Remote memory corruption via oversized WireGuard payload
Published Jul 12, 2026 · Updated Jul 12, 2026
Out-of-bounds write in Zephyr RTOS 4.4.0 WireGuard receive path allows remote attackers to corrupt kernel memory via oversized data. wg_process_data_message() passes the attacker-derived payload length as both the destination capacity and copy length when linearizing into a CONFIG_WIREGUARD_BUF_LEN pool buffer. Remote attackers need a valid receiver index obtained as a configured peer or by observing an active session; the copy reliably crashes the device, while further corruption depends on target memory layout.
Summary
What happened
Out-of-bounds write in Zephyr RTOS 4.4.0 WireGuard receive path allows remote attackers to corrupt kernel memory via oversized data. wg_process_data_message() passes the attacker-derived payload length as both the destination capacity and copy length when linearizing into a CONFIG_WIREGUARD_BUF_LEN pool buffer. Remote attackers need a valid receiver index obtained as a configured peer or by observing an active session; the copy reliably crashes the device, while further corruption depends on target memory layout.
The record
- CVE
- CVE-2026-10665
- Published
- Jul 12, 2026
- Updated
- Jul 12, 2026
- Vendor
- Zephyr Project
- Product
- Zephyr RTOS
- Classifications
- CWE-787, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 12, 2026CVE publishedPublication date reported by the CVE source.
- Jul 12, 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=4.4.0 <4.5.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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.
Weakness, pattern, technique
Public exploit references
- Unchecked WireGuard RX transport payload length causes out-of-bounds writeproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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