CVE-2026-63947 (GCVE-0-2026-63947)
Vulnerability from cvelistv5
Published
2026-07-19 14:55
Modified
2026-08-05 12:37
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hidp/core.c"
          ],
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          "vendor": "Linux",
          "versions": [
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        {
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "2.6.12"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.210",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.176",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1f08a90013e1e632b34321334e861fcefc056505"
        },
        {
          "url": "https://git.kernel.org/stable/c/cc3832b19f863e3677c5651f001a2e3795f39eb8"
        },
        {
          "url": "https://git.kernel.org/stable/c/d313683d6ccdd8c01e0562270a2ae25b86d8461d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7d6a81b8dd1a8d084a1b755db9406041d53adb5"
        },
        {
          "url": "https://git.kernel.org/stable/c/6348dfed5b0f9c6074f14322332e97493d32fef0"
        },
        {
          "url": "https://git.kernel.org/stable/c/b83dcacd2ec7fcc5a48be215f82d573759f87ec2"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a3ac9ee11dbb9845f3947cef4a79dba658cf6f6"
        }
      ],
      "title": "Bluetooth: HIDP: fix missing length checks in hidp_input_report()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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