{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74507",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74507"
  ],
  "published": "2026-08-15T12:28:42Z",
  "summary": "Bluetooth: HIDP: validate numbered report payloads",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HIDP: validate numbered report payloads\n\nWhen hidp_get_raw_report() waits for a numbered report,\nhidp_process_data() compares the expected report number with skb->data[0].\nA connected HIDP peer can reply with only a DATA transaction header,\nleaving the skb empty after the header is removed.\n\nKMSAN reports an uninitialized-value use in hidp_session_run(), with the\nvalue originating in __alloc_skb() through vhci_write(). The transaction\nheader checks remove the empty-frame reports, but this report remains until\nthe payload check is added.\n\nThe comparison can also consume a peer-controlled byte beyond the declared\nL2CAP PDU. A DATA | FEATURE response followed by an extra 0x01 byte made\nthe current code accept that byte as report ID 1 and complete\nHIDIOCGFEATURE with a zero-byte result. With this change the malformed\nresponse is rejected with -EIO, while a subsequent valid response still\nsucceeds.\n\nRequire a payload byte before comparing a numbered report ID. Unnumbered\nreports continue to accept an empty payload.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"
    }
  ],
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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74507"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/011bf4350d941f1995b2bd4b815ee206cacf2b8e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/689d8bb7fee96b7196b572b015b6055c6616ce0c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c73beb320f5705e508bf7d385b8cc5ef8d9c8b69"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b7ad105d46acd828e424454815e4cd31069e047a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7e7162427659b70ea17cd41b1f79e2e64c246690"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/27cc0e603355c585f1e5da8398faa4d36d498188"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9c841f59e10b5d75c398a3fc6b2da448d2a2276b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/34f53d27b81a16a02828c8fdfa4e02badc326f17"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The flaw is reached when a connected Bluetooth HIDP peer sends crafted DATA frames over the established L2CAP control channel; Bluetooth is an adjacent wireless vector, not local syscall/ioctl or physical USB access.\nAC:L - The malicious peer receives the host GET_REPORT and can deterministically reply with a header-only DATA frame or a malformed numbered-report payload; no race or rare layout conditions beyond an active HIDP session are required.\nPR:N - Exploitation is performed by the remote Bluetooth HIDP peer sending malicious protocol data; the attacker needs no local account, capabilities, or init-namespace root on the victim host.\nUI:N - Once a HIDP session exists, the peer can trigger the bug by answering host-initiated GET_REPORT requests from HIDIOCGFEATURE or kernel HID probe I/O without any additional victim action at exploit time.\nS:U - Impact is confined to kernel Bluetooth HIDP/hidraw handling on the victim host; it does not cross a VM, container, or IOMMU security boundary to affect a separate authority.\nC:H - With numbered reports, hidp_process_data() reads skb->data[0] when skb->len is zero or beyond the declared L2CAP PDU, causing an out-of-bounds/uninitialized heap read that may contain stale kernel memory.\nI:L - Accepting malformed numbered-report responses can complete HIDIOCGFEATURE with incorrect zero-length or attacker-chosen report-ID data, causing limited integrity impact on returned HID feature-report contents.\nA:N - The defect is an invalid payload-length check and uninitialized/OOB read during report matching; it does not cause a documented kernel oops, panic, hang, or repeatable denial of service."
    }
  }
}