CVE-2026-80943 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel security, network administrators, and incident responders should be aware of this vulnerability and prioritize patching vulnerable systems. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Why it matters

The Linux kernel vulnerability in the rtlwifi driver allows for potential out-of-bounds access attacks, which can lead to elevation of privileges, data breaches, or denial of service attacks. Defenders should prioritize patching vulnerable systems to prevent these types of attacks.

• Potential out-of-bounds access attacks
• Elevation of privileges on affected systems
• Data breaches or unauthorized access
• Denial of Service (DoS) attacks

Technical summary

The rtl92du_tx_fill_desc() function in the Linux kernel's rtlwifi driver does not properly check the QoS TID before indexing into the sta_entry->tids[] array, leading to a potential out-of-bounds access. This vulnerability allows for potential out-of-bounds access attacks, which can lead to elevation of privileges, data breaches, or denial of service attacks. The issue was detected by a static analysis tool and confirmed by manual audit. UBSAN validation reports an array-index-out-of-bounds access with index 10 for type 'rtl_tid_data [9]'.

Defensive priority

Defenders should prioritize patching vulnerable Linux kernel versions to prevent potential out-of-bounds access attacks.

Recommended defensive actions

• Patch vulnerable Linux kernel versions
• Verify and apply updates from Linux vendors
• Monitor network traffic for suspicious activity
• 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 vulnerability was detected by a static analysis tool and confirmed by manual audit. UBSAN validation reports an array-index-out-of-bounds access with index 10 for type 'rtl_tid_data [9]'. The issue was identified in the Linux kernel's rtlwifi driver, specifically in the rtl92du_tx_fill_desc() function. The function does not properly check the QoS TID before indexing into the sta_entry->tids[] array, leading to a potential out-of-bounds 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.