{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1892bf844ea0261736bd5e75546fc996e9daeedf"
            },
            {
              "fixed": "785df00bb3ae3206674a43284eb06dac575b5c64"
            },
            {
              "fixed": "2c1ad291f4cdc357f9527b688c6fda9c6ffa7890"
            },
            {
              "fixed": "dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa"
            },
            {
              "fixed": "9635507fe82949e429b3cd938876a9917125b151"
            },
            {
              "fixed": "0f344944c506b4f02d2b098489f7268b438c369e"
            },
            {
              "fixed": "bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d"
            },
            {
              "fixed": "304f5b414f4051d324b8c4a3ab0e79f7dc7e150e"
            },
            {
              "fixed": "f33cecf69095c43be88567fef92b180b858f7369"
            },
            {
              "fixed": "5cdcca5d62a66eda6b774110a44cba67bc1a8d1d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.17.0"
            },
            {
              "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-2026-80823.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: st21nfca: validate ATR_REQ length against the received frame\n\nst21nfca_tm_recv_atr_req() checks that the received ATR_REQ frame is at\nleast ST21NFCA_ATR_REQ_MIN_SIZE and that the self-declared atr_req-\u003elength\nis at least sizeof(struct st21nfca_atr_req), but never checks that\natr_req-\u003elength does not exceed the actual received length (skb-\u003elen).\n\nst21nfca_tm_send_atr_res() then trusts the declared length:\n\n\tgb_len = atr_req-\u003elength - sizeof(struct st21nfca_atr_req);\n\t...\n\tmemcpy(atr_res-\u003egbi, atr_req-\u003egbi, gb_len);\n\nso an RF peer that sends a short frame but sets atr_req-\u003elength larger\nthan the frame makes gb_len exceed the general bytes actually present,\nand the memcpy reads out of bounds past the received skb. Those bytes are\nplaced in the ATR_RES and sent back to the peer (kernel-memory disclosure\nto a proximity attacker); a larger declared length is an out-of-bounds\nread (DoS).\n\nReject frames whose declared length exceeds the received length. The\nadjacent nfc_tm_activated() path in the same function already derives its\ngeneral-bytes length from skb-\u003elen rather than the declared field.\n\nFound by 0sec (https://0sec.ai) using automated source analysis; the\nmissing bound is evident from source. Compile-tested.",
  "id": "CVE-2026-80823",
  "modified": "2026-09-06T03:31:04.037242544Z",
  "published": "2026-09-04T15:27:46.153Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f344944c506b4f02d2b098489f7268b438c369e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c1ad291f4cdc357f9527b688c6fda9c6ffa7890"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/304f5b414f4051d324b8c4a3ab0e79f7dc7e150e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5cdcca5d62a66eda6b774110a44cba67bc1a8d1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/785df00bb3ae3206674a43284eb06dac575b5c64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9635507fe82949e429b3cd938876a9917125b151"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f33cecf69095c43be88567fef92b180b858f7369"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80823.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80823"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "nfc: st21nfca: validate ATR_REQ length against the received frame"
}