# CVE-2026-75084: CC1200 sub-GHz IEEE 802.15.4 driver buffer overflow in RX packet parsing

Source: https://junglewise.ai/threats/cve-2026-75084-the-cc1200-sub-ghz-ieee-802-15-4-driver-takes-the-phy-packet  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-75084 · Severity: medium · CVSS 6.8 · Published 2026-10-14

The CC1200 sub-GHz radio driver in Zephyr OS improperly validates packet length fields received over the air, allowing an attacker within radio range to trigger a buffer overflow. An unauthenticated attacker can transmit a specially crafted frame with an invalid length byte that causes the driver to write beyond allocated memory in the network buffer pool, leading to memory corruption and system crashes.

Technologies: [Zephyr Project Zephyr OS](https://junglewise.ai/threats/technologies/zephyr-os). Vendors: [Zephyr Project](https://junglewise.ai/threats/vendors/zephyr-project).

## Quick answers

**Is CVE-2026-75084 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75084 being exploited in the wild.

**How severe is CVE-2026-75084?** Medium severity, with a CVSS score of 6.8, published 14 October 2026.

**Which products and versions are affected?** Zephyr Project Zephyr OS versions with CONFIG_IEEE802154_CC1200 enabled.

**Is there a fix for CVE-2026-75084?** 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-2026-75084 attacked?** It is attacked over the network or from the adjacent network, in an operating system.

**Am I affected by CVE-2026-75084?** Check whether you run Zephyr Project Zephyr OS 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 driver reads the PHY packet length from the first byte of the RX FIFO (0–255) but validates only a lower bound (< 3 bytes), failing to clamp values above the IEEE 802.15.4 maximum of 127. A single SPI burst read of the unclamped length writes past the end of a 128-byte network buffer fragment, leaving the buffer's length metadata inconsistent with its capacity. The overflow is triggered remotely without authentication or user interaction and depends only on RF timing; overflowed data is FIFO underflow output, resulting in network buffer pool corruption and DoS rather than controlled arbitrary write.

## Affected products

- Zephyr Project Zephyr OS versions with CONFIG_IEEE802154_CC1200 enabled

## Timeline

- 2026-10-14: disclosed

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