CVE-2025-39706
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-05

Last updated on: 2025-11-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Destroy KFD debugfs after destroy KFD wq Since KFD proc content was moved to kernel debugfs, we can't destroy KFD debugfs before kfd_process_destroy_wq. Move kfd_process_destroy_wq prior to kfd_debugfs_fini to fix a kernel NULL pointer problem. It happens when /sys/kernel/debug/kfd was already destroyed in kfd_debugfs_fini but kfd_process_destroy_wq calls kfd_debugfs_remove_process. This line debugfs_remove_recursive(entry->proc_dentry); tries to remove /sys/kernel/debug/kfd/proc/<pid> while /sys/kernel/debug/kfd is already gone. It hangs the kernel by kernel NULL pointer. (cherry picked from commit 0333052d90683d88531558dcfdbf2525cc37c233)
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Meta Information
Published
2025-09-05
Last Modified
2025-11-03
Generated
2026-06-16
AI Q&A
2025-09-05
EPSS Evaluated
2026-06-14
NVD
CVE-2025-39706
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel 6.1.153-1
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a kernel NULL pointer dereference issue in the Linux kernel's AMD KFD (Kernel Fusion Driver) debugfs handling. It occurs because the KFD debugfs directory is destroyed before a work queue (kfd_process_destroy_wq) that tries to remove process-specific debugfs entries is executed. When the work queue runs, it attempts to remove entries under a debugfs directory that no longer exists, causing the kernel to hang due to a NULL pointer dereference.

Impact Analysis

This vulnerability can cause the Linux kernel to hang (freeze) due to a NULL pointer dereference when accessing debugfs entries related to AMD KFD. This can lead to system instability or denial of service, affecting the availability of the system.

Mitigation Strategies

To mitigate this vulnerability, update your Linux kernel to a version that includes the fix where kfd_process_destroy_wq is moved prior to kfd_debugfs_fini, preventing the kernel NULL pointer dereference and hang. Avoid manually destroying /sys/kernel/debug/kfd debugfs entries before the kernel properly handles them.

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