Out-of-bounds read via received-frame length underflow
Published Oct 14, 2026 · Updated Oct 14, 2026
Zephyr RTOS STM32WBA radio-driver underflow allows physically proximate attackers to cause an out-of-bounds read via received frames. The stm32wba_802154_rx_thread() function subtracts the FCS length without validating the reported length, then passes the wrapped byte count to net_pkt_write(), copying adjacent RAM into a network packet. Reaching the flaw requires the vendor link layer to accept a frame shorter than its FCS without error; assertions are disabled by default, and external retrieval of the copied memory is not established.
Summary
What happened
Zephyr RTOS STM32WBA radio-driver underflow allows physically proximate attackers to cause an out-of-bounds read via received frames. The stm32wba_802154_rx_thread() function subtracts the FCS length without validating the reported length, then passes the wrapped byte count to net_pkt_write(), copying adjacent RAM into a network packet. Reaching the flaw requires the vendor link layer to accept a frame shorter than its FCS without error; assertions are disabled by default, and external retrieval of the copied memory is not established.
The record
- CVE
- CVE-2026-75085
- Published
- Oct 14, 2026
- Updated
- Oct 14, 2026
- Vendor
- Zephyr Project
- Product
- Zephyr RTOS
- Classifications
- Unavailable
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 14, 2026CVE publishedPublication date reported by the CVE source.
- Oct 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.3.0 <=4.4.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
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Technologies
Your stack
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Your stack
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