CVE-2026-74312 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, as well as users and administrators of systems running the affected kernel versions, should assess exposure and apply patches as necessary.

Why it matters

The Linux kernel's vhost/vdpa subsystem has a vulnerability that allows for out-of-bounds access, potentially leading to crash/DoS. Linux kernel developers and maintainers, as well as users and administrators of systems running the affected kernel versions, should assess exposure and apply patches as necessary.

• Potential crash or DoS due to out-of-bounds access
• Invalid PFN remaps may occur due to lack of validation

Technical summary

The Linux kernel's vhost/vdpa subsystem is vulnerable to out-of-bounds access in the callback path due to a lack of validation of the virtqueue index in the mmap and fault paths. This issue can potentially lead to invalid PFN remaps and crash/DoS. The vulnerability has been resolved through a series of commits that extract a unified vhost_vdpa_get_vq_notification() helper, which validates the queue index against v->nvqs and applies array_index_nospec() before calling the driver callback. Both the mmap and fault paths use this helper, consolidating bounds checking into a single location.

Defensive priority

High

Recommended defensive actions

• Review and apply the provided patches to the Linux kernel
• Verify the versions of the Linux kernel in use and assess exposure
• Monitor for potential exploitation attempts
• 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 Program record and NVD vulnerability detail provide information on the vulnerability. The Linux kernel's vhost/vdpa subsystem is affected, and the issue has been resolved through a series of commits.

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.