CVE-2026-80944 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel-based systems, particularly those using the mwifiex driver, should be aware of this vulnerability. They should assess their exposure and prioritize patching affected systems to prevent potential stack corruption issues.

Why it matters

This vulnerability in the Linux kernel's mwifiex driver can lead to stack corruption, potentially causing kernel panics. Defenders should prioritize patching affected systems and monitoring for exploitation attempts.

• Potential for stack corruption leading to kernel panics
• Possible exploitation attempts through interrupted or timed-out synchronous commands
• Need for patching to prevent late firmware responses from writing to stale stack addresses
• Importance of monitoring for unusual activity or crashes

Technical summary

The Linux kernel's mwifiex driver has a vulnerability that can lead to stack corruption. When synchronous commands are interrupted or timed out, the caller-provided data buffer remains attached to the command node. This allows a late firmware response to write to a stale stack address, potentially causing a kernel panic due to stack corruption. The issue was observed during repeated association and disassociation cycles, resulting in a kernel panic due to stack corruption. Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly in systems using the mwifiex driver.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly in systems using the mwifiex driver. They should also monitor for any unusual activity or crashes that could indicate exploitation attempts.

Recommended defensive actions

• Verify and apply patches for Linux kernel versions affected by this vulnerability
• Monitor for unusual activity or crashes that could indicate exploitation attempts
• Review system logs for any errors related to the mwifiex driver
• 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
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability was fixed through a patch that detaches the caller-owned data buffer from the still-current command when the wait is interrupted or timed out. This change prevents late responses from writing to stale stack addresses.

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.