CVE-2026-1679 zephyrproject-rtos CVE debrief

Who should care

Defenders responsible for Zephyr-based systems, particularly those with local code execution risks, should assess exposure and prioritize patching or mitigations. This includes operators of systems using Zephyr, security teams managing local code execution risks, and vulnerability management teams tracking affected versions. Defenders need to verify affected versions and apply patches or mitigations to prevent local attackers from potentially exploiting

Why it matters

CVE-2026-1679 allows local code to overflow a buffer in the eswifi socket offload driver of Zephyr, potentially corrupting kernel memory. Defenders should prioritize verifying affected versions and applying patches or mitigations.

• Local attackers could potentially exploit this vulnerability to corrupt kernel memory.
• Defenders need to verify affected versions and apply patches or mitigations.
• Local code execution risks are increased due to the vulnerability's nature.

Technical summary

The eswifi socket offload driver in Zephyr copies user-provided payloads into a fixed buffer without checking available space, allowing local code to overflow the buffer and corrupt kernel memory. This vulnerability requires local code that can call the socket send API and has a CVSS score of 7.3. The vulnerability's impact is limited to local attackers, as remote exploitation is not possible. Defenders should prioritize verifying affected versions and applying patches or mitigations. The driver does not perform bounds checking on the payload length, which can lead to memory corruption.

Defensive priority

Defenders should prioritize verifying affected versions and applying patches or mitigations.

Recommended defensive actions

• Verify if Zephyr versions less than 4.4.0 are in use and apply patches or mitigations.
• Review local code that interacts with the eswifi socket offload driver.
• Monitor for potential local attacks that could exploit this vulnerability.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Evidence notes

The CVE record and source item provide details on the vulnerability, but additional information on exploitation and impact is limited. The eswifi socket offload driver in Zephyr copies user-provided payloads into a fixed buffer without checking available space, allowing local code to overflow the buffer and corrupt kernel memory. There are no known public exploits, but defenders should verify affected versions and apply patches or mitigations. The CVE Program record and NVD detail page provide official metadata and vulnerability

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.