CVE-2026-80944 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel-based systems, particularly those using the mwifiex driver, should assess exposure and prioritize patching. This includes administrators and security teams managing Linux-based infrastructure, as well as developers working with the Linux kernel or mwifiex driver.

Why it matters

CVE-2026-80944 is a vulnerability in the Linux kernel's mwifiex driver that can lead to stack corruption and system instability. Defenders should prioritize verifying and applying patches, reviewing system configurations, and monitoring logs for potential exploitation attempts.

• Potential for stack corruption leading to system crashes or instability
• Possible exposure to firmware responses writing to stale stack addresses
• Need for verification and patching of affected Linux kernel versions
• Importance of monitoring system logs for indicators of exploitation attempts

Technical summary

The Linux kernel's mwifiex driver has a vulnerability that can lead to stack corruption when a synchronous command's wait is interrupted. This occurs because the driver keeps the caller-provided data buffer in cmd_node->data_buf, and several callers pass stack-allocated objects there. If wait_event_interruptible_timeout() is interrupted, the caller can return and release that stack object while the firmware command is still the current command. A late firmware response then reaches the normal response handler, which can copy data through cmd_node->data_buf into the stale stack address.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by CVE-2026-80944, particularly for systems using the mwifiex driver.

Recommended defensive actions

• Verify and apply patches for Linux kernel versions affected by CVE-2026-80944
• Review system configurations and inventory to identify potential exposure
• Monitor system logs for indicators of exploitation attempts
• Perform thorough vulnerability assessments
• Implement compensating controls for exposed systems
• Track and manage exceptions
• Conduct regular security audits

Evidence notes

The CVE record and associated sources describe a vulnerability in the Linux kernel's mwifiex driver, which has been resolved through a patch. The vulnerability is related to the handling of synchronous commands and the potential for stack corruption when a wait is interrupted.

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.