CVE-2026-89492 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems should review and apply the patches provided to fix the vulnerability. Linux distribution maintainers should ensure that all Linux kernel versions are up-to-date with the latest security patches. Users of Linux-based systems should consider implementing additional security measures, such as monitoring and intrusion detection, to detect and prevent and

Why it matters

This vulnerability can be triggered by a crafted on-disk image, potentially leading to a denial of service or information disclosure when the image is mounted. Linux kernel developers and maintainers should review and apply the patches provided to fix the vulnerability. Linux distribution maintainers should ensure that all Linux kernel versions are up-to-date with the latest security patches. Users of Linux-based systems should consider implementing additional security measures, such as monitoring and intrusion detection, to detect and prevent potential attacks.

• Denial of service due to out-of-bounds read
• Information disclosure due to potential data exposure

Technical summary

The ocfs2_validate_dx_leaf() and ocfs2_validate_dx_root() functions do not properly validate the ocfs2_dx_entry_list counts against the capacity of the block that holds them. This can lead to an out-of-bounds read when handling directory-index entries. The vulnerability affects Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems. The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and severity. Linux kernel developers and maintainers should review and apply the patches provided to fix the vulnerability.

Defensive priority

High

Recommended defensive actions

• Review and apply the patches provided by the Linux kernel maintainers to fix the vulnerability.
• Ensure that all Linux kernel versions are up-to-date with the latest security patches.
• Consider implementing additional security measures, such as monitoring and intrusion detection, to detect and prevent potential attacks.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The vulnerability was found by 0sec automated security-research tooling. The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and severity. Linux kernel developers and maintainers should review and apply the patches provided to fix the vulnerability. Linux distribution maintainers should ensure that all Linux kernel versions are up-to-date with the latest security patches. Users of Linux-based systems should consider implementing additional security measures, such as monitoring and intrusion, to

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.