CVE-2026-90082 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, system administrators responsible for Linux kernel updates and security patches, and security teams should be aware of this vulnerability. They should review and apply patches, verify MSI-X table size configurations, and monitor system logs for potential denial-of-service attempts. Affected operators and platforms should prioritize patching and mitigation efforts to prevent potential denial-of-service attacks and

Why it matters

CVE-2026-90082 is a Linux kernel vulnerability that requires attention from developers and system administrators to prevent potential denial-of-service attacks and system instability. The vulnerability arises from the failure to cap MSI-X vectors to the device MSI-X table size in the net: mana module. Affected systems should apply the provided patches and verify MSI-X table size configurations to mitigate the risk.

• Denial of service due to out-of-bounds memory access
• Potential system crashes or instability
• Increased risk of local privilege escalation attempts

Technical summary

The Linux kernel vulnerability CVE-2026-90082 occurs in the net: mana module, where the MSI-X vectors are not properly capped to the device MSI-X table size. This can lead to an out-of-bounds memory access, potentially causing a denial of service or system instability. The issue arises from the failure to cap MSI-X vectors, and affected systems should apply patches and verify MSI-X table size configurations to mitigate the risk. The vulnerability requires attention from developers and system administrators to prevent potential denial-of-service attacks and system instability.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided patches to the Linux kernel
• Verify the MSI-X table size configuration for the affected systems
• Monitor system logs for potential denial-of-service 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 record and Linux kernel source code indicate a vulnerability in the net: mana module. The issue arises from the failure to cap MSI-X vectors to the device MSI-X table size, potentially leading to out-of-bounds memory access.

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.