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nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc() nfc_llcp_recv_hdlc() reads the sequence byte skb->data[2], via nfc_llcp_ns()/nfc_llcp_nr(), before any length check. The receive path only guarantees the two-byte LLCP header -- __nfc_llcp_recv() checks it with pskb_may_pull() and nfc_llcp_recv_agf() admits two-byte inner PDUs -- so a two-byte I, RR or RNR PDU reads one byte of uninitialised skb tailroom. The byte becomes N(R)/N(S); a peer can already set those with a well-formed PDU, so this is acting on uninitialised memory, not new peer control. Guard the read with pskb_may_pull(), as commit 95674f506c63 ("nfc: llcp: reject PDUs shorter than the LLCP header") did for the two-byte header, so the sequence byte is present and linear before it is read. RR and RNR PDUs are LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE bytes and an I PDU is longer, so no valid frame is rejected; a truncated PDU is malformed, so return without a DM reply.

Announced Source revision 1
Original source ↗

CVE-2026-98482

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-2026-98482

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": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "3afdbebfee2ef7e9510880868cfb482cbffe6836",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "9b4086eb67a9a3b1ce69fef1b6793827363703ce",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "51b6d73373589abb9de4d84767b0db1bc8d395d9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "066205553a0106565bcede934f5721c25ebd6e4e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "18f60ee882403d5b48097f5f6ae45f794e4cc643",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "810f204ef8f61f0c930cf6b3280050b3ee6a8ae7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "744e61bd06188d8bb068c26a461c252f242b05c9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "273f9d667cde649f8de9d72b1303cc2f4b658c50",
        "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": "3.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "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-2026-98482

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38528 · Revision 1
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