CVE-2026-63915 (GCVE-0-2026-63915)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-08-05 12:37
VLAI
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.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8b8d2e08bf0d50193931afd27482a59376b66b2b , < ed6d5d97dad0334a7f43d218753429cbe2f70a4f (git)
Affected: 8b8d2e08bf0d50193931afd27482a59376b66b2b , < b99366d74b535d0cadb1ef73e04639415d9ff3b7 (git)
Affected: 8b8d2e08bf0d50193931afd27482a59376b66b2b , < 37382293f174b82a0616c8295e32b1fc8e13d1ed (git)
Affected: 8b8d2e08bf0d50193931afd27482a59376b66b2b , < c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98 (git)
Affected: 8b8d2e08bf0d50193931afd27482a59376b66b2b , < 1905f5ec3641b2b234bb63549c8ca11ab85466eb (git)
Affected: 8b8d2e08bf0d50193931afd27482a59376b66b2b , < 22d41b176b9989efd21c3b2d3abf6728f05b9d9a (git)
Affected: 8b8d2e08bf0d50193931afd27482a59376b66b2b , < 83b1362edc9d6ae376c6f36da116e2c70f2e70a6 (git)
Affected: 8b8d2e08bf0d50193931afd27482a59376b66b2b , < f040e590c035bfd9553fe79ee9585caf1b14d67b (git)
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Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: hci: fix out-of-bounds read in HCP header parsing\n\nBoth nfc_hci_recv_from_llc() and nci_hci_data_received_cb() read\npacket-\u003eheader from skb-\u003edata at function entry without first checking\nthat the buffer holds at least one byte. A malicious NFC peer can send\na 0-byte HCP frame that passes through the SHDLC layer and reaches\nthese functions, causing an out-of-bounds heap read of packet-\u003eheader.\nThe same 0-byte frame, if queued as a non-final fragment, also causes\nthe reassembly loop to underflow msg_len to UINT_MAX, triggering\nskb_over_panic() when the reassembled skb is written.\n\nFix this by adding a pskb_may_pull() check at the entry of each\nfunction before packet-\u003eheader is first accessed. The existing\npskb_may_pull() checks before the reassembled hcp_skb is cast to\nstruct hcp_packet remain in place to guard the 2-byte HCP message\nheader."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:A - The bug is triggered by malformed HCP frames from a malicious NFC peer over the RF link; NFC is a proximity wireless medium analogous to Bluetooth, requiring the attacker to be within NFC range (~4 cm) of the victim device.\nAC:L - An attacker with commodity NFC hardware can reliably send a 0-byte HCP frame (or fragment sequence) to trigger the out-of-bounds read and the msg_len integer underflow that leads to skb_over_panic(), with no race or special memory layout required.\nPR:N - Exploitation requires no privileges on the victim system; inbound frames are processed in kernel driver/workqueue context with no authentication, and the attacker only needs an active NFC RF session with the victim\u0027s controller.\nUI:N - On typical NFC-enabled deployments (Android phones, payment terminals, transit readers), the victim does not need to perform a deliberate administrative action beyond having NFC radio active while an attacker initiates proximity communication.\nS:U - Impact is confined to kernel memory and availability on the victim host; it does not cross a VM, container, or IOMMU security boundary.\nC:H - The vulnerable code dereferences packet-\u003eheader from skb-\u003edata on a zero-length skb, causing an out-of-bounds heap read of at least one byte of adjacent kernel memory.\nI:H - The fragment-reassembly path underflows msg_len when processing zero-length fragments, passing a wrapped length to skb_put_data() and attempting a massive kernel buffer write before panic; combined with the heap out-of-bounds read, this is kernel memory corruption with potential for further exploitation.\nA:H - The integer underflow in HCP fragment reassembly reliably triggers skb_over_panic() (kernel BUG/panic), causing complete loss of kernel availability on affected systems."
            }
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        }
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        "dateUpdated": "2026-08-05T12:37:09.414Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/ed6d5d97dad0334a7f43d218753429cbe2f70a4f"
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          "url": "https://git.kernel.org/stable/c/b99366d74b535d0cadb1ef73e04639415d9ff3b7"
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          "url": "https://git.kernel.org/stable/c/37382293f174b82a0616c8295e32b1fc8e13d1ed"
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      "title": "nfc: hci: fix out-of-bounds read in HCP header parsing",
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    "cveId": "CVE-2026-63915",
    "datePublished": "2026-07-19T14:55:19.305Z",
    "dateReserved": "2026-07-19T07:54:57.020Z",
    "dateUpdated": "2026-08-05T12:37:09.414Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: hci: fix out-of-bounds read in HCP header parsing\n\nBoth nfc_hci_recv_from_llc() and nci_hci_data_received_cb() read\npacket-\u003eheader from skb-\u003edata at function entry without first checking\nthat the buffer holds at least one byte. A malicious NFC peer can send\na 0-byte HCP frame that passes through the SHDLC layer and reaches\nthese functions, causing an out-of-bounds heap read of packet-\u003eheader.\nThe same 0-byte frame, if queued as a non-final fragment, also causes\nthe reassembly loop to underflow msg_len to UINT_MAX, triggering\nskb_over_panic() when the reassembled skb is written.\n\nFix this by adding a pskb_may_pull() check at the entry of each\nfunction before packet-\u003eheader is first accessed. The existing\npskb_may_pull() checks before the reassembled hcp_skb is cast to\nstruct hcp_packet remain in place to guard the 2-byte HCP message\nheader."
          }
        ],
        "id": "CVE-2026-63915",
        "lastModified": "2026-07-27T17:44:23.777",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-07-19T16:17:09.517",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1905f5ec3641b2b234bb63549c8ca11ab85466eb"
          },
          {
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            "url": "https://git.kernel.org/stable/c/22d41b176b9989efd21c3b2d3abf6728f05b9d9a"
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            "url": "https://git.kernel.org/stable/c/37382293f174b82a0616c8295e32b1fc8e13d1ed"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/83b1362edc9d6ae376c6f36da116e2c70f2e70a6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b99366d74b535d0cadb1ef73e04639415d9ff3b7"
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            "url": "https://git.kernel.org/stable/c/c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98"
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            "url": "https://git.kernel.org/stable/c/f040e590c035bfd9553fe79ee9585caf1b14d67b"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-22T03:09:19+00:00",
      "cve": "CVE-2026-63915",
      "id": "CVE-2026-63915",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfc: hci: fix out-of-bounds read in HCP header parsing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63915.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T02:30:23Z",
      "cve": "CVE-2026-63915",
      "id": "CVE-2026-63915",
      "initial_release_date": "2026-07-21T13:03:39Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "617",
      "product_status:known_not_affected": "79",
      "product_status:recommended": "273",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63915",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63915.json",
      "version": "14"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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.