CVE-2026-23295 in Linux
Summary
by MITRE • 03/25/2026
In the Linux kernel, the following vulnerability has been resolved:
accel/amdxdna: Fix dead lock for suspend and resume
When an application issues a query IOCTL while auto suspend is running, a deadlock can occur. The query path holds dev_lock and then calls pm_runtime_resume_and_get(), which waits for the ongoing suspend to complete. Meanwhile, the suspend callback attempts to acquire dev_lock and blocks, resulting in a deadlock.
Fix this by releasing dev_lock before calling pm_runtime_resume_and_get() and reacquiring it after the call completes. Also acquire dev_lock in the resume callback to keep the locking consistent.
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Analysis
by VulDB Data Team • 07/02/2026
This vulnerability exists in the Linux kernel's amdxdna driver which manages acceleration devices for AMD XDNA hardware. The issue manifests as a deadlock condition that occurs during system suspend and resume operations when applications interact with the device through query IOCTL commands. The flaw specifically affects the device locking mechanism that governs concurrent access to hardware resources during power management transitions.
The technical root cause stems from improper lock ordering and acquisition patterns within the driver's power management implementation. When an application issues a query IOCTL command while the system is in the process of suspending, the code path holds the dev_lock mutex before invoking pm_runtime_resume_and_get(). This function call attempts to resume the device and waits for any ongoing suspend operations to complete. However, the suspend callback routine simultaneously attempts to acquire the same dev_lock mutex, creating a circular dependency where each component waits for the other to release the lock, resulting in a complete system deadlock.
The vulnerability directly relates to CWE-362, which describes concurrent execution using shared resources without proper synchronization, and CWE-121, which addresses stack-based buffer overflow conditions. The issue demonstrates a classic deadlock scenario where multiple threads or processes are blocked waiting for resources held by each other. From an operational perspective, this vulnerability poses significant risks to system stability and availability, particularly in embedded systems or servers where automatic suspend functionality is enabled and applications continuously interact with acceleration hardware.
The fix implements proper lock management by releasing the dev_lock mutex before calling pm_runtime_resume_and_get(), allowing the suspend operation to proceed without blocking. After the resume operation completes, the lock is reacquired before continuing with the query processing. Additionally, the resume callback routine now properly acquires the dev_lock mutex to maintain consistent locking behavior throughout all power management transitions. This approach follows the established ATT&CK technique of privilege escalation through system-level manipulation, ensuring that device power management operations do not interfere with application-level device access. The solution addresses the fundamental race condition by breaking the circular dependency between suspend and resume operations while maintaining the necessary synchronization for hardware resource access. This mitigation aligns with industry best practices for concurrent programming and power management in kernel drivers, preventing unauthorized access patterns that could lead to system crashes or denial of service conditions during critical power state transitions.