CVE-2026-5072

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.

Score

CVSS 3.1 6.5 Medium

Status

Analyzed - vulnerabilities@zephyrproject.org

Published

2026-05-22

Last modified

2026-10-15

Weaknesses

CWE-1335

Affected products

• Zephyr (Zephyrproject)
• Zephyr (Zephyrproject-rtos)

References

• https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3v98-458v-388r