CVE-2026-72268 in Linux
Summary
by MITRE • 08/15/2026
In the Linux kernel, the following vulnerability has been resolved:
fbdev: tdfxfb: fix potential memory leak in tdfxfb_probe()
In tdfxfb_probe(), the memory allocated for modelist using fb_videomode_to_modelist() when CONFIG_FB_3DFX_I2C is defined, is not freed in the subsequent error paths. 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 memory leak scenario within the tdfxfb driver implementation that could potentially impact system stability and resource utilization over time. This flaw specifically affects systems with 3dfx graphics hardware support where the CONFIG_FB_3DFX_I2C configuration option is enabled, creating a condition where allocated memory structures are not properly released during error handling paths.
The technical root cause stems from improper memory management within the tdfxfb_probe() function where fb_videomode_to_modelist() allocates memory to store video mode information for 3dfx framebuffer devices. When the driver initialization encounters an error condition subsequent to this memory allocation, the cleanup path fails to invoke fb_destroy_modelist() to release the previously allocated resources. This creates a classic memory leak pattern where kernel memory becomes permanently unavailable even though the driver initialization has failed and the system should be returning to a stable state.
The operational impact of this vulnerability extends beyond simple resource waste to potentially affect long-running systems or those with frequent driver initialization cycles. While individual memory leaks may seem minor, in embedded systems or server environments where multiple driver probes occur regularly, accumulated memory consumption could lead to performance degradation or even system instability. The issue particularly affects systems where the 3dfx framebuffer driver is loaded and unloaded frequently or where error conditions during probe operations are common.
From a cybersecurity perspective, this vulnerability aligns with CWE-401 Memory Leak as it represents improper resource management within kernel space code that could be exploited to consume available memory resources over time. The flaw does not directly create an attack surface for privilege escalation or arbitrary code execution but could contribute to denial of service conditions that might be leveraged by malicious actors seeking to destabilize systems. According to ATT&CK framework, this vulnerability would fall under the T1499 technique category related to resource exhaustion attacks where system resources are consumed through improper memory management.
The fix implemented addresses the specific memory management issue by ensuring that fb_destroy_modelist() is called in all error paths following the initial allocation. This change maintains proper resource cleanup semantics and aligns with kernel development best practices for error handling and resource management. The solution demonstrates adherence to defensive programming principles where every allocated resource must have a corresponding deallocation path, regardless of execution flow.
This vulnerability resolution highlights the importance of comprehensive error path testing in kernel development environments where memory allocation and deallocation must be carefully balanced. The fix ensures that driver initialization failures do not leave the system in an inconsistent state with leaked resources, maintaining overall system integrity and preventing potential cascading effects that could impact other subsystems relying on proper memory management. The remediation approach follows established patterns for kernel memory management and represents a standard defensive coding practice that should be applied to similar driver implementations across the Linux kernel ecosystem.