CVE-2026-30056 free5gc CVE debrief

Who should care

Administrators and users of free5gc v4.0.1 should be aware of this vulnerability and take necessary precautions to mitigate its impact. This includes reviewing system configurations, ensuring that appropriate security measures are in place, and staying informed about any updates or patches released by the vendor. Additionally, security teams and vulnerability management teams should assess the risk and prioritize remediation efforts accordingly. Networks that have not yet upgraded from affected versions of free5gc should prioritize patching or mitigation strategies to prevent potential service disruptions. Monitoring and logging should also be reviewed to detect any suspicious activity related to this vulnerability. Compensating controls, such as rate limiting or IP blocking, may be necessary for exposed systems while remediation is scheduled and verified. Asset inventory and rollback/change windows should be considered in the remediation process. Source tracking and exposure review are also recommended to ensure a comprehensive approach to addressing this vulnerability. The CVE record and NVD entry provide evidence of the vulnerability, but further details about the vulnerability, such as affected configurations and potential mitigations, are limited. Additional investigation and verification are necessary to fully understand the vulnerability's impact. The vulnerability's technical details and potential mitigations should be carefully reviewed to ensure that all necessary steps are taken to prevent exploitation. This may involve coordinating with vendors, reviewing system configurations, and implementing additional security controls. By taking a proactive and informed approach, organizations can reduce the risk associated with this vulnerability and protect their 5G infrastructure from potential attacks. The vulnerability's impact on operational security and potential business disruptions should also be carefully assessed and addressed through a thorough risk management process. This includes identifying potential attack vectors, assessing the likelihood and potential impact of an attack, and implementing measures to mitigate or prevent such attacks. By doing,

Technical summary

The vulnerability is caused by a NULL pointer dereference in the AMF NGAP Dispatcher component of free5gc v4.0.1. An attacker can exploit this vulnerability by supplying crafted NGAP messages during the initialization of a new RAN connection, resulting in a Denial of Service (DoS).

Defensive priority

High-priority defensive actions are required to address the NULL pointer dereference vulnerability in free5gc v4.0.1, which can cause a Denial of Service (DoS).

Recommended defensive actions

• Verify the version of free5gc and apply patches or updates if available.
• Implement network filtering to restrict crafted NGAP messages.
• Monitor for suspicious activity and implement logging and alerting.
• Consider compensating controls, such as rate limiting or IP blocking.

Evidence notes

The CVE record and NVD entry provide evidence of the vulnerability. However, further details about the vulnerability, such as affected configurations and potential mitigations, are limited. Additional investigation and verification are necessary to fully understand the vulnerability's impact.

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.