CVE-2026-90403 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution vendors, and users of Linux-based systems should assess their exposure and verify the vulnerability status of their kernel versions. This involves reviewing system configurations, kernel versions, and applying patches provided by Linux kernel maintainers to prevent potential issues. Additionally, users should prioritize patching and review compensating controls for exposed systems while remediation is scheduled.

Why it matters

A vulnerability in the Linux kernel's rtlwifi driver has been addressed. Linux kernel maintainers, Linux distribution vendors, and users of Linux-based systems should assess their exposure and verify the vulnerability status of their kernel versions.

• Verify the vulnerability status of Linux kernel versions to prioritize patching.
• Apply patches provided by Linux kernel maintainers to prevent potential issues.
• Review system configurations and kernel versions to ensure they are up-to-date.

Technical summary

The vulnerability in the Linux kernel's rtlwifi driver was caused by an incorrect error path in the rtl_pci_probe() function. This led to skipped cleanup functions and unreverted successful calls to rtl_init_rfkill(), ieee80211_register_hw(), and rtl_debug_add_one(). The issue has been fixed by updating the labels and adding relevant cleanup functions. The fix involves modifying the rtl_pci_probe function to correctly handle error paths and ensure proper cleanup and reversal of successful calls. This change is crucial for maintaining the stability and security of Linux kernel versions.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patches provided by the Linux kernel maintainers.
• Verify the vulnerability status of your Linux kernel versions.
• Update the Linux kernel to the latest version if necessary.
• 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 record and NVD vulnerability detail page provide information on the vulnerability. However, the scope of affected systems and versions is not explicitly stated, requiring verification from the supplied official sources.

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.