CVE-2026-1681: Issuing an ICMP ping via the `net ping` shell command to a device's own IPv4 address causes the network stack

Q: How do I fix CVE-2026-1681?

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

Q: Is CVE-2026-1681 being exploited?

CVE-2026-1681 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-2026-1681 affect?

CVE-2026-1681 affects zephyr. Severity is medium (CVSS 6.1). Issuing an ICMP ping via the `net ping` shell command to a device's own IPv4 address causes the network stack to recursively re-enter the input path on the same system work-queue stack. Because the destination is recognized as a local addre

Q: How urgent is CVE-2026-1681?

Priority 27/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2026-1681 is a medium-severity flaw (CVSS 6.1) affecting zephyr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Issuing an ICMP ping via the `net ping` shell command to a device's own IPv4 address causes the network stack to recursively re-enter the input path on the same system work-queue stack. Because the destination is recognized as a local address, both the echo request and the resulting echo reply are processed inline before the current frame returns. The nested input-path frames exceed the work-queue stack and trigger a stack overflow.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-674, CWE-787
Published	2026-05-12
Last modified	2026-10-26

Publisher (CNA): Zephyr Project · Vendor: zephyrproject

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 07:16 UTCPublished CVE record published
2026-10-26 18:10 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-2026-1681?

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

Is CVE-2026-1681 being exploited?

CVE-2026-1681 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-2026-1681 affect?

CVE-2026-1681 affects zephyr. Severity is medium (CVSS 6.1). Issuing an ICMP ping via the `net ping` shell command to a device's own IPv4 address causes the network stack to recursively re-enter the input path on the same system work-queue stack. Because the destination is recognized as a local addre

How urgent is CVE-2026-1681?

Priority 27/100. Public exploit reference

Related CVEs

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References

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