CVE-2026-63934 (GCVE-0-2026-63934)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55
VLAI
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9dbf091da080508e9f632d307f357beb79a0766b , < 90e809376b0f0d1ddec2eec954aecdd2a5b40b0e (git)
Affected: 9dbf091da080508e9f632d307f357beb79a0766b , < 8654b5e2617819ff4f7c78071dfd0275e971a9b6 (git)
Affected: 9dbf091da080508e9f632d307f357beb79a0766b , < b64dd5f3b38911054cbcc570df617e3e8e75e562 (git)
Affected: 9dbf091da080508e9f632d307f357beb79a0766b , < 31bbd4b87dd6701fa10e03ba7f6268e49e178d16 (git)
Affected: 9dbf091da080508e9f632d307f357beb79a0766b , < 63203bd072b613c18c237b906b1c9d2dc4527337 (git)
Affected: 9dbf091da080508e9f632d307f357beb79a0766b , < 15a0b3f33ffb6c78b3de6f69b026ceb09b973dd1 (git)
Affected: 9dbf091da080508e9f632d307f357beb79a0766b , < cfc3283859cfdeacadf80d5e6880bdf871ffeaa6 (git)
Affected: 9dbf091da080508e9f632d307f357beb79a0766b , < 6bdc3023d62ed5c7d591f0eb27a5adb37fb892ae (git)
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Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (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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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: gyro: itg3200: fix i2c read into the wrong stack location\n\nitg3200_read_all_channels() takes `__be16 *buf\u0027 as a parameter and\nfills the i2c_msg destination as `(char *)\u0026buf\u0027. Since `buf\u0027 is the\nparameter (a pointer), `\u0026buf\u0027 is the address of the local pointer\nslot on the stack of itg3200_read_all_channels(), not the address\nof the caller\u0027s scan buffer. The (char *) cast hides the type\nmismatch.\n\ni2c_transfer() therefore writes ITG3200_SCAN_ELEMENTS * sizeof(s16)\n= 8 bytes into the parameter\u0027s stack slot, which is discarded when\nthe function returns. The caller\u0027s scan buffer in\nitg3200_trigger_handler() is never written to, so\niio_push_to_buffers_with_timestamp() pushes uninitialised stack\ncontents to userspace via /dev/iio:deviceX every scan -- both a\nfunctional bug (no actual gyroscope or temperature data is\ndelivered through the triggered buffer) and an information leak.\n\nThe non-buffered read_raw() path is unaffected: it goes through\nitg3200_read_reg_s16() which uses `\u0026out\u0027 on a local s16 value,\nwhere that is correct.\n\nDrop the spurious `\u0026\u0027 so the i2c read writes into the caller\u0027s\nbuffer."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "dateReserved": "2026-07-19T07:54:57.022Z",
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The caller\u0027s scan buffer in\\nitg3200_trigger_handler() is never written to, so\\niio_push_to_buffers_with_timestamp() pushes uninitialised stack\\ncontents to userspace via /dev/iio:deviceX every scan -- both a\\nfunctional bug (no actual gyroscope or temperature data is\\ndelivered through the triggered buffer) and an information leak.\\n\\nThe non-buffered read_raw() path is unaffected: it goes through\\nitg3200_read_reg_s16() which uses `\u0026out\u0027 on a local s16 value,\\nwhere that is correct.\\n\\nDrop the spurious `\u0026\u0027 so the i2c read writes into the caller\u0027s\\nbuffer.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/iio/gyro/itg3200_buffer.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9dbf091da080508e9f632d307f357beb79a0766b\",\"lessThan\":\"90e809376b0f0d1ddec2eec954aecdd2a5b40b0e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9dbf091da080508e9f632d307f357beb79a0766b\",\"lessThan\":\"8654b5e2617819ff4f7c78071dfd0275e971a9b6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9dbf091da080508e9f632d307f357beb79a0766b\",\"lessThan\":\"b64dd5f3b38911054cbcc570df617e3e8e75e562\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9dbf091da080508e9f632d307f357beb79a0766b\",\"lessThan\":\"31bbd4b87dd6701fa10e03ba7f6268e49e178d16\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9dbf091da080508e9f632d307f357beb79a0766b\",\"lessThan\":\"63203bd072b613c18c237b906b1c9d2dc4527337\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9dbf091da080508e9f632d307f357beb79a0766b\",\"lessThan\":\"15a0b3f33ffb6c78b3de6f69b026ceb09b973dd1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9dbf091da080508e9f632d307f357beb79a0766b\",\"lessThan\":\"cfc3283859cfdeacadf80d5e6880bdf871ffeaa6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9dbf091da080508e9f632d307f357beb79a0766b\",\"lessThan\":\"6bdc3023d62ed5c7d591f0eb27a5adb37fb892ae\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/iio/gyro/itg3200_buffer.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/15a0b3f33ffb6c78b3de6f69b026ceb09b973dd1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/31bbd4b87dd6701fa10e03ba7f6268e49e178d16\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/63203bd072b613c18c237b906b1c9d2dc4527337\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6bdc3023d62ed5c7d591f0eb27a5adb37fb892ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8654b5e2617819ff4f7c78071dfd0275e971a9b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/90e809376b0f0d1ddec2eec954aecdd2a5b40b0e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b64dd5f3b38911054cbcc570df617e3e8e75e562\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cfc3283859cfdeacadf80d5e6880bdf871ffeaa6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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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.


Detection rules are retrieved from Rulezet.