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CVE-2026-80800 (GCVE-0-2026-80800)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-09-04 15:13
VLAI
Title
nfc: llcp: bound the connect_sn TLV walk to the skb
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: bound the connect_sn TLV walk to the skb Commit 27256cdb290e ("nfc: llcp: bound SNL TLV parsing to the skb and add length checks") fixed the unbounded TLV walk in nfc_llcp_recv_snl(), and commit d8bd2dedbde5 ("nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers") subsequently bounded nfc_llcp_parse_gb_tlv() and nfc_llcp_parse_connection_tlv(). One sibling parser sharing the same pattern remains unbounded: nfc_llcp_connect_sn(). nfc_llcp_connect_sn() walks a TLV list, reading a two-byte header (type, length) followed by length bytes of value, without checking that the two header bytes or the declared length stay within the buffer. It returns a pointer to a service name of up to 255 bytes that may point past the end of the skb; it is subsequently consumed by memcmp() in nfc_llcp_sock_from_sn(). In addition tlv_array_len was computed as "skb->len - LLCP_HEADER_SIZE" in size_t, so a CONNECT/CC frame shorter than the LLCP header underflows to a huge length and the walk runs far past the buffer. nfc_llcp_connect_sn() is reachable from nfc_llcp_recv_connect() and nfc_llcp_recv_cc(), i.e. from received CONNECT and CC PDUs. A nearby NFC device can reach this without authentication; LLCP link activation happens automatically after NFC-DEP, and the nfc_llcp_rx_skb() dispatcher applies no minimum-length guard. Walk the TLV list by pointer, bounded by skb_tail_pointer(skb), and validate each declared length before use, matching the approach already used for nfc_llcp_recv_snl(). Starting the walk at &skb->data[LLCP_HEADER_SIZE] against the tail pointer also removes the size_t underflow for short frames. Found by 0sec automated security-research tooling (https://0sec.ai).
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < b2ebdfe3d5b76e91f267a61cbc3f9a0e3f77071e (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < e18d044bab6d3d0280639098c3fe6621692cbfe2 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 65a0ec7783b06068dda6745dd689bf4a91ee64aa (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 1964addc8dd535a05d5d3b55b4d1ac19ae31aa65 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 389986fd79e4d43f971a03b512645a1bb63c982f (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < e87527b506c40db9af528714b7b1240918eb80fc (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 22e5177ba1196a0b272a6a46c2575eb940a939c4 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 0cfbdb0e13ab5b0765d77f96af67eb879cbc9736 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 55c68ac93e7dacc0f5f608b9c39dd4ff48cf28e8 (git)
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Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (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)
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          "value": "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)."
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      "date": "2026-09-14",
      "epss": "0.00234",
      "percentile": "0.14366"
    },
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      "cve": "CVE-2026-80800",
      "id": "msrc_CVE-2026-80800",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nfc: llcp: bound the connect_sn TLV walk to the skb",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80800.json",
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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).\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/nfc/llcp_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"b2ebdfe3d5b76e91f267a61cbc3f9a0e3f77071e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"e18d044bab6d3d0280639098c3fe6621692cbfe2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"65a0ec7783b06068dda6745dd689bf4a91ee64aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"1964addc8dd535a05d5d3b55b4d1ac19ae31aa65\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"389986fd79e4d43f971a03b512645a1bb63c982f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"e87527b506c40db9af528714b7b1240918eb80fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"22e5177ba1196a0b272a6a46c2575eb940a939c4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"0cfbdb0e13ab5b0765d77f96af67eb879cbc9736\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"55c68ac93e7dacc0f5f608b9c39dd4ff48cf28e8\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/nfc/llcp_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.3\",\"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/0cfbdb0e13ab5b0765d77f96af67eb879cbc9736\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1964addc8dd535a05d5d3b55b4d1ac19ae31aa65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/22e5177ba1196a0b272a6a46c2575eb940a939c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/389986fd79e4d43f971a03b512645a1bb63c982f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/55c68ac93e7dacc0f5f608b9c39dd4ff48cf28e8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/65a0ec7783b06068dda6745dd689bf4a91ee64aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b2ebdfe3d5b76e91f267a61cbc3f9a0e3f77071e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e18d044bab6d3d0280639098c3fe6621692cbfe2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e87527b506c40db9af528714b7b1240918eb80fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-08T23:58:38Z",
      "cve": "CVE-2026-80800",
      "id": "CVE-2026-80800",
      "initial_release_date": "2026-09-08T23:58:38Z",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "88",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80800",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80800.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • 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.