{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23178",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-23178"
  ],
  "published": "2026-02-14T16:28:50Z",
  "summary": "HID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report()\n\n`i2c_hid_xfer` is used to read `recv_len + sizeof(__le16)` bytes of data\ninto `ihid->rawbuf`.\n\nThe former can come from the userspace in the hidraw driver and is only\nbounded by HID_MAX_BUFFER_SIZE(16384) by default (unless we also set\n`max_buffer_size` field of `struct hid_ll_driver` which we do not).\n\nThe latter has size determined at runtime by the maximum size of\ndifferent report types you could receive on any particular device and\ncan be a much smaller value.\n\nFix this by truncating `recv_len` to `ihid->bufsize - sizeof(__le16)`.\n\nThe impact is low since access to hidraw devices requires root.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-23178"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f9c9ad89d845f88a1509e9d672f65d234425fde9"
    },
    {
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      "url": "https://git.kernel.org/stable/c/cff3f619fd1cb40cdd89971df9001f075613d219"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/786ec171788bdf9dda38789163f1b1fbb47f2d1e"
    },
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      "url": "https://git.kernel.org/stable/c/2124279f1f8c32c1646ce98e75a1a39b23b7db76"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2497ff38c530b1af0df5130ca9f5ab22c5e92f29"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is triggered through the hidraw ioctl interface (/dev/hidrawN), requiring local system access to open the device file and issue an ioctl. I2C-HID devices are locally attached hardware (touchpads, touchscreens).\nAC:L - The attacker simply opens a hidraw device and issues a HIDIOCGFEATURE/HIDIOCGINPUT ioctl with a large size parameter. No race condition, special memory layout, or non-default configuration is needed to trigger the overflow.\nPR:L - While hidraw devices default to 0600 root:root, on desktop Linux systems with systemd/logind, udev uaccess rules grant some hidraw device access to the physically logged-in user without root privileges. On shared workstations or kiosks, a non-root user could trigger this.\nUI:N - No user interaction is required. The attacker opens the hidraw device file and issues the ioctl directly.\nS:U - The vulnerability is in the kernel and the impact (heap corruption) affects the kernel itself. No security boundary crossing (like VM escape) occurs.\nC:H - This is a heap buffer overflow of up to ~16KB past the allocated buffer. Heap corruption of this magnitude can be leveraged to read adjacent kernel heap objects, potentially disclosing sensitive kernel memory.\nI:H - The out-of-bounds write corrupts adjacent kernel heap objects. While the overflow content comes from the I2C device rather than being directly attacker-controlled, a 16KB heap overflow can corrupt critical kernel data structures, potentially enabling code execution through heap grooming techniques.\nA:H - A heap buffer overflow of up to ~16KB will corrupt adjacent kernel heap objects, reliably causing kernel crashes (oops/panic) from corrupted metadata or invalid pointer dereferences."
    }
  }
}