CVE-2026-74747 Linux CVE debrief

Who should care

Linux system administrators, security teams, and developers responsible for maintaining and securing Linux-based systems should assess their exposure and apply patches or mitigations as necessary.

Why it matters

This vulnerability in the Linux kernel's IPVS implementation could allow a local attacker to cause an out-of-bounds access, potentially leading to a denial-of-service or privilege escalation. Linux system administrators and security teams should assess their exposure and apply patches or mitigations as necessary.

• Verify patch deployment and system configurations to prevent potential out-of-bounds access
• Monitor system logs for suspicious activity indicative of exploitation attempts
• Restrict access to vulnerable systems and implement compensating controls

Technical summary

The Linux kernel's IPVS implementation is vulnerable to an out-of-bounds access issue due to the failure to revalidate the Internet Header Length (ihl) field of embedded IP headers. This vulnerability could potentially allow a local attacker to cause a denial-of-service or privilege escalation. The issue arises from the failure to revalidate the embedded headers after reading them from the socket buffer fragments. This can lead to a potential denial-of-service or privilege escalation if exploited. Linux system administrators and security teams should assess their exposure and apply patches or mitigations as necessary.

Defensive priority

Medium

Recommended defensive actions

• Review and apply patches from Linux vendors for the affected IPVS implementation
• Restrict access to vulnerable systems and monitor for suspicious activity
• Verify system configurations and inventory checks for exposure
• Monitor system logs for suspicious activity indicative of exploitation attempts
• Verify patch deployment and system configurations to prevent potential out-of-bounds access
• Restrict access to vulnerable systems and implement compensating controls
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description and affected versions. However, the corpus does not establish specific exploitation instances or impact. The official CVE Program record and NVD vulnerability detail page offer additional context.

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.