CVE-2026-93815 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, system administrators responsible for Linux kernel updates, and security teams should review and apply the patch to ensure the au1000 network driver is updated. They should also verify the Linux kernel version and update if necessary, and monitor system logs for potential issues related to the au1000 network driver.

Why it matters

A vulnerability in the Linux kernel's au1000 network driver has been addressed. The issue could cause a sleeping function to be called from an invalid context, potentially leading to system instability. Linux kernel developers and maintainers, as well as system administrators responsible for Linux kernel updates, should review and apply the patch to ensure the driver is updated.

• Verification of Linux kernel version and patch application is necessary to prevent potential system instability
• Monitoring system logs for issues related to the au1000 network driver is recommended

Technical summary

The au1000_close() function in the Linux kernel's au1000 network driver called free_irq() while holding a spinlock. This could cause a sleeping function to be called from an invalid context, potentially leading to system instability. The issue was identified through static analysis and manual review of the au1000_close() .ndo_stop path. A directed runtime validation also reproduced the issue. The vulnerability is specific to the au1000 network driver and does not affect other drivers. Linux kernel developers and maintainers should review and apply the patch to ensure the driver is updated.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch to ensure the au1000 network driver is updated
• Verify the Linux kernel version and update if necessary
• Monitor system logs for potential issues related to the au1000 network 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The issue was found by static analysis and confirmed through manual review of the au1000_close() .ndo_stop path. A directed runtime validation also reproduced the issue. The analysis was based on the Linux kernel source code and the au1000 network driver implementation. The vulnerability is specific to the au1000 network driver and does not affect other drivers.

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.