CVE-2026-92489 Linux CVE debrief

Who should care

Linux kernel maintainers, network administrators, and security teams responsible for Linux systems should assess exposure and verify patch application to mitigate potential risks. These teams should review Linux kernel configurations and versions for potential exposure, assess network filtering and packet handling for potential impact, and verify patch application and system updates. Additionally, they should conduct vulnerability scanning to identify and

Why it matters

CVE-2026-92489 is a critical Linux kernel vulnerability that could impact network packet handling. Linux kernel maintainers, network administrators, and security teams should assess exposure and verify patch application.

• Potential network packet handling disruption
• Verification of patch application required
• Possible impact on network filtering configurations

Technical summary

The Linux kernel vulnerability (CVE-2026-92489) relates to a double-free of skb in xfrm_dev_direct_output(). The vulnerability was resolved by changing the handling of local_out() return values. This change ensures that the skb is not freed twice, preventing a potential crash or security issue. Affected product deployments should be reviewed for exposure, and patch application should be verified to mitigate potential risks. The vulnerability has a high CVSS score of 9.8, indicating a critical severity level. Linux kernel maintainers, network administrators, and security teams should assess exposure and verify patch application to mitigate potential risks.

Defensive priority

High

Recommended defensive actions

• Review Linux kernel configurations and versions for potential exposure
• Assess network filtering and packet handling for potential impact
• Verify patch application and system updates
• Conduct vulnerability scanning to identify potentially affected systems
• Implement compensating controls for exposed systems
• Monitor network traffic for suspicious activity
• Track exceptions and retest remediated assets

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, the scope of affected systems and versions is not explicitly stated. Further verification is required to determine the extent of potential exposure. Defensive measures should include reviewing Linux kernel configurations and versions for potential exposure, assessing network filtering and packet handling for potential impact, and verifying patch application and system updates.

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.