CVE-2026-74279 Linux CVE debrief

Who should care

Linux kernel maintainers, developers, and users of affected versions should assess exposure and prioritize patching to prevent potential data corruption or system instability. Operators of affected systems should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Security teams should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed and review

Why it matters

Defenders should prioritize patching affected Linux kernel versions, verifying DMA buffer handling, and monitoring for potential data corruption or system instability due to the DMA buffer leak and repeated unmapping vulnerability in the crypto: cavium/cpt component.

• Data corruption or loss due to DMA buffer leaks
• System instability or crashes caused by repeated unmapping
• Potential denial-of-service (DoS) conditions
• Increased risk of security breaches or exploits

Technical summary

The Linux kernel's crypto: cavium/cpt component is vulnerable to a DMA buffer leak and repeated unmapping issue. The sg_cleanup error path incorrectly uses list[i] instead of list[j], leading to successfully mapped entries being leaked and the failed one being repeatedly unmapped. This issue can cause data corruption or loss due to DMA buffer leaks, system instability or crashes caused by repeated unmapping, potential denial-of-service (DoS) conditions, and increased risk of security breaches or exploits. Affected Linux kernel versions should be patched with the provided fixes, and DMA buffer handling and unmapping in the crypto: cavium/cpt component should be verified.

Defensive priority

Defenders should prioritize patching affected Linux kernel versions, verifying DMA buffer handling, and monitoring for potential data corruption or system instability.

Recommended defensive actions

• Patch affected Linux kernel versions with the provided fixes
• Verify DMA buffer handling and unmapping in the crypto: cavium/cpt component
• Monitor system logs for potential data corruption or instability
• 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE Program record and NVD vulnerability detail provide official information on the vulnerability. Supplemental source references from the Linux kernel Git repository offer technical details on the affected code and potential fixes.

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.