CVE-2023-54138 in Linux
Summary
by MITRE • 12/24/2025
In the Linux kernel, the following vulnerability has been resolved:
drm/msm: fix NULL-deref on irq uninstall
In case of early initialisation errors and on platforms that do not use the DPU controller, the deinitilisation code can be called with the kms pointer set to NULL.
Patchwork: https://patchwork.freedesktop.org/patch/525104/
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Analysis
by VulDB Data Team • 01/03/2026
The vulnerability CVE-2023-54138 represents a critical null pointer dereference issue within the Linux kernel's display subsystem, specifically affecting the drm/msm driver component. This flaw manifests during the interrupt uninitialization phase of graphics hardware management, where the kernel fails to properly validate pointer states before attempting memory access operations. The vulnerability occurs in the display media subsystem module responsible for managing graphics hardware interfaces, particularly impacting devices that utilize the msm (mobile system module) driver framework for graphics processing.
The technical root cause of this vulnerability stems from inadequate error handling during the early initialization sequence of display hardware components. When initialization errors occur prematurely within the graphics subsystem, or when operating on platforms that do not employ the DPU (Display Processing Unit) controller, the deinitialization routine attempts to execute with a kms (kernel mode setting) pointer that has been set to NULL. This condition creates a classic null pointer dereference scenario where the kernel's memory management system attempts to access memory through a null reference, leading to potential system crashes or unauthorized code execution.
This vulnerability operates at the kernel level within the graphics driver framework, specifically within the direct rendering manager subsystem that manages display hardware resources. The operational impact extends beyond simple system instability to potentially enable privilege escalation attacks, as the null pointer dereference could be exploited to gain unauthorized access to kernel memory spaces. The vulnerability affects systems running Linux kernels with the drm/msm driver implementation, particularly those managing mobile graphics hardware or embedded systems with specialized display controllers. Attackers could potentially leverage this flaw to cause denial of service conditions or potentially execute arbitrary code with kernel privileges.
The fix for CVE-2023-54138 involves implementing proper null pointer validation within the deinitialization routine of the drm/msm driver. This patch ensures that the kms pointer is checked for null values before any memory access operations occur during interrupt uninitialization. The mitigation strategy aligns with common security practices for preventing null pointer dereference vulnerabilities and follows established patterns for kernel-level error handling. This fix represents a defensive programming approach that prevents the kernel from attempting to access invalid memory references during error recovery sequences. The solution adheres to security best practices outlined in various cybersecurity frameworks and directly addresses the weakness identified in CWE-476, which specifically covers null pointer dereference vulnerabilities in software systems.
Systems administrators should prioritize applying the kernel patch provided by the Linux kernel maintainers to address this vulnerability. The patch should be integrated into production environments as part of regular security maintenance procedures, particularly in embedded systems or mobile devices where the msm driver is actively utilized. Organizations using Linux-based systems with graphics hardware management should conduct thorough testing of the patched kernel to ensure compatibility with existing display subsystem configurations. The vulnerability demonstrates the importance of proper error handling in kernel modules and highlights the need for comprehensive testing of edge cases during hardware initialization sequences. This flaw serves as a reminder of the critical security implications that can arise from seemingly minor programming errors in kernel-level drivers, particularly those managing hardware resources with direct memory access capabilities.