.0"
            },
            {
              "fixed": "5.10.267"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.218"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.185"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.154"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.106"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.47"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.11"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80800.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: bound the connect_sn TLV walk to the skb\n\nCommit 27256cdb290e (\"nfc: llcp: bound SNL TLV parsing to the skb and\nadd length checks\") fixed the unbounded TLV walk in nfc_llcp_recv_snl(),\nand commit d8bd2dedbde5 (\"nfc: llcp: fix OOB read and u8 offset wrap in\nTLV parsers\") subsequently bounded nfc_llcp_parse_gb_tlv() and\nnfc_llcp_parse_connection_tlv(). One sibling parser sharing the same\npattern remains unbounded: nfc_llcp_connect_sn().\n\nnfc_llcp_connect_sn() walks a TLV list, reading a two-byte header\n(type, length) followed by length bytes of value, without checking that\nthe two header bytes or the declared length stay within the buffer. It\nreturns a pointer to a service name of up to 255 bytes that may point\npast the end of the skb; it is subsequently consumed by memcmp() in\nnfc_llcp_sock_from_sn(). In addition tlv_array_len was computed as\n\"skb-\u003elen - LLCP_HEADER_SIZE\" in size_t, so a CONNECT/CC frame shorter\nthan the LLCP header underflows to a huge length and the walk runs far\npast the buffer.\n\nnfc_llcp_connect_sn() is reachable from nfc_llcp_recv_connect() and\nnfc_llcp_recv_cc(), i.e. from received CONNECT and CC PDUs. A nearby\nNFC device can reach this without authentication; LLCP link activation\nhappens automatically after NFC-DEP, and the nfc_llcp_rx_skb()\ndispatcher applies no minimum-length guard.\n\nWalk the TLV list by pointer, bounded by skb_tail_pointer(skb), and\nvalidate each declared length before use, matching the approach already\nused for nfc_llcp_recv_snl(). Starting the walk at\n\u0026skb-\u003edata[LLCP_HEADER_SIZE] against the tail pointer also removes the\nsize_t underflow for short frames.\n\nFound by 0sec automated security-research tooling (https://0sec.ai).",
  "id": "CVE-2026-80800",
  "modified": "2026-09-06T03:30:35.896931973Z",
  "published": "2026-09-04T15:13:14.271Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0cfbdb0e13ab5b0765d77f96af67eb879cbc9736"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1964addc8dd535a05d5d3b55b4d1ac19ae31aa65"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22e5177ba1196a0b272a6a46c2575eb940a939c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/389986fd79e4d43f971a03b512645a1bb63c982f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/55c68ac93e7dacc0f5f608b9c39dd4ff48cf28e8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65a0ec7783b06068dda6745dd689bf4a91ee64aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2ebdfe3d5b76e91f267a61cbc3f9a0e3f77071e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e18d044bab6d3d0280639098c3fe6621692cbfe2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e87527b506c40db9af528714b7b1240918eb80fc"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80800.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80800"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "nfc: llcp: bound the connect_sn TLV walk to the skb"
}