CVE-2026-74437 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, users of Linux-based systems with UVC cameras, system administrators, security teams, and vulnerability management teams responsible for Linux-based systems, and operators of systems using the Linux kernel's media uvcvideo component.

Technical summary

The Linux kernel's media uvcvideo component has a deadlock vulnerability. When a UVC camera has an asynchronous control, uvc_status_stop may be called from async_ctrl.work, causing a deadlock. The issue was resolved by returning early from uvc_status_stop if it is currently in the work function. This fix prevents potential deadlocks and ensures system stability. The vulnerability affects the Linux kernel's media uvcvideo component, specifically when a UVC camera has an asynchronous control. The deadlock vulnerability can be triggered when uvc_status_stop is called from async_ctrl.work. To address this vulnerability, Linux kernel developers and maintainers should review and apply the Linux kernel patch to fix the deadlock vulnerability. They should also monitor systems using the Linux kernel for potential issues and consider implementing compensating controls to mitigate potential attacks. Furthermore, they should review the Linux kernel source code to understand the vulnerability and potential impact, perform testing and analysis to determine the scope of affected systems, and develop and implement additional mitigations or workarounds for exposed systems.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the Linux kernel patch to fix the deadlock vulnerability
• Monitor systems using the Linux kernel for potential issues
• Consider implementing compensating controls to mitigate potential attacks
• Review the Linux kernel source code to understand the vulnerability and potential impact
• Perform testing and analysis to determine the scope of affected systems
• Develop and implement additional mitigations or workarounds for exposed systems
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further analysis of the Linux kernel source code and testing may be necessary to fully understand the issue. The vulnerability affects the Linux kernel's media uvcvideo component, specifically when a UVC camera has an asynchronous control. The deadlock vulnerability can be triggered when uvc_status_stop is called from async_ctrl.work. The issue was resolved by returning early from uvc_status_stop if it is currently in the work function. However, the exact scope of affected systems and potential impact on various Linux distributions and deployments is not clear from the available information. Additional research and verification are required to determine the full extent of the vulnerability and to develop effective mitigations.

Official resources