Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zephyrproject | Zephyr | <= 4.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3v98-458v-ExploitPatchVendor Advisory
FAQ
What is CVE-2026-5072?
CVE-2026-5072 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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...
How severe is CVE-2026-5072?
CVE-2026-5072 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-5072?
Check the references section above for vendor advisories and patch information. Affected products include: Zephyrproject Zephyr.