CVE-2026-5072
CVE-2026-5072 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1335.
Key facts
- Severity: Medium (CVSS 3.x base score 6.5)
- EPSS exploit prediction: 0% (8th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-31413
- Weakness: CWE-1335
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2026-5072?
- CVE-2026-5072 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-5072 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-5072?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-5072 have an EU (EUVD) identifier?
- Yes. CVE-2026-5072 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31413.
- When was CVE-2026-5072 published?
- CVE-2026-5072 was published on 2026-05-22 and last updated on 2026-06-17.
References
Other CWE-1335 vulnerabilities
- CVE-2016-9842 — High (CVSS 8.8): The inflateMark function in inflate.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact…
- CVE-2023-52810 — High (CVSS 8.4): In the Linux kernel, the following vulnerability has been resolved: fs/jfs: Add check for negative…
- CVE-2026-4426 — Medium (CVSS 6.5): A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by…