ptp: Potential Denial of Service via PTP Interval Shift

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.

Scores

EPSS (exploitation in 30 days)

0.30% · top 77% of all CVEs (5 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

• CWE-1335 Incorrect Bitwise Shift of Integer (opens in a new tab)All about CWE-1335 and its CVEs

Affected products

• zephyrproject-rtos · Zephyr

  • affected < 4.3.1

References (1)

• https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3v98-458v-388r (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-5072](https://trackcve.app/badge/CVE-2026-5072.svg)](https://trackcve.app/cve/CVE-2026-5072)

Record last updated 15 Oct 2026, 22:10 UTC.