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CVE-2026-80823 (GCVE-0-2026-80823)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:27 – Updated: 2026-09-04 15:29
VLAI
Title
nfc: st21nfca: validate ATR_REQ length against the received frame
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: st21nfca: validate ATR_REQ length against the received frame st21nfca_tm_recv_atr_req() checks that the received ATR_REQ frame is at least ST21NFCA_ATR_REQ_MIN_SIZE and that the self-declared atr_req->length is at least sizeof(struct st21nfca_atr_req), but never checks that atr_req->length does not exceed the actual received length (skb->len). st21nfca_tm_send_atr_res() then trusts the declared length: gb_len = atr_req->length - sizeof(struct st21nfca_atr_req); ... memcpy(atr_res->gbi, atr_req->gbi, gb_len); so an RF peer that sends a short frame but sets atr_req->length larger than the frame makes gb_len exceed the general bytes actually present, and the memcpy reads out of bounds past the received skb. Those bytes are placed in the ATR_RES and sent back to the peer (kernel-memory disclosure to a proximity attacker); a larger declared length is an out-of-bounds read (DoS). Reject frames whose declared length exceeds the received length. The adjacent nfc_tm_activated() path in the same function already derives its general-bytes length from skb->len rather than the declared field. Found by 0sec (https://0sec.ai) using automated source analysis; the missing bound is evident from source. Compile-tested.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1892bf844ea0261736bd5e75546fc996e9daeedf , < 785df00bb3ae3206674a43284eb06dac575b5c64 (git)
Affected: 1892bf844ea0261736bd5e75546fc996e9daeedf , < 2c1ad291f4cdc357f9527b688c6fda9c6ffa7890 (git)
Affected: 1892bf844ea0261736bd5e75546fc996e9daeedf , < dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa (git)
Affected: 1892bf844ea0261736bd5e75546fc996e9daeedf , < 9635507fe82949e429b3cd938876a9917125b151 (git)
Affected: 1892bf844ea0261736bd5e75546fc996e9daeedf , < 0f344944c506b4f02d2b098489f7268b438c369e (git)
Affected: 1892bf844ea0261736bd5e75546fc996e9daeedf , < bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d (git)
Affected: 1892bf844ea0261736bd5e75546fc996e9daeedf , < 304f5b414f4051d324b8c4a3ab0e79f7dc7e150e (git)
Affected: 1892bf844ea0261736bd5e75546fc996e9daeedf , < f33cecf69095c43be88567fef92b180b858f7369 (git)
Affected: 1892bf844ea0261736bd5e75546fc996e9daeedf , < 5cdcca5d62a66eda6b774110a44cba67bc1a8d1d (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 5.10.267 , ≤ 5.10.* (semver)
Unaffected: 5.15.218 , ≤ 5.15.* (semver)
Unaffected: 6.1.185 , ≤ 6.1.* (semver)
Unaffected: 6.6.154 , ≤ 6.6.* (semver)
Unaffected: 6.12.106 , ≤ 6.12.* (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:29:25.316Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/785df00bb3ae3206674a43284eb06dac575b5c64"
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        {
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        {
          "url": "https://git.kernel.org/stable/c/dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/9635507fe82949e429b3cd938876a9917125b151"
        },
        {
          "url": "https://git.kernel.org/stable/c/0f344944c506b4f02d2b098489f7268b438c369e"
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          "url": "https://git.kernel.org/stable/c/bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d"
        },
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          "url": "https://git.kernel.org/stable/c/304f5b414f4051d324b8c4a3ab0e79f7dc7e150e"
        },
        {
          "url": "https://git.kernel.org/stable/c/f33cecf69095c43be88567fef92b180b858f7369"
        },
        {
          "url": "https://git.kernel.org/stable/c/5cdcca5d62a66eda6b774110a44cba67bc1a8d1d"
        }
      ],
      "title": "nfc: st21nfca: validate ATR_REQ length against the received frame",
      "x_generator": {
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      }
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    "cveId": "CVE-2026-80823",
    "datePublished": "2026-09-04T15:27:46.153Z",
    "dateReserved": "2026-08-26T14:34:25.795Z",
    "dateUpdated": "2026-09-04T15:29:25.316Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-80823",
      "date": "2026-09-15",
      "epss": "0.00195",
      "percentile": "0.09419"
    },
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      "cve": "CVE-2026-80823",
      "id": "msrc_CVE-2026-80823",
      "initial_release_date": "2026-09-07T01:50:36.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nfc: st21nfca: validate ATR_REQ length against the received frame",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80823.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80823\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:10.080\",\"lastModified\":\"2026-09-04T16:18:10.080\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/nfc/st21nfca/dep.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1892bf844ea0261736bd5e75546fc996e9daeedf\",\"lessThan\":\"785df00bb3ae3206674a43284eb06dac575b5c64\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1892bf844ea0261736bd5e75546fc996e9daeedf\",\"lessThan\":\"2c1ad291f4cdc357f9527b688c6fda9c6ffa7890\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1892bf844ea0261736bd5e75546fc996e9daeedf\",\"lessThan\":\"dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1892bf844ea0261736bd5e75546fc996e9daeedf\",\"lessThan\":\"9635507fe82949e429b3cd938876a9917125b151\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1892bf844ea0261736bd5e75546fc996e9daeedf\",\"lessThan\":\"0f344944c506b4f02d2b098489f7268b438c369e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1892bf844ea0261736bd5e75546fc996e9daeedf\",\"lessThan\":\"bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1892bf844ea0261736bd5e75546fc996e9daeedf\",\"lessThan\":\"304f5b414f4051d324b8c4a3ab0e79f7dc7e150e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1892bf844ea0261736bd5e75546fc996e9daeedf\",\"lessThan\":\"f33cecf69095c43be88567fef92b180b858f7369\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1892bf844ea0261736bd5e75546fc996e9daeedf\",\"lessThan\":\"5cdcca5d62a66eda6b774110a44cba67bc1a8d1d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/nfc/st21nfca/dep.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.267\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.218\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.185\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.154\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.106\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.11\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.1\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0f344944c506b4f02d2b098489f7268b438c369e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2c1ad291f4cdc357f9527b688c6fda9c6ffa7890\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/304f5b414f4051d324b8c4a3ab0e79f7dc7e150e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5cdcca5d62a66eda6b774110a44cba67bc1a8d1d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/785df00bb3ae3206674a43284eb06dac575b5c64\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9635507fe82949e429b3cd938876a9917125b151\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f33cecf69095c43be88567fef92b180b858f7369\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-08T17:16:50Z",
      "cve": "CVE-2026-80823",
      "id": "CVE-2026-80823",
      "initial_release_date": "2026-09-08T17:16:50Z",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "88",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80823",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80823.json",
      "version": "2"
    }
  }
}



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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.