CVE-2026-5072: A bitwise shift vulnerability in Zephyr's PTP subsystem allows a remote attacker to cause undefined behavior a

Q: How do I fix CVE-2026-5072?

zephyr: upgrade to newer than 4.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-5072 being exploited?

CVE-2026-5072 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-5072 affect?

CVE-2026-5072 affects zephyr. Severity is medium (CVSS 6.5). 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_in

Q: How urgent is CVE-2026-5072?

Priority 33/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2026-5072 is a medium-severity flaw (CVSS 6.5) affecting zephyr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-1335
Published	2026-05-22
Last modified	2026-10-15

Publisher (CNA): Zephyr Project · Vendor: zephyrproject

Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-22 08:16 UTCPublished CVE record published
2026-10-15 23:17 UTCUpdated Record last modified

zephyrproject zephyr UPGRADE

Affected: <= 4.3.0

Fixed in: newer than 4.3.0

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-5072?

zephyr: upgrade to newer than 4.3.0. Exact commands for each OS are on this page.

Is CVE-2026-5072 being exploited?

CVE-2026-5072 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-5072 affect?

CVE-2026-5072 affects zephyr. Severity is medium (CVSS 6.5). 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_in

How urgent is CVE-2026-5072?

Priority 33/100. Public exploit reference

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References

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