CVE-2026-98482 (GCVE-0-2026-98482)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:15 – Updated: 2026-10-19 09:20
VLAI
Title
nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6640 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 3afdbebfee2ef7e9510880868cfb482cbffe6836 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 9b4086eb67a9a3b1ce69fef1b6793827363703ce (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 51b6d73373589abb9de4d84767b0db1bc8d395d9 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 066205553a0106565bcede934f5721c25ebd6e4e (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 18f60ee882403d5b48097f5f6ae45f794e4cc643 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 810f204ef8f61f0c930cf6b3280050b3ee6a8ae7 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 744e61bd06188d8bb068c26a461c252f242b05c9 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 273f9d667cde649f8de9d72b1303cc2f4b658c50 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()\n\nnfc_llcp_recv_hdlc() reads the sequence byte skb-\u003edata[2], via\nnfc_llcp_ns()/nfc_llcp_nr(), before any length check. The receive path\nonly guarantees the two-byte LLCP header -- __nfc_llcp_recv() checks it\nwith pskb_may_pull() and nfc_llcp_recv_agf() admits two-byte inner PDUs\n-- so a two-byte I, RR or RNR PDU reads one byte of uninitialised skb\ntailroom. The byte becomes N(R)/N(S); a peer can already set those with\na well-formed PDU, so this is acting on uninitialised memory, not new\npeer control.\n\nGuard the read with pskb_may_pull(), as commit 95674f506c63 (\"nfc: llcp:\nreject PDUs shorter than the LLCP header\") did for the two-byte header,\nso the sequence byte is present and linear before it is read. RR and RNR\nPDUs are LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE bytes and an I PDU is\nlonger, so no valid frame is rejected; a truncated PDU is malformed, so\nreturn without a DM reply."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:20:19.712Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3afdbebfee2ef7e9510880868cfb482cbffe6836"
        },
        {
          "url": "https://git.kernel.org/stable/c/9b4086eb67a9a3b1ce69fef1b6793827363703ce"
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          "url": "https://git.kernel.org/stable/c/51b6d73373589abb9de4d84767b0db1bc8d395d9"
        },
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          "url": "https://git.kernel.org/stable/c/066205553a0106565bcede934f5721c25ebd6e4e"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/273f9d667cde649f8de9d72b1303cc2f4b658c50"
        }
      ],
      "title": "nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()",
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        "engine": "bippy-1.2.0"
      }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98482",
    "datePublished": "2026-10-18T15:15:56.227Z",
    "dateReserved": "2026-09-25T10:25:14.352Z",
    "dateUpdated": "2026-10-19T09:20:19.712Z",
    "state": "PUBLISHED"
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98482.json",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()\n\nnfc_llcp_recv_hdlc() reads the sequence byte skb-\u003edata[2], via\nnfc_llcp_ns()/nfc_llcp_nr(), before any length check. The receive path\nonly guarantees the two-byte LLCP header -- __nfc_llcp_recv() checks it\nwith pskb_may_pull() and nfc_llcp_recv_agf() admits two-byte inner PDUs\n-- so a two-byte I, RR or RNR PDU reads one byte of uninitialised skb\ntailroom. The byte becomes N(R)/N(S); a peer can already set those with\na well-formed PDU, so this is acting on uninitialised memory, not new\npeer control.\n\nGuard the read with pskb_may_pull(), as commit 95674f506c63 (\"nfc: llcp:\nreject PDUs shorter than the LLCP header\") did for the two-byte header,\nso the sequence byte is present and linear before it is read. RR and RNR\nPDUs are LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE bytes and an I PDU is\nlonger, so no valid frame is rejected; a truncated PDU is malformed, so\nreturn without a DM reply."
          }
        ],
        "id": "CVE-2026-98482",
        "lastModified": "2026-10-19T10:18:59.507",
        "metrics": {},
        "published": "2026-10-18T16:16:58.817",
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          },
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            "url": "https://git.kernel.org/stable/c/9b4086eb67a9a3b1ce69fef1b6793827363703ce"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T03:01:27+00:00",
      "cve": "CVE-2026-98482",
      "id": "CVE-2026-98482",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_not_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98482.json",
      "version": "3"
    }
  }
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.