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nfc: llcp: bound SNL TLV parsing to the skb and add length checks

Type: advisorySource: Official CVE List1 source record

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).

Announced Source revision 1
Original source ↗

CVE-2026-90223

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90223

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "19cfe5843e86cc95542d9d875c9386e197956d75",
        "lessThan": "88b36d36e12c9ba76decdb580d9c1907c084e587",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "19cfe5843e86cc95542d9d875c9386e197956d75",
        "lessThan": "587fc2a5a35b41883b22b8f808fe5d345208914b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "19cfe5843e86cc95542d9d875c9386e197956d75",
        "lessThan": "f04ac9bf2379f3e2470c400c235eb12f74891bef",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "19cfe5843e86cc95542d9d875c9386e197956d75",
        "lessThan": "02030f95820c42431280f4f945ff34247fb840ff",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "19cfe5843e86cc95542d9d875c9386e197956d75",
        "lessThan": "99fdb5c2522f365efa199d0117b641e35097041e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "19cfe5843e86cc95542d9d875c9386e197956d75",
        "lessThan": "749a9048bf51a668ec3ab6c0392ba32325607281",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "19cfe5843e86cc95542d9d875c9386e197956d75",
        "lessThan": "eeb16fb24cfe67947b832fd9ada5f488afc72579",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "19cfe5843e86cc95542d9d875c9386e197956d75",
        "lessThan": "f4c7f37f0ab990952539dc68d931d65c3657600a",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/nfc/llcp_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/nfc/llcp_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90223

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#36594 · Revision 1
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