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CVE-2026-81017: platform/chrome: sensorhub: Bound the EC-reported sensor number

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: platform/chrome: sensorhub: Bound the EC-reported sensor number Each EC FIFO event carries an 8-bit sensor number (in->sensor_num). cros_ec_sensorhub_ring_handler() validates the FIFO event count, the per-read count and the ring bound, but not the sensor number, which cros_ec_sensor_ring_process_event() then uses unchecked to index sensorhub->batch_state[] - allocated with only sensorhub->sensor_num entries. A sensor number of sensor_num or larger is an out-of-bounds read and write of batch_state[]. Validate the sensor number in the ring handler, where each event is read from the EC, and drop a malformed event before it is used.

Affected products

• Linux kernel: 5.7 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2b602ecf6193ecb9720c78b6728d7e09370b1ff1
• https://git.kernel.org/stable/c/324880f94ba3c6269a607e04f78a4dd4a66b3f53
• https://git.kernel.org/stable/c/3a76b87e1d065183e2e7ae5b800cb1f6e84f543d
• https://git.kernel.org/stable/c/3d2636dce0a8fe9eecad29010699847be425dc80
• https://git.kernel.org/stable/c/4d9bf63ed74f859c6698bc01d8fb216ef9253867
• https://git.kernel.org/stable/c/5eaf7faa99578ae090030d1e2e6ea3b37a615496
• https://git.kernel.org/stable/c/833740a2333c2e4db4e02e3d0ffba04e8718a5f3
• https://git.kernel.org/stable/c/d1b4add68dabfdd6481a4fa198bf3b473d2634d7

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