CVE-2026-72269 in Linux
Summary
by MITRE • 08/15/2026
In the Linux kernel, the following vulnerability has been resolved:
fbdev: uvesafb: fix potential memory leak in uvesafb_probe()
Due to an incorrect goto label, memory allocated for modedb and modelist in uvesafb_vbe_init() is not freed in some error paths. Fix this by updating the goto label.
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Analysis
by VulDB Data Team • 08/15/2026
The vulnerability identified in the Linux kernel's framebuffer device driver specifically affects the uvesafb module which handles VESA Universal Video Interface drivers. This memory leak occurs within the uvesafb_probe function where the code fails to properly clean up allocated memory resources during error conditions. The root cause stems from an incorrect goto label implementation that prevents proper resource deallocation when initialization paths encounter failures, creating a persistent memory consumption issue that could lead to system instability over time.
The technical flaw resides in the memory management logic of uvesafb_vbe_init() function where modedb and modelist structures are allocated but not properly freed when error conditions occur. This represents a classic memory leak pattern where allocated kernel memory remains unreleased due to incorrect control flow handling through goto statements. The improper label usage creates unreachable code paths that bypass the cleanup routines, leaving allocated memory in the kernel's address space without proper deallocation mechanisms.
Operationally, this vulnerability presents a significant risk for systems running Linux kernels with framebuffer drivers, particularly in embedded environments or server configurations where continuous operation is critical. The memory leak could gradually consume available system resources, potentially leading to reduced performance, system instability, or even complete system hangs under sustained load conditions. While the immediate impact may appear limited to memory consumption, cumulative effects could severely degrade system responsiveness and reliability.
The fix implemented addresses this issue by correcting the goto label references to ensure proper resource cleanup occurs regardless of error paths encountered during uvesafb probe execution. This modification aligns with best practices for kernel memory management and follows established patterns for handling resource allocation failures in Linux device drivers. The solution directly addresses the CWE-401 weakness category related to improper resource cleanup and ensures compliance with kernel development standards that mandate proper error path handling.
Security implications extend beyond simple resource consumption as memory leaks can potentially be exploited by malicious actors to cause denial of service conditions or create opportunities for additional attack vectors. The vulnerability demonstrates the importance of rigorous code review processes for kernel-level memory management and highlights how seemingly minor control flow issues can have significant operational consequences. System administrators should prioritize applying this fix to maintain optimal system stability and prevent potential exploitation scenarios that could compromise overall security posture.
This remediation process exemplifies the critical nature of proper error handling in kernel space where resource leaks can accumulate over time and affect system reliability. The fix ensures that all allocated memory within the uvesafb initialization sequence is properly accounted for and released, maintaining the integrity of the kernel's memory management subsystem. Such vulnerabilities underscore the necessity of comprehensive testing and code review processes specifically focused on error path validation in operating system components where resource management directly impacts system stability and security.