CVE-2026-74373 Linux kernel CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems that utilize md/raid1 and md/raid10 modules. Defenders should verify Linux kernel versions and apply necessary updates to prevent potential accounting issues. Linux kernel developers and maintainers should review and apply patches to ensure accurate bio accounting and prevent potential accounting issues.

Why it matters

A bio accounting issue in the Linux kernel's md/raid1 and md/raid10 modules has been addressed. Defenders should verify Linux kernel versions and apply necessary updates to prevent potential accounting issues.

• Defenders should verify Linux kernel versions and apply necessary updates to prevent potential accounting issues.
• Linux kernel developers and maintainers should review and apply patches to ensure accurate bio accounting.

Technical summary

The Linux kernel's md/raid1 and md/raid10 modules had a bio accounting issue. The issue arose from incorrect accounting of cloned bios when a failed bio was split and resubmitted. This could lead to double accounting or missing accounting for certain bios. The issue has been resolved by using md_cloned_bio() to control bio accounting. The fix ensures accurate bio accounting and prevents potential issues. Linux kernel developers and maintainers should review and apply patches to ensure accurate bio accounting and prevent potential accounting issues.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patches provided by the Linux kernel maintainers.
• Verify the Linux kernel version and apply the necessary updates.
• Monitor the Linux kernel's official repositories for future updates and security advisories.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• 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 bio accounting issue in the Linux kernel's md/raid1 and md/raid10 modules. The issue has been resolved by using md_cloned_bio() to control bio accounting.

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.