Bug 2464500 (CVE-2026-31764)

Summary: CVE-2026-31764 kernel: iio: imu: st_lsm6dsx: Set buffer sampling frequency for accelerometer only
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `st_lsm6dsx` Industrial I/O (IIO) Inertial Measurement Unit (IMU) driver. A local user can trigger an out-of-bounds access by writing to the buffer sampling frequency sysfs attribute. This occurs when the `st_lsm6dsx_check_odr()` function attempts to access an array with an index derived from an unsupported sensor ID, leading to memory corruption. The most significant impact of this flaw is a denial of service (DoS), which could lead to system instability.
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Description OSIDB Bzimport 2026-05-01 15:10:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

iio: imu: st_lsm6dsx: Set buffer sampling frequency for accelerometer only

The st_lsm6dsx_hwfifo_odr_store() function, which is called when userspace
writes the buffer sampling frequency sysfs attribute, calls
st_lsm6dsx_check_odr(), which accesses the odr_table array at index
`sensor->id`; since this array is only 2 entries long, an access for any
sensor type other than accelerometer or gyroscope is an out-of-bounds
access.

The motivation for being able to set a buffer frequency different from the
sensor sampling frequency is to support use cases that need accurate event
detection (which requires a high sampling frequency) while retrieving
sensor data at low frequency. Since all the supported event types are
generated from acceleration data only, do not create the buffer sampling
frequency attribute for sensor types other than the accelerometer.
Comment 1 Keith Grant 2026-05-01 22:46:51 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050146-CVE-2026-31764-8607@gregkh/T