CVE-2026-74518 Linux CVE debrief

Who should care

Linux kernel maintainers, users, and administrators should be aware of this vulnerability and take steps to assess exposure and apply patches. Affected operators and platforms may experience stability issues or potential crashes due to list corruption in the allocate_file_region_entries() function. Vulnerability management and security teams should prioritize patch development and testing, and review compensating controls for exposed systems.

Why it matters

This vulnerability can impact Linux kernel stability and potentially lead to system crashes or unexpected behavior. Linux kernel maintainers, users, and administrators should assess exposure and apply patches to prevent list corruption.

• List corruption can lead to unexpected behavior and potential crashes
• System administrators may need to verify fix application and test affected systems
• Linux kernel maintainers should prioritize patch development and testing

Technical summary

The allocate_file_region_entries() function in the Linux kernel's mm/hugetlb subsystem is vulnerable to list corruption. This occurs when the function allocates file_region descriptors using GFP_KERNEL, drops the resv->lock, and then splices the new entries into resv->region_cache. A concurrent region_chg()/region_add()/region_del() operation can consume cache entries during the unlocked window, forcing a second iteration that corrupts the list.

Defensive priority

Linux kernel maintainers and users should prioritize assessing exposure and applying patches to prevent potential list corruption and associated impacts.

Recommended defensive actions

• Assess exposure by reviewing Linux kernel versions and configurations
• Apply patches from Linux kernel maintainers
• Monitor system logs for signs of list corruption
• Verify fix application and test affected systems
• 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 Program record and NVD vulnerability detail provide official information about the vulnerability. Linux kernel source references are available for further analysis. To verify fix application and assess exposure, defenders should review Linux kernel versions and configurations, monitor system logs for signs of list corruption, and apply patches from Linux kernel maintainers. Evidence limits are based on available details from the CVE Program and NVD, which may not cover all potential impacts or affected systems.

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.