# CVE-2026-78116: Broadcom AFBR-S50 sensor driver double-completion of RTIO submission

Source: https://junglewise.ai/threats/cve-2026-78116-the-broadcom-afbr-s50-time-of-flight-sensor-driver-double  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-21. Updated: 2026-10-21  
License: CC BY 4.0 with a link back

CVE-2026-78116 · Severity: medium · CVSS 5.2 · Published 2026-10-21

The Broadcom AFBR-S50 time-of-flight sensor driver used in embedded devices can be triggered by ambient light or sensor conditions to double-complete a data request, corrupting the system's submission queue and memory pools. This causes the device to write sensor data to already-freed memory buffers and deliver duplicate results to applications, leading to memory corruption and system instability or unavailability.

Vendors: [Broadcom](https://junglewise.ai/threats/vendors/broadcom).

## Quick answers

**Is CVE-2026-78116 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-78116 being exploited in the wild.

**How severe is CVE-2026-78116?** Medium severity, with a CVSS score of 5.2, published 21 October 2026.

**Which products and versions are affected?** Broadcom AFBR-S50 sensor driver releases before payload.Status check correction.

**Is there a fix for CVE-2026-78116?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-78116 attacked?** It is attacked from the adjacent network, in device firmware.

**Am I affected by CVE-2026-78116?** Check whether you run Broadcom AFBR-S50 sensor driver at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a missing return statement in the error handling path of data_ready_work_handler() in the AFBR-S50 driver. When Argus_EvaluateData() fails, the function calls rtio_iodev_sqe_err() to complete the request but then falls through and calls rtio_iodev_sqe_ok() on the same submission, causing double-completion. Both calls invoke rtio_executor_done(), which frees the submission pool entry and releases RX buffers for streaming submissions, leading to corruption of the RTIO submission pool and subsequent writes through freed memory.

## Affected products

- Broadcom AFBR-S50 sensor driver releases before payload.Status check correction

## Timeline

- 2026-10-21: disclosed