zephyrproject-rtos Zephyr up to 4.3 PTP_MSG_MANAGEMENT Message infinite loop

Summaryinfo

A vulnerability was found in zephyrproject-rtos Zephyr up to 4.3. It has been classified as problematic. Affected by this vulnerability is an unknown functionality of the component PTP_MSG_MANAGEMENT Message Handler. This manipulation causes infinite loop. This vulnerability is tracked as CVE-2026-5072. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in zephyrproject-rtos Zephyr up to 4.3. Affected by this vulnerability is an unknown code block of the component PTP_MSG_MANAGEMENT Message Handler. The manipulation with an unknown input leads to a infinite loop vulnerability. The CWE definition for the vulnerability is CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. As an impact it is known to affect availability. The summary by CVE is:

A bitwise shift vulnerability in Zephyr's PTP subsystem allows a remote attacker to cause undefined behavior and potential system crashes. An attacker sends a crafted PTP_MSG_MANAGEMENT message to set an unvalidated negative log_announce_interval value in the port's data set. When a subsequent PTP_MSG_ANNOUNCE message is processed, port_timer_set_timeout_random computes a timeout as NSEC_PER_SEC >> -log_seconds; if the attacker-supplied value is sufficiently negative (e.g., -127), the shift amount exceeds the 64-bit integer width, triggering undefined behavior in C. This can cause a system crash via a compiler-generated illegal instruction trap on some architectures, or produce an erroneous zero timeout leading to resource starvation loops or other logical errors.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-5072 since 03/28/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-31413). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Project Management Software

Vendor

• zephyrproject-rtos

Name

• Zephyr

Version

• 4.0
• 4.1
• 4.2
• 4.3

License

• open-source

Website

• Product: https://github.com/zephyrproject-rtos/zephyr/

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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