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nfc: hci: fix out-of-bounds read in HCP header parsing

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: nfc: hci: fix out-of-bounds read in HCP header parsing Both nfc_hci_recv_from_llc() and nci_hci_data_received_cb() read packet->header from skb->data at function entry without first checking that the buffer holds at least one byte. A malicious NFC peer can send a 0-byte HCP frame that passes through the SHDLC layer and reaches these functions, causing an out-of-bounds heap read of packet->header. The same 0-byte frame, if queued as a non-final fragment, also causes the reassembly loop to underflow msg_len to UINT_MAX, triggering skb_over_panic() when the reassembled skb is written. Fix this by adding a pskb_may_pull() check at the entry of each function before packet->header is first accessed. The existing pskb_may_pull() checks before the reassembled hcp_skb is cast to struct hcp_packet remain in place to guard the 2-byte HCP message header.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.259, 5.15.210, 6.1.176, 6.12.93, 6.18.35, 6.6.143, 7.0.12
CVEs
CVE-2026-63915
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 17:38 UTC · Revision 1

Source evidence

nfc: hci: fix out-of-bounds read in HCP header parsing

core-osv · Original source

Published 19 Jul 2026, 14:55 UTC

In the Linux kernel, the following vulnerability has been resolved: nfc: hci: fix out-of-bounds read in HCP header parsing Both nfc_hci_recv_from_llc() and nci_hci_data_received_cb() read packet->header from skb->data at function entry without first checking that the buffer holds at least one byte. A malicious NFC peer can send a 0-byte HCP frame that passes through the SHDLC layer and reaches these functions, causing an out-of-bounds heap read of packet->header. The same 0-byte frame, if queued as a non-final fragment, also causes the reassembly loop to underflow msg_len to UINT_MAX, triggering skb_over_panic() when the reassembled skb is written. Fix this by adding a pskb_may_pull() check at the entry of each function before packet->header is first accessed. The existing pskb_may_pull() checks before the reassembled hcp_skb is cast to struct hcp_packet remain in place to guard the 2-byte HCP message header.

osv:CVE-2026-63915

Kernel

Fixed versions: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12

Complete source record
{
  "id": "08f22873f924bbf191240d9fdcce6932ea51af0c663421e7e53035bf39425398",
  "url": "https://osv.dev/vulnerability/CVE-2026-63915",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nfc: hci: fix out-of-bounds read in HCP header parsing",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: nfc: hci: fix out-of-bounds read in HCP header parsing Both nfc_hci_recv_from_llc() and nci_hci_data_received_cb() read packet->header from skb->data at function entry without first checking that the buffer holds at least one byte. A malicious NFC peer can send a 0-byte HCP frame that passes through the SHDLC layer and reaches these functions, causing an out-of-bounds heap read of packet->header. The same 0-byte frame, if queued as a non-final fragment, also causes the reassembly loop to underflow msg_len to UINT_MAX, triggering skb_over_panic() when the reassembled skb is written. Fix this by adding a pskb_may_pull() check at the entry of each function before packet->header is first accessed. The existing pskb_may_pull() checks before the reassembled hcp_skb is cast to struct hcp_packet remain in place to guard the 2-byte HCP message header.",
    "evidence": "osv:CVE-2026-63915",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.259",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.210",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.176",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.143",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.93",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.35",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-63915",
      "aliases": [
        "CVE-2026-63915"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8b8d2e08bf0d50193931afd27482a59376b66b2b"
                },
                {
                  "fixed": "ed6d5d97dad0334a7f43d218753429cbe2f70a4f"
                },
                {
                  "fixed": "b99366d74b535d0cadb1ef73e04639415d9ff3b7"
                },
                {
                  "fixed": "37382293f174b82a0616c8295e32b1fc8e13d1ed"
                },
                {
                  "fixed": "c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98"
                },
                {
                  "fixed": "1905f5ec3641b2b234bb63549c8ca11ab85466eb"
                },
                {
                  "fixed": "22d41b176b9989efd21c3b2d3abf6728f05b9d9a"
                },
                {
                  "fixed": "83b1362edc9d6ae376c6f36da116e2c70f2e70a6"
                },
                {
                  "fixed": "f040e590c035bfd9553fe79ee9585caf1b14d67b"
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              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63915.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.5.0"
                },
                {
                  "fixed": "5.10.259"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.210"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.176"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.143"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.93"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.35"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.12"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63915.json"
          }
        }
      ],
      "modified": "2026-11-01T02:30:37.185713365Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1905f5ec3641b2b234bb63549c8ca11ab85466eb",
        "https://git.kernel.org/stable/c/22d41b176b9989efd21c3b2d3abf6728f05b9d9a",
        "https://git.kernel.org/stable/c/37382293f174b82a0616c8295e32b1fc8e13d1ed",
        "https://git.kernel.org/stable/c/83b1362edc9d6ae376c6f36da116e2c70f2e70a6",
        "https://git.kernel.org/stable/c/b99366d74b535d0cadb1ef73e04639415d9ff3b7",
        "https://git.kernel.org/stable/c/c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98",
        "https://git.kernel.org/stable/c/ed6d5d97dad0334a7f43d218753429cbe2f70a4f",
        "https://git.kernel.org/stable/c/f040e590c035bfd9553fe79ee9585caf1b14d67b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63915.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63915",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63915.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-63915",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487881,
  "published_at": "2026-07-19T14:55:19.305+00:00"
}