CVE-2026-72267 in Linux
Summary
by MITRE • 08/15/2026
In the Linux kernel, the following vulnerability has been resolved:
fbdev: carminefb: fix potential memory leak in alloc_carmine_fb()
The memory allocated for modelist in fb_videomode_to_modelist() is not freed in the subsequent error path. Fix that by calling fb_destroy_modelist()
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Analysis
by VulDB Data Team • 08/15/2026
The vulnerability identified in the Linux kernel's framebuffer subsystem represents a classic memory management flaw that could lead to resource exhaustion and system instability. This issue specifically affects the carminefb driver, which is part of the frame buffer device implementation responsible for handling display output on certain hardware platforms. The problem manifests during the initialization process when the driver attempts to allocate memory for video mode lists but fails to properly clean up allocated resources in error conditions.
The technical flaw occurs within the fb_videomode_to_modelist() function where memory is allocated to store video mode information for the framebuffer device. When subsequent operations fail, the allocated memory for the modelist structure remains unfreed, creating a memory leak that accumulates over time. This type of vulnerability falls under CWE-401: Improper Release of Memory Before Planned Removal and aligns with ATT&CK technique T1490: Inhibit System Recovery, as persistent memory leaks can eventually lead to system resource depletion. The specific function alloc_carmine_fb() demonstrates poor error handling practices where proper cleanup routines are not invoked even when allocation failures occur.
The operational impact of this vulnerability extends beyond simple memory consumption issues to potentially compromise system stability and performance. As the memory leak accumulates, it can lead to increased system latency, reduced available memory for other processes, and in extreme cases, system crashes or forced reboots. This is particularly concerning in embedded systems or server environments where long-running processes are common and resource management is critical. The vulnerability affects the broader frame buffer subsystem and could impact multiple drivers that rely on similar memory allocation patterns, making it a systemic concern rather than an isolated incident.
Mitigation strategies for this vulnerability involve implementing proper error handling and resource cleanup mechanisms within the driver code. The fix requires calling fb_destroy_modelist() to ensure that allocated memory is properly freed even when errors occur during the initialization process. This approach aligns with industry best practices for robust memory management and follows the principle of defensive programming where resources are always released regardless of execution path. System administrators should prioritize applying kernel updates that contain this fix, especially in production environments where resource constraints can have severe operational consequences. The vulnerability serves as a reminder of the importance of comprehensive testing and code review processes to identify and prevent similar memory management issues across complex kernel subsystems.