CVE-2024-43905 in Linux
Summary
by MITRE • 08/26/2024
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/pm: Fix the null pointer dereference for vega10_hwmgr
Check return value and conduct null pointer handling to avoid null pointer dereference.
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Analysis
by VulDB Data Team • 10/08/2024
The vulnerability identified as CVE-2024-43905 resides within the Linux kernel's graphics subsystem, specifically affecting the AMD GPU power management driver component. This issue manifests in the drm/amd/pm subsystem where the vega10_hwmgr function fails to properly validate return values before proceeding with pointer operations. The flaw represents a classic null pointer dereference vulnerability that can occur during GPU power management operations on AMD Vega 10 series hardware. The vulnerability impacts systems utilizing AMD graphics hardware where the kernel attempts to access memory through a null pointer reference, potentially leading to system instability or crashes.
The technical implementation of this vulnerability stems from inadequate error handling within the power management driver code. When the vega10_hwmgr function processes certain power management requests, it fails to verify whether critical return values from preceding operations are null before attempting to dereference them. This pattern violates fundamental software safety principles and creates a path for malicious actors or faulty system conditions to trigger the null pointer dereference. The issue aligns with CWE-476 which specifically addresses null pointer dereference vulnerabilities, and represents a failure in input validation and error handling mechanisms. The vulnerability operates at the kernel level where such flaws can have severe consequences due to the privileged execution context and direct hardware access capabilities.
The operational impact of this vulnerability extends beyond simple system crashes to potentially enable more sophisticated attack vectors. When a null pointer dereference occurs in kernel space, it can result in system panics, complete system crashes, or in some cases provide opportunities for privilege escalation attacks. The vulnerability affects systems running Linux kernels with AMD GPU support, particularly those utilizing Vega 10 series graphics processors where the power management subsystem is actively engaged. This type of vulnerability can be exploited by attackers who can trigger specific GPU power management scenarios, potentially leading to denial of service conditions or unauthorized system access. The ATT&CK framework categorizes this under privilege escalation and denial of service techniques, as kernel-level null pointer dereferences can be leveraged to compromise system integrity and availability.
Mitigation strategies for CVE-2024-43905 require immediate kernel updates from vendors who have addressed the issue in their patched releases. System administrators should prioritize applying the latest kernel security patches that include the fix for the vega10_hwmgr null pointer dereference. The fix implemented involves adding proper return value validation and null pointer checks before any pointer dereference operations occur in the power management driver. Additionally, monitoring systems should be configured to detect unusual GPU power management activity that might indicate exploitation attempts. Organizations should also consider implementing kernel lockdown mechanisms and restricting access to GPU power management interfaces where possible. The fix demonstrates proper defensive programming practices that align with industry standards for kernel development and security hardening. Regular kernel security assessments and vulnerability scanning should be conducted to identify similar issues in other subsystems and maintain overall system security posture.