{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a"
            },
            {
              "fixed": "e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82"
            },
            {
              "fixed": "f36cffea24bf3e2cc29a00d4b51dbcadc087d810"
            },
            {
              "fixed": "a7b9b449f5a5132221fff6adc11a9431ab8cd914"
            },
            {
              "fixed": "3793d768b40f38bb97265dd5b9a8b8655c4e1b1d"
            },
            {
              "fixed": "eab47618e282602197db287ecbd1b09d356a2515"
            },
            {
              "fixed": "e969e98410051b1ef8cc318bfe0c7e3f24ec766d"
            },
            {
              "fixed": "ae5f20f5842f440b72d030e3a34fe182dd8eae42"
            },
            {
              "fixed": "d3d90243393c48146911c67fd3792b549d21d9e6"
            },
            {
              "fixed": "95674f506c6376d6722a23144c9acd26609771ed"
            }
          ],
          "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-2026-80798.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: reject PDUs shorter than the LLCP header\n\nEvery LLCP PDU begins with a two-byte header (DSAP/SSAP + PTYPE), but the\nreceive path never checked that a frame is at least LLCP_HEADER_SIZE bytes\nbefore parsing it.\n\nnfc_llcp_rx_skb() reads the header via nfc_llcp_ptype()/nfc_llcp_dsap()/\nnfc_llcp_ssap(), which dereference pdu-\u003edata[0] and pdu-\u003edata[1], and a\nCONNECT or CC PDU then computes\n\n\ttlv_array_len = skb-\u003elen - LLCP_HEADER_SIZE;\n\nas a size_t and hands it to the TLV walk. When the frame is shorter than\nthe header the subtraction wraps to a huge value and the walk runs far\npast the buffer, an out-of-bounds read.\n\nA nearby NFC device can reach this without authentication; LLCP link\nactivation happens automatically after NFC-DEP.\n\nGuard the common receive choke point __nfc_llcp_recv(), shared by both the\ntarget (nfc_llcp_data_received()) and initiator (nfc_llcp_recv()) paths, so\na short skb is dropped before the rx_work worker parses it. Use\npskb_may_pull() rather than a skb-\u003elen test so the two header bytes are\nguaranteed to sit in the skb linear area even for a non-linear skb,\nmatching how the sibling NCI and HCI receive paths validate their headers.\n\nReproduced with a KFENCE out-of-bounds read via /dev/virtual_nci on\nlinux-next.\n\nFound by 0sec automated security-research tooling (https://0sec.ai).",
  "id": "CVE-2026-80798",
  "modified": "2026-09-06T03:31:03.007279360Z",
  "published": "2026-09-04T15:13:12.282Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3793d768b40f38bb97265dd5b9a8b8655c4e1b1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95674f506c6376d6722a23144c9acd26609771ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7b9b449f5a5132221fff6adc11a9431ab8cd914"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae5f20f5842f440b72d030e3a34fe182dd8eae42"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3d90243393c48146911c67fd3792b549d21d9e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e969e98410051b1ef8cc318bfe0c7e3f24ec766d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eab47618e282602197db287ecbd1b09d356a2515"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f36cffea24bf3e2cc29a00d4b51dbcadc087d810"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80798.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80798"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "nfc: llcp: reject PDUs shorter than the LLCP header"
}