CVE-2026-6862 Red Hat CVE debrief

Who should care

Red Hat Enterprise Linux 10 system administrators and security teams should assess exposure and apply patches or mitigations as available. This vulnerability can lead to denial of service (DoS) via infinite recursion and stack exhaustion, potentially causing system crashes and process termination. Security teams must prioritize patching or mitigation to prevent local user exploitation.

Why it matters

CVE-2026-6862 allows a local user to cause a denial of service (DoS) in Red Hat Enterprise Linux 10 systems using a specially crafted device path node, requiring system administrators and security teams to assess exposure and apply patches or mitigations.

• Denial of service (DoS) via infinite recursion and stack exhaustion
• Potential system crashes and process termination
• Need for patching or mitigation to prevent local user exploitation

Technical summary

The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, allowing a local user to provide a specially crafted device path node, leading to infinite recursion, stack exhaustion, and a process crash, resulting in a denial of service (DoS). Affected systems include Red Hat Enterprise Linux 10. Defensive measures include assessing exposure and applying patches or mitigations as available. Technical details are based on CVE and NVD information; further analysis is advised.

Defensive priority

Assess exposure and apply patches or mitigations as available.

Recommended defensive actions

• Assess exposure in Red Hat Enterprise Linux 10 systems
• Apply patches or mitigations as available
• Monitor for local user exploitation attempts
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets
• Confirm whether affected product deployments exist in managed environments

Evidence notes

The device path node parser in libefiboot fails to validate node lengths, allowing a local user to cause a DoS. This issue is exacerbated by the lack of validation for each node's Length field, which should be at least 4 bytes. Evidence is limited to public CVE details and NVD vulnerability assessments. Further verification is recommended.

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.