CVE-2026-63882 in Linux
Summary
by MITRE • 07/19/2026
In the Linux kernel, the following vulnerability has been resolved:
drm/amdkfd: fix NULL pointer bug in svm_range_set_attr
The process_info could be NULL if user doesn't call kfd_ioctl_acquire_vm before calling kfd_ioctl_svm.
(cherry picked from commit 83a26c812e0529eb040d31a76f73e33e637243d4)
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Analysis
by VulDB Data Team • 07/19/2026
The vulnerability resides within the Linux kernel's graphics subsystem, specifically in the amdkfd driver component responsible for managing AMD GPU memory operations. This issue manifests as a null pointer dereference that occurs during the execution of svm_range_set_attr function, which is part of the kernel's memory management framework for GPU virtual memory allocation. The flaw represents a classic software error pattern where program logic fails to properly validate input parameters before attempting to access referenced memory locations.
The technical root cause stems from improper handling of user-space API calls within the AMD Kernel Driver Framework. When userspace applications invoke the kfd_ioctl_svm ioctl command without first calling kfd_ioctl_acquire_vm, the process_info structure remains uninitialized or set to NULL. Subsequent execution of svm_range_set_attr function attempts to dereference this null pointer, leading to immediate system crash and potential denial of service conditions. This vulnerability directly maps to CWE-476 which describes Null Pointer Dereference, and represents a fundamental failure in input validation and state management within kernel space drivers.
The operational impact of this vulnerability extends beyond simple system instability, as it can be exploited by malicious users to cause system crashes or potentially facilitate privilege escalation attacks. The vulnerability affects systems running Linux kernels with AMD GPU support where the amdkfd driver is enabled, making it particularly concerning for servers and workstation environments that rely on GPU acceleration. Attackers could leverage this weakness to repeatedly crash system services or applications that depend on GPU memory management, resulting in service disruption and potential data loss.
Mitigation strategies should focus on implementing proper input validation within the kernel driver code to ensure process_info is properly initialized before any memory operations are performed. The fix involves adding null pointer checks and appropriate error handling before accessing the process_info structure, preventing the kernel from attempting to dereference uninitialized pointers. System administrators should ensure timely application of kernel updates that contain this specific patch, while also considering runtime monitoring solutions that can detect anomalous behavior patterns associated with null pointer dereferences. The vulnerability highlights the importance of maintaining proper API call sequencing in kernel drivers and aligns with ATT&CK technique T1068 which covers exploit for privilege escalation through kernel vulnerabilities. Organizations should implement comprehensive testing procedures for kernel modules and maintain strict adherence to security best practices when developing or modifying driver code to prevent similar issues from occurring in production environments.