CVE-2026-5072
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
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, leading to undefined behavior when processing a subsequent PTP_MSG_ANNOUNCE message. This can result in system crashes or logical errors.
Risk Assessment
The organization is exposed to remote denial-of-service (DoS) attacks or unpredictable behavior, potentially disrupting critical real-time services.
Recommendation
Immediately update Zephyr to a version that includes a fix for validating log_announce_interval values. If an update is not possible, restrict access to PTP ports to trusted sources.
Original NVD description (English source)
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.