CVE-2026-1679: The eswifi socket offload driver copies user-provided payloads into a fixed buffer without checking available

Q: How do I fix CVE-2026-1679?

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

Q: Is CVE-2026-1679 being exploited?

CVE-2026-1679 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-2026-1679 affect?

CVE-2026-1679 affects zephyr. Severity is high (CVSS 7.3). The eswifi socket offload driver copies user-provided payloads into a fixed buffer without checking available space; oversized sends overflow `eswifi->buf`, corrupting kernel memory (CWE-120). Exploit requires local code that can call the s

Routine

HIGH 7.3UPGRADE

CVE-2026-1679 is a high-severity flaw (CVSS 7.3) affecting zephyr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The eswifi socket offload driver copies user-provided payloads into a fixed buffer without checking available space; oversized sends overflow `eswifi->buf`, corrupting kernel memory (CWE-120). Exploit requires local code that can call the socket send API; no remote attacker can reach it directly.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-120
Published	2026-03-28
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

2026-03-28 00:16 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-2026-1679?

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

Is CVE-2026-1679 being exploited?

CVE-2026-1679 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-2026-1679 affect?

CVE-2026-1679 affects zephyr. Severity is high (CVSS 7.3). The eswifi socket offload driver copies user-provided payloads into a fixed buffer without checking available space; oversized sends overflow `eswifi->buf`, corrupting kernel memory (CWE-120). Exploit requires local code that can call the s

How urgent is CVE-2026-1679?

Priority 34/100. High severity; Public exploit reference

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References

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