{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0be9de2ea01e8d52646e7310a7eef5459cf07ea8"
            },
            {
              "fixed": "2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "3df40eb3a2ea58bf404a38f15a7a2768e4762cb0"
            },
            {
              "fixed": "7f6f3d087c67a4346189ef2c36481455bbc59a74"
            },
            {
              "fixed": "9c47d667963542c3cf8e3007b7f10c0904d08238"
            },
            {
              "fixed": "a209334ed929941b20810c17c3a507445b0a7c85"
            },
            {
              "fixed": "382eaa770335acf4f16a5a55524500f2bb4207df"
            },
            {
              "fixed": "2d239590d1845a706304833d40dd6d4fec20ad88"
            },
            {
              "fixed": "e84cdfdc4a6c88e8b751144458f2e04e24415a28"
            },
            {
              "fixed": "875285a165fd3b402de2ab3be0deb355d6f4caf5"
            },
            {
              "fixed": "78b20c8eeacd2e44a2d8a4cb5316d3c521d90911"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1deacb5e031e289ca5636f2db4fcae6612c05d34"
            },
            {
              "last_affected": "66a1be74230bbe098e651766c9a0cf4038db8442"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.10.188"
            },
            {
              "fixed": "5.10.267"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "4.19.291"
            },
            {
              "fixed": "4.20"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.4.251"
            },
            {
              "fixed": "5.5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.10.267"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.218"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.15.0"
            },
            {
              "fixed": "6.1.185"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.6.154"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.12.106"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.18.47"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "7.1.11"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "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-2026-80799.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: fix OOB read and u8 offset wrap in TLV parsers\n\nnfc_llcp_parse_gb_tlv() and nfc_llcp_parse_connection_tlv() contain\nthree related bugs in their TLV parsing loops:\n\n1. 'offset' is declared u8 but tlv_array_len is u16. When TLV data\n   advances offset past 255 it silently wraps to zero, causing\n   infinite loops or double-processing of buffer data.\n\n2. Before reading tlv[0] (type) and tlv[1] (length) there is no\n   check that offset+2 \u003c= tlv_array_len. A truncated TLV causes\n   an OOB read of one byte past the buffer end.\n\n3. After reading the length field, the value bytes are accessed\n   without checking offset+2+length \u003c= tlv_array_len. A crafted\n   length=0xFF on a short buffer causes up to 255 bytes of OOB\n   read past the buffer end.\n\nBoth functions are reachable without authentication via\nnfc_llcp_set_remote_gb() which feeds remote LLCP general bytes\ndirectly into nfc_llcp_parse_gb_tlv() with no additional\nvalidation.\n\nFix all three issues by widening offset from u8 to u16 and adding\nbounds checks for both the TLV header and value field before each\naccess.",
  "id": "CVE-2026-80799",
  "modified": "2026-09-06T03:31:01.839667294Z",
  "published": "2026-09-04T15:13:13.311Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d239590d1845a706304833d40dd6d4fec20ad88"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/382eaa770335acf4f16a5a55524500f2bb4207df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/78b20c8eeacd2e44a2d8a4cb5316d3c521d90911"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f6f3d087c67a4346189ef2c36481455bbc59a74"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/875285a165fd3b402de2ab3be0deb355d6f4caf5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c47d667963542c3cf8e3007b7f10c0904d08238"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a209334ed929941b20810c17c3a507445b0a7c85"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e84cdfdc4a6c88e8b751144458f2e04e24415a28"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80799.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80799"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers"
}