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CVE-2026-63915

Estado: Pendiente de análisisAlta (8.8)—

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.

Leer descripción completaMostrar menos

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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vector AV:A (red adyacente) sin privilegios requeridos indica T1210. La lectura fuera de límites (out-of-bounds read) permite lectura de datos en heap (T1005); el underflow de msg_len causa panics (DoS por caída del kernel, T1499.004).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementNetwork SegmentationFilter Network TrafficDisable or Remove Feature or Program

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-63915",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b",
              "lessThan": "ed6d5d97dad0334a7f43d218753429cbe2f70a4f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b",
              "lessThan": "b99366d74b535d0cadb1ef73e04639415d9ff3b7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b",
              "lessThan": "37382293f174b82a0616c8295e32b1fc8e13d1ed",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b",
              "lessThan": "c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b",
              "lessThan": "1905f5ec3641b2b234bb63549c8ca11ab85466eb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b",
              "lessThan": "22d41b176b9989efd21c3b2d3abf6728f05b9d9a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b",
              "lessThan": "83b1362edc9d6ae376c6f36da116e2c70f2e70a6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b",
              "lessThan": "f040e590c035bfd9553fe79ee9585caf1b14d67b",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/nfc/hci/core.c",
            "net/nfc/nci/hci.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.5"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.5",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/nfc/hci/core.c",
            "net/nfc/nci/hci.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-07-19T16:17:09.517",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1905f5ec3641b2b234bb63549c8ca11ab85466eb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/22d41b176b9989efd21c3b2d3abf6728f05b9d9a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/37382293f174b82a0616c8295e32b1fc8e13d1ed",
      "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",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ed6d5d97dad0334a7f43d218753429cbe2f70a4f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f040e590c035bfd9553fe79ee9585caf1b14d67b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "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->header from skb->data 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->header.\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->header 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."
    }
  ],
  "lastModified": "2026-07-27T17:44:23.777",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}