CVE-2026-90016 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution maintainers, and users of affected Linux kernel versions should assess exposure and prioritize verification and patching. The vulnerability requires verification of affected Linux kernel versions and prioritized patching. Operators of Linux kernel versions, platform administrators, and security teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor

Why it matters

CVE-2026-90016 is a HIGH severity vulnerability in the Linux kernel that requires verification of affected versions and prioritized patching.

• Verify if Linux kernel versions are affected by CVE-2026-90016
• Assess exposure of Linux kernel versions in use
• Apply patches or updates from the Linux kernel maintainers

Technical summary

The Linux kernel's rtl8723bs module has a 1-byte out-of-bounds read vulnerability due to a missing bounds check in the rtw_restruct_wmm_ie function. The function scans for a WMM IE in the in_ie buffer and fails to check for the bounds of the buffer, leading to a potential out-of-bounds read. This issue can be triggered when the function fails to find the WMM IE near the end of the buffer. The vulnerability requires verification of affected Linux kernel versions and prioritized patching. Defenders should assess exposure and prioritize verification of affected Linux kernel versions.

Defensive priority

Assess exposure and prioritize verification of affected Linux kernel versions.

Recommended defensive actions

• Assess exposure of Linux kernel versions in use
• Verify if Linux kernel versions are affected by CVE-2026-90016
• Apply patches or updates from the Linux kernel maintainers
• 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 entry provide details on the vulnerability, which is a 1-byte out-of-bounds read in the Linux kernel's rtl8723bs module. The vulnerability is caused by a missing bounds check in the rtw_restruct_wmm_ie function. The function scans for a WMM IE in the in_ie buffer and fails to check for the bounds of the buffer, leading to a potential out-of-bounds read. Defenders should verify if Linux kernel versions are affected by CVE-2026-90016 and assess exposure of Linux kernel versions in use.

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.