CVE-2026-10646 zephyrproject CVE debrief

Who should care

Organizations using Zephyr v4.0.0 through v4.4.0 should be aware of this vulnerability and take steps to mitigate it. Operators of affected systems, platform administrators, vulnerability management teams, and security teams should prioritize patching to prevent potential denial of service or memory corruption attacks. They should also review compensating controls for exposed systems while remediation is scheduled and verified. Monitoring for suspicious network activity and performing regular vulnerability scans are recommended. Asset inventory and exposure reviews should be conducted to ensure all affected systems are accounted for and remediated. Rollback/change windows and source tracking should be considered for affected deployments. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented. This vulnerability's impact on operational security and potential exploitation vectors should be assessed and addressed through defensive measures and compensating controls. The CVE record and vendor advisory provide critical context for understanding the vulnerability and implementing effective mitigations. Affected organizations should ensure that their security teams are aware of the vulnerability and its potential impact on their systems and operations. They should also consider the vulnerability's potential impact on their overall security posture and take steps to mitigate it. The vulnerability should be prioritized for remediation based on its severity and potential impact on the organization's operations and security posture. Organizations should also consider implementing additional security measures, such as monitoring and detection, to help identify and respond to potential exploitation attempts. By taking these steps, organizations can help protect their systems and data from the potential risks associated with this vulnerability. The vulnerability's disclosure and CVE record provide critical context for understanding the vulnerability and implementing effective mitigations. Affected organizations should ensure that their security teams are aware of the vulnerability and its potential impact on thei

Technical summary

The CVE-2026-10646 vulnerability in Zephyr's BSD-sockets getaddrinfo() implementation allows for a network-influenceable use-after-return, potentially leading to crashes or memory corruption. This occurs when the resolver's timeout work is delayed, causing the semaphore wait to timeout and the previous query slot to remain active, allowing an attacker to invoke dns_resolve_cb() against the now out-of-scope stack frame.

Defensive priority

Organizations using Zephyr v4.0.0 through v4.4.0 should prioritize patching to prevent potential denial of service or memory corruption attacks.

Recommended defensive actions

• Apply the patch from https://github.com/zephyrproject-rtos/zephyr/commit/cd27da58eedb8d0fe380dd340b81ca5afa35de45
• Review and apply vendor advisory from https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-h752-vhmf-29w6
• Update to Zephyr version 4.4.1 or later
• Monitor for suspicious network activity
• Perform regular vulnerability scans

Evidence notes

The CVE-2026-10646 vulnerability in Zephyr's BSD-sockets getaddrinfo() implementation allows for a network-influenceable use-after-return, potentially leading to crashes or memory corruption. Evidence is based on official CVE and NVD records, as well as vendor advisories. Affected deployments should be identified and verified for exposure. Defenders should review the official advisory and CVE record to validate affected scope, severity, and vendor guidance. The vulnerability's impact on operational security and potential exploitation vectors should be assessed. To verify, defenders should check for suspicious network activity and perform regular vulnerability scans.

Official resources