CVE-2026-63947 (GCVE-0-2026-63947)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-08-05 12:37
VLAI
Title
Bluetooth: HIDP: fix missing length checks in hidp_input_report()
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HIDP: fix missing length checks in hidp_input_report() hidp_input_report() reads keyboard and mouse payload data from an skb without first verifying that skb->len contains enough data. hidp_recv_intr_frame() pulls the 1-byte HIDP header before dispatching to hidp_input_report(). If a paired device sends a truncated packet, the handler reads beyond the valid skb data, resulting in an out-of-bounds read of skb data. The OOB bytes may be interpreted as phantom key presses or spurious mouse movement. Replace the open-coded length tracking and pointer arithmetic with skb_pull_data() calls. skb_pull_data() returns NULL if the requested bytes are not present, eliminating the need for a manual size variable and the separate skb->len guard.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6633 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1f08a90013e1e632b34321334e861fcefc056505 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cc3832b19f863e3677c5651f001a2e3795f39eb8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d313683d6ccdd8c01e0562270a2ae25b86d8461d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d7d6a81b8dd1a8d084a1b755db9406041d53adb5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6348dfed5b0f9c6074f14322332e97493d32fef0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b83dcacd2ec7fcc5a48be215f82d573759f87ec2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2a3ac9ee11dbb9845f3947cef4a79dba658cf6f6 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (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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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
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      "cpeApplicability": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HIDP: fix missing length checks in hidp_input_report()\n\nhidp_input_report() reads keyboard and mouse payload data from an skb\nwithout first verifying that skb-\u003elen contains enough data.\n\nhidp_recv_intr_frame() pulls the 1-byte HIDP header before dispatching\nto hidp_input_report(). If a paired device sends a truncated packet,\nthe handler reads beyond the valid skb data, resulting in an\nout-of-bounds read of skb data. The OOB bytes may be interpreted as\nphantom key presses or spurious mouse movement.\n\nReplace the open-coded length tracking and pointer arithmetic with\nskb_pull_data() calls. skb_pull_data() returns NULL if the requested\nbytes are not present, eliminating the need for a manual size variable\nand the separate skb-\u003elen guard."
        }
      ],
      "metrics": [
        {
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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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The bug is reached when a connected Bluetooth HID peer sends malformed HIDP interrupt (or control DATA) frames over L2CAP ACL; packets traverse HCI \u2192 l2cap_recv_acldata() \u2192 l2cap_data_channel() \u2192 l2cap_sock_recv_cb() \u2192 HIDP session thread \u2192 hidp_recv_intr_frame()/hidp_process_data() \u2192 hidp_input_report(), which is an adjacent Bluetooth attack surface.\nAC:L - Exploitation only requires sending deliberately truncated HIDP input reports on an already-established HIDP/L2CAP session; the attacker fully controls packet length and can trigger the out-of-bounds read reliably on every malformed frame with no race or special memory layout.\nPR:N - The attacker is an external Bluetooth HID device sending L2CAP payloads and needs no Linux account, capability, or namespace privilege; CAP_NET_ADMIN is only required for bluetoothd to register the session, not for the malicious peer to deliver the crafted packets.\nUI:N - Once a HIDP session is active, exploitation is automatic from crafted Bluetooth traffic and requires no further victim action; pairing/connection is an attacker prerequisite, not user interaction at exploit time (consistent with prior Bluetooth HIDP CNA scoring such as CVE-2026-23462).\nS:U - Impact is confined to kernel HIDP/input handling and forged input events delivered within the same kernel security authority; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The vulnerable code performs out-of-bounds reads of up to eight keyboard or four mouse payload bytes beyond skb-\u003elen, and per CVSS kernel guidance any out-of-bounds read is rated High because adjacent skb tailroom may contain stale packet or kernel heap data observable through phantom key/mouse event side channels.\nI:H - Out-of-bounds bytes are interpreted as boot-protocol keyboard scancodes and mouse button/movement events, enabling phantom key presses and pointer injection into the system input layer; on laptops, kiosks, automotive consoles, and Android handsets this can forge arbitrary keystrokes/clicks against the active user session.\nA:H - Reading keyboard/mouse payload bytes past valid skb-\u003elen is undefined behavior on tightly allocated skbs with no tailroom and can fault the kernel; even when reads stay within tailroom, forged input can repeatedly disrupt session availability on shared/public Bluetooth keyboard deployments, and under the conservative scoring rule this is rated High when crash potential cannot be excluded."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:37:34.167Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/1f08a90013e1e632b34321334e861fcefc056505"
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          "url": "https://git.kernel.org/stable/c/cc3832b19f863e3677c5651f001a2e3795f39eb8"
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        {
          "url": "https://git.kernel.org/stable/c/d313683d6ccdd8c01e0562270a2ae25b86d8461d"
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          "url": "https://git.kernel.org/stable/c/d7d6a81b8dd1a8d084a1b755db9406041d53adb5"
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        {
          "url": "https://git.kernel.org/stable/c/2a3ac9ee11dbb9845f3947cef4a79dba658cf6f6"
        }
      ],
      "title": "Bluetooth: HIDP: fix missing length checks in hidp_input_report()",
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    "cveId": "CVE-2026-63947",
    "datePublished": "2026-07-19T14:55:41.306Z",
    "dateReserved": "2026-07-19T07:54:57.023Z",
    "dateUpdated": "2026-08-05T12:37:34.167Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-10-09",
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      "percentile": "0.26103"
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                "versions": [
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HIDP: fix missing length checks in hidp_input_report()\n\nhidp_input_report() reads keyboard and mouse payload data from an skb\nwithout first verifying that skb-\u003elen contains enough data.\n\nhidp_recv_intr_frame() pulls the 1-byte HIDP header before dispatching\nto hidp_input_report(). If a paired device sends a truncated packet,\nthe handler reads beyond the valid skb data, resulting in an\nout-of-bounds read of skb data. The OOB bytes may be interpreted as\nphantom key presses or spurious mouse movement.\n\nReplace the open-coded length tracking and pointer arithmetic with\nskb_pull_data() calls. skb_pull_data() returns NULL if the requested\nbytes are not present, eliminating the need for a manual size variable\nand the separate skb-\u003elen guard."
          }
        ],
        "id": "CVE-2026-63947",
        "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": "2026-07-19T16:17:13.337",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1f08a90013e1e632b34321334e861fcefc056505"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2a3ac9ee11dbb9845f3947cef4a79dba658cf6f6"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6348dfed5b0f9c6074f14322332e97493d32fef0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b83dcacd2ec7fcc5a48be215f82d573759f87ec2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cc3832b19f863e3677c5651f001a2e3795f39eb8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d313683d6ccdd8c01e0562270a2ae25b86d8461d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d7d6a81b8dd1a8d084a1b755db9406041d53adb5"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-23T03:35:37+00:00",
      "cve": "CVE-2026-63947",
      "id": "CVE-2026-63947",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: HIDP: fix missing length checks in hidp_input_report()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63947.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-08T23:58:50Z",
      "cve": "CVE-2026-63947",
      "id": "CVE-2026-63947",
      "initial_release_date": "2026-07-21T13:02:58Z",
      "product_status:known_affected": "677",
      "product_status:known_not_affected": "75",
      "product_status:recommended": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63947",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63947.json",
      "version": "16"
    }
  }
}



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Tags
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.



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.