CVE-2026-90223 (GCVE-0-2026-90223)
Vulnerability from cvelistv5
Published
2026-09-17 16:07
Modified
2026-10-19 08:59
Severity ?
7.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: bound SNL TLV parsing to the skb and add length checks nfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length pair derived from skb->len, without bounding reads to the actual skb data. Three problems followed: - For a short frame (skb->len < LLCP_HEADER_SIZE), tlv_len underflowed. - The per-TLV header (type, length) was read without checking that two bytes remained. - A declared TLV length could run past the end of the buffer, and an SDREQ with length == 0 made "service_name_len = length - 1" underflow (size_t), driving an out-of-bounds read in the following strncmp() / nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3] without a length check. A nearby NFC device can reach this without authentication; LLCP link activation happens automatically after NFC-DEP. Walk the TLV list by pointer, bounded by skb_tail_pointer() over the linear skb data, and validate each TLV declared length before use. Add explicit length checks for SDREQ (>= 1) and SDRES (exactly 2). Found by 0sec automated security-research tooling (https://0sec.ai).
References
Impacted products
Vendor Product Version
Linux Linux Version: 19cfe5843e86cc95542d9d875c9386e197956d75
Version: 19cfe5843e86cc95542d9d875c9386e197956d75
Version: 19cfe5843e86cc95542d9d875c9386e197956d75
Version: 19cfe5843e86cc95542d9d875c9386e197956d75
Version: 19cfe5843e86cc95542d9d875c9386e197956d75
Version: 19cfe5843e86cc95542d9d875c9386e197956d75
Version: 19cfe5843e86cc95542d9d875c9386e197956d75
Version: 19cfe5843e86cc95542d9d875c9386e197956d75
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/llcp_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "3.8"
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              "version": "0",
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              "version": "5.10.270",
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              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
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            {
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              "status": "unaffected",
              "version": "7.2.6",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
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                  "versionEndExcluding": "7.3",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: bound SNL TLV parsing to the skb and add length checks\n\nnfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length\npair derived from skb-\u003elen, without bounding reads to the actual skb\ndata. Three problems followed:\n\n  - For a short frame (skb-\u003elen \u003c LLCP_HEADER_SIZE), tlv_len underflowed.\n  - The per-TLV header (type, length) was read without checking that two\n    bytes remained.\n  - A declared TLV length could run past the end of the buffer, and an\n    SDREQ with length == 0 made \"service_name_len = length - 1\" underflow\n    (size_t), driving an out-of-bounds read in the following strncmp() /\n    nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3]\n    without a length check.\n\nA nearby NFC device can reach this without authentication; LLCP link\nactivation happens automatically after NFC-DEP.\n\nWalk the TLV list by pointer, bounded by skb_tail_pointer() over the\nlinear skb data, and validate each TLV declared length before use. Add\nexplicit length checks for SDREQ (\u003e= 1) and SDRES (exactly 2).\n\nFound by 0sec automated security-research tooling (https://0sec.ai)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - A nearby NFC-DEP peer supplies the malformed bytes in an LLCP SNL PDU (ptype LLCP_PDU_SNL, DSAP/SSAP LLCP_SAP_SDP). nfc_tm_data_received() or the initiator nfc_llcp_recv() callback delivers that skb through __nfc_llcp_recv() and nfc_llcp_rx_skb() into nfc_llcp_recv_snl(), which walks attacker-controlled SDREQ/SDRES TLVs. NFC is radio-range, so Adjacent.\nAC:L - The attacker fully controls the SNL payload, including each TLV type and u8 length. An SDREQ with length 0 or 15, or a declared length past the remaining skb, hits the missing header/value checks in nfc_llcp_recv_snl() deterministically, with no race or heap layout the attacker cannot set.\nPR:N - nfc_llcp_recv_snl() only rejects PDUs whose DSAP/SSAP are not LLCP_SAP_SDP; it does not require LLCP CONNECT, SDP credentials, or any host account. After nfc_dep_link_is_up(), an unauthenticated NFC-DEP peer can send SNL immediately.\nUI:N - nfc_tm_activated() calls nfc_dep_link_is_up() automatically when protocol is NFC_PROTO_NFC_DEP_MASK, after which nfc_tm_data_received() hands DEP payloads to LLCP. The attacker triggers the SNL parse with their own frames; no extra victim click, mount, or dialog is required.\nS:U - nfc_llcp_recv_snl() over-reads kernel memory adjacent to the received skb in the LLCP receive path. That stays inside the host kernel\u0027s security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:L - A short SDREQ with length==15 makes strncmp(service_name, \"urn:nfc:sn:sdp\", 14) read up to 14 bytes past the skb, and length==0 uses out-of-bounds tlv[2] as the tid echoed by nfc_llcp_build_sdres_tlv(). nfc_llcp_sock_from_sn() memcmp is gated on matching socket name length, so this is a small bounded leak, not an arbitrary read.\nI:N - The SNL walker only reads past the skb; it does not write past it. The SDRES path assigns tlv[3] into an existing pending nfc_llcp_sdp_tlv-\u003esap on a tid match, which is an in-object protocol field a well-formed SDRES can already set, not a kernel write primitive.\nA:H - nfc_llcp_recv_snl() can read tlv[0]/tlv[1] when fewer than two bytes remain, and strncmp()/tlv[2] past the skb tail. Those over-reads can fault on an unmapped page or KFENCE guard and oops the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:59:59.669Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/88b36d36e12c9ba76decdb580d9c1907c084e587"
        },
        {
          "url": "https://git.kernel.org/stable/c/587fc2a5a35b41883b22b8f808fe5d345208914b"
        },
        {
          "url": "https://git.kernel.org/stable/c/f04ac9bf2379f3e2470c400c235eb12f74891bef"
        },
        {
          "url": "https://git.kernel.org/stable/c/02030f95820c42431280f4f945ff34247fb840ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/99fdb5c2522f365efa199d0117b641e35097041e"
        },
        {
          "url": "https://git.kernel.org/stable/c/749a9048bf51a668ec3ab6c0392ba32325607281"
        },
        {
          "url": "https://git.kernel.org/stable/c/eeb16fb24cfe67947b832fd9ada5f488afc72579"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4c7f37f0ab990952539dc68d931d65c3657600a"
        }
      ],
      "title": "nfc: llcp: bound SNL TLV parsing to the skb and add length checks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90223",
    "datePublished": "2026-09-17T16:07:33.355Z",
    "dateReserved": "2026-09-11T19:38:34.794Z",
    "dateUpdated": "2026-10-19T08:59:59.669Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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