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iio: gyro: itg3200: fix i2c read into the wrong stack location

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: iio: gyro: itg3200: fix i2c read into the wrong stack location itg3200_read_all_channels() takes `__be16 *buf' as a parameter and fills the i2c_msg destination as `(char *)&buf'. Since `buf' is the parameter (a pointer), `&buf' is the address of the local pointer slot on the stack of itg3200_read_all_channels(), not the address of the caller's scan buffer. The (char *) cast hides the type mismatch. i2c_transfer() therefore writes ITG3200_SCAN_ELEMENTS * sizeof(s16) = 8 bytes into the parameter's stack slot, which is discarded when the function returns. The caller's scan buffer in itg3200_trigger_handler() is never written to, so iio_push_to_buffers_with_timestamp() pushes uninitialised stack contents to userspace via /dev/iio:deviceX every scan -- both a functional bug (no actual gyroscope or temperature data is delivered through the triggered buffer) and an information leak. The non-buffered read_raw() path is unaffected: it goes through itg3200_read_reg_s16() which uses `&out' on a local s16 value, where that is correct. Drop the spurious `&' so the i2c read writes into the caller's buffer.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.259, 5.15.210, 6.1.176, 6.12.93, 6.18.35, 6.6.143, 7.0.12
CVEs
CVE-2026-63934
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 22:39 UTC · Revision 1

Source evidence

iio: gyro: itg3200: fix i2c read into the wrong stack location

core-osv · Original source

Published 19 Jul 2026, 14:55 UTC

In the Linux kernel, the following vulnerability has been resolved: iio: gyro: itg3200: fix i2c read into the wrong stack location itg3200_read_all_channels() takes `__be16 *buf' as a parameter and fills the i2c_msg destination as `(char *)&buf'. Since `buf' is the parameter (a pointer), `&buf' is the address of the local pointer slot on the stack of itg3200_read_all_channels(), not the address of the caller's scan buffer. The (char *) cast hides the type mismatch. i2c_transfer() therefore writes ITG3200_SCAN_ELEMENTS * sizeof(s16) = 8 bytes into the parameter's stack slot, which is discarded when the function returns. The caller's scan buffer in itg3200_trigger_handler() is never written to, so iio_push_to_buffers_with_timestamp() pushes uninitialised stack contents to userspace via /dev/iio:deviceX every scan -- both a functional bug (no actual gyroscope or temperature data is delivered through the triggered buffer) and an information leak. The non-buffered read_raw() path is unaffected: it goes through itg3200_read_reg_s16() which uses `&out' on a local s16 value, where that is correct. Drop the spurious `&' so the i2c read writes into the caller's buffer.

osv:CVE-2026-63934

Kernel

Fixed versions: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12

Complete source record
{
  "id": "98572eb086110ad54fb8e7b51875b6d92bc44364f6d2dc197ca48f194fbbe7d4",
  "url": "https://osv.dev/vulnerability/CVE-2026-63934",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iio: gyro: itg3200: fix i2c read into the wrong stack location",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: iio: gyro: itg3200: fix i2c read into the wrong stack location itg3200_read_all_channels() takes `__be16 *buf' as a parameter and fills the i2c_msg destination as `(char *)&buf'. Since `buf' is the parameter (a pointer), `&buf' is the address of the local pointer slot on the stack of itg3200_read_all_channels(), not the address of the caller's scan buffer. The (char *) cast hides the type mismatch. i2c_transfer() therefore writes ITG3200_SCAN_ELEMENTS * sizeof(s16) = 8 bytes into the parameter's stack slot, which is discarded when the function returns. The caller's scan buffer in itg3200_trigger_handler() is never written to, so iio_push_to_buffers_with_timestamp() pushes uninitialised stack contents to userspace via /dev/iio:deviceX every scan -- both a functional bug (no actual gyroscope or temperature data is delivered through the triggered buffer) and an information leak. The non-buffered read_raw() path is unaffected: it goes through itg3200_read_reg_s16() which uses `&out' on a local s16 value, where that is correct. Drop the spurious `&' so the i2c read writes into the caller's buffer.",
    "evidence": "osv:CVE-2026-63934",
    "products": [
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          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "value": "5.15.210",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.93",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.35",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
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      "aliases": [
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      "affected": [
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              "type": "ECOSYSTEM",
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                  "introduced": "3.9.0"
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                  "fixed": "5.10.259"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
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            {
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                  "introduced": "5.16.0"
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            {
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                  "introduced": "6.13.0"
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            {
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          "database_specific": {
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          }
        }
      ],
      "modified": "2026-11-01T02:30:48.724823621Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/15a0b3f33ffb6c78b3de6f69b026ceb09b973dd1",
        "https://git.kernel.org/stable/c/31bbd4b87dd6701fa10e03ba7f6268e49e178d16",
        "https://git.kernel.org/stable/c/63203bd072b613c18c237b906b1c9d2dc4527337",
        "https://git.kernel.org/stable/c/6bdc3023d62ed5c7d591f0eb27a5adb37fb892ae",
        "https://git.kernel.org/stable/c/8654b5e2617819ff4f7c78071dfd0275e971a9b6",
        "https://git.kernel.org/stable/c/90e809376b0f0d1ddec2eec954aecdd2a5b40b0e",
        "https://git.kernel.org/stable/c/b64dd5f3b38911054cbcc570df617e3e8e75e562",
        "https://git.kernel.org/stable/c/cfc3283859cfdeacadf80d5e6880bdf871ffeaa6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63934.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63934",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63934.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-63934",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490618,
  "published_at": "2026-07-19T14:55:32.681+00:00"
}