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CVE-2026-80798 (GCVE-0-2026-80798)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-09-04 15:13
VLAI
Title
nfc: llcp: reject PDUs shorter than the LLCP header
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: reject PDUs shorter than the LLCP header Every LLCP PDU begins with a two-byte header (DSAP/SSAP + PTYPE), but the receive path never checked that a frame is at least LLCP_HEADER_SIZE bytes before parsing it. nfc_llcp_rx_skb() reads the header via nfc_llcp_ptype()/nfc_llcp_dsap()/ nfc_llcp_ssap(), which dereference pdu->data[0] and pdu->data[1], and a CONNECT or CC PDU then computes tlv_array_len = skb->len - LLCP_HEADER_SIZE; as a size_t and hands it to the TLV walk. When the frame is shorter than the header the subtraction wraps to a huge value and the walk runs far past the buffer, an out-of-bounds read. A nearby NFC device can reach this without authentication; LLCP link activation happens automatically after NFC-DEP. Guard the common receive choke point __nfc_llcp_recv(), shared by both the target (nfc_llcp_data_received()) and initiator (nfc_llcp_recv()) paths, so a short skb is dropped before the rx_work worker parses it. Use pskb_may_pull() rather than a skb->len test so the two header bytes are guaranteed to sit in the skb linear area even for a non-linear skb, matching how the sibling NCI and HCI receive paths validate their headers. Reproduced with a KFENCE out-of-bounds read via /dev/virtual_nci on linux-next. 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 , < e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < f36cffea24bf3e2cc29a00d4b51dbcadc087d810 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < a7b9b449f5a5132221fff6adc11a9431ab8cd914 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 3793d768b40f38bb97265dd5b9a8b8655c4e1b1d (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < eab47618e282602197db287ecbd1b09d356a2515 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < e969e98410051b1ef8cc318bfe0c7e3f24ec766d (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < ae5f20f5842f440b72d030e3a34fe182dd8eae42 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < d3d90243393c48146911c67fd3792b549d21d9e6 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 95674f506c6376d6722a23144c9acd26609771ed (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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          "lang": "en",
          "value": "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)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:13:12.282Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/95674f506c6376d6722a23144c9acd26609771ed"
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      ],
      "title": "nfc: llcp: reject PDUs shorter than the LLCP header",
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      "status": "final",
      "title": "nfc: llcp: reject PDUs shorter than the LLCP header",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80798.json",
      "version": "2"
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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).\"}],\"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\":\"e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"f36cffea24bf3e2cc29a00d4b51dbcadc087d810\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"a7b9b449f5a5132221fff6adc11a9431ab8cd914\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"3793d768b40f38bb97265dd5b9a8b8655c4e1b1d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"eab47618e282602197db287ecbd1b09d356a2515\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"e969e98410051b1ef8cc318bfe0c7e3f24ec766d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"ae5f20f5842f440b72d030e3a34fe182dd8eae42\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"d3d90243393c48146911c67fd3792b549d21d9e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\"lessThan\":\"95674f506c6376d6722a23144c9acd26609771ed\",\"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/3793d768b40f38bb97265dd5b9a8b8655c4e1b1d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95674f506c6376d6722a23144c9acd26609771ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7b9b449f5a5132221fff6adc11a9431ab8cd914\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ae5f20f5842f440b72d030e3a34fe182dd8eae42\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d3d90243393c48146911c67fd3792b549d21d9e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e969e98410051b1ef8cc318bfe0c7e3f24ec766d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eab47618e282602197db287ecbd1b09d356a2515\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f36cffea24bf3e2cc29a00d4b51dbcadc087d810\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-08T23:58:43Z",
      "cve": "CVE-2026-80798",
      "id": "CVE-2026-80798",
      "initial_release_date": "2026-09-08T23:58:43Z",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "88",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80798",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80798.json",
      "version": "2"
    }
  }
}



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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.