CVE-2025-37869 in Linux
Summary
by MITRE • 05/09/2025
In the Linux kernel, the following vulnerability has been resolved:
drm/xe: Use local fence in error path of xe_migrate_clear
The intent of the error path in xe_migrate_clear is to wait on locally generated fence and then return. The code is waiting on m->fence which could be the local fence but this is only stable under the job mutex leading to a possible UAF. Fix code to wait on local fence.
(cherry picked from commit 762b7e95362170b3e13a8704f38d5e47eca4ba74)
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 01/31/2026
The vulnerability CVE-2025-37869 resides within the Linux kernel's graphics subsystem, specifically in the Intel Xe graphics driver implementation under the drm/xe module. This issue manifests as a use-after-free condition that can potentially lead to system instability or privilege escalation. The flaw occurs during the error handling path of the xe_migrate_clear function, which is responsible for managing memory migration operations in the graphics processing unit. The vulnerability represents a critical security concern as it could be exploited to compromise the integrity of the graphics driver and potentially the entire system.
The technical root cause involves improper synchronization mechanisms within the graphics driver's error handling code path. The xe_migrate_clear function contains an error path that should wait on a locally generated fence before returning control to the calling function. However, the implementation incorrectly references m->fence, which may point to either a local fence or a different fence object that is not properly synchronized. This ambiguity becomes particularly problematic when the code executes outside the protection of the job mutex, creating a race condition scenario where the fence object could be freed while still being referenced. The vulnerability specifically stems from the lack of explicit fence object validation and the reliance on potentially unstable fence references during error handling operations.
The operational impact of this vulnerability extends beyond simple system crashes or hangs, as it creates opportunities for malicious actors to exploit the use-after-free condition for privilege escalation or denial-of-service attacks. When the graphics driver processes memory migration operations, particularly in scenarios involving error conditions, the improper fence handling can result in memory corruption that may be leveraged to execute arbitrary code with kernel privileges. This represents a significant risk to systems running Linux distributions with Intel Xe graphics hardware, especially in server environments where graphics processing is intensive or in embedded systems where kernel-level access is critical. The vulnerability's exploitation potential is further amplified by the fact that it occurs during routine graphics operations rather than specialized attack vectors.
Mitigation strategies for CVE-2025-37869 focus on implementing proper synchronization and fence object handling within the graphics driver's error paths. The fix involves explicitly referencing the local fence object rather than relying on potentially unstable fence pointers during error conditions. This approach aligns with established security practices for kernel development and follows the principle of least privilege by ensuring that all memory references are properly validated before access. System administrators should prioritize applying the kernel patches that contain the fix, which specifically addresses the race condition by ensuring that the error path always waits on the correct local fence object. The solution also emphasizes the importance of maintaining proper mutex locking mechanisms during critical sections of graphics driver code, particularly when dealing with shared resources and asynchronous operations. This vulnerability demonstrates the critical importance of robust synchronization in kernel-level graphics drivers and aligns with common ATT&CK techniques related to privilege escalation through kernel vulnerabilities. The fix addresses the underlying CWE-416 use-after-free vulnerability pattern while reinforcing proper memory management practices in graphics driver development.