CVE-2026-72264 in Linux
Summary
by MITRE • 08/15/2026
In the Linux kernel, the following vulnerability has been resolved:
fbdev: tridentfb: fix potential memory leak in trident_pci_probe()
In trident_pci_probe(), the memory allocated for modelist using fb_videomode_to_modelist() is not freed in subsequent error paths. Fix that by calling fb_destroy_modelist().
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Analysis
by VulDB Data Team • 08/15/2026
The vulnerability resides within the linux kernel's framebuffer device driver specifically targeting the tridentfb implementation which handles graphics hardware from Trident Microsystems. This memory leak occurs during the PCI probe phase when the driver attempts to initialize hardware capabilities and establish video mode support. The flaw manifests when the driver allocates memory for storing video mode information through the fb_videomode_to_modelist() function but fails to properly release this memory allocation in error handling code paths that occur during driver initialization or hardware detection failures.
The technical implementation involves the trident_pci_probe() function which serves as the primary entry point for detecting and initializing Trident graphics hardware over PCI bus connections. When this function encounters an error condition during setup operations, it follows alternative code paths that bypass proper memory cleanup routines. The fb_videomode_to_modelist() call allocates kernel memory to store video mode definitions that describe supported display resolutions and timing parameters for the graphics hardware. However, subsequent error handling logic does not invoke fb_destroy_modelist() to release this allocated memory, creating a persistent memory leak that accumulates over time.
The operational impact of this vulnerability extends beyond simple resource consumption as it represents a denial of service vector capable of degrading system performance or causing complete system instability. Each driver initialization failure results in a memory leak that compounds over multiple hardware detection attempts or system reboots. In high-availability systems or embedded environments where drivers may be repeatedly loaded and unloaded, this leak can consume significant portions of available kernel memory, potentially leading to system crashes or preventing proper hardware initialization. The vulnerability affects systems running linux kernel versions prior to the fix, particularly those utilizing older trident graphics hardware configurations.
Mitigation strategies for this vulnerability encompass both immediate patching and operational monitoring approaches. The primary solution involves applying the official kernel patch that ensures fb_destroy_modelist() is called in all error paths within trident_pci_probe(). System administrators should prioritize updating their kernel installations to versions containing this fix while maintaining proper memory monitoring to detect potential leaks in older systems. Additional defensive measures include implementing regular system restart schedules to clear accumulated memory leaks, monitoring kernel memory usage patterns through diagnostic tools, and ensuring proper driver initialization logging to identify problematic hardware detection sequences. This vulnerability aligns with CWE-401 which catalogs improper cleanup of memory resources and demonstrates how seemingly minor oversight in error handling can create persistent security and stability concerns within kernel subsystems. From an operational security perspective, this represents a typical example of how the ATT&CK framework's technique T1547.006 for privilege escalation through kernel module manipulation could be leveraged if attackers exploit memory leaks to cause system instability or resource exhaustion conditions that might enable further compromise.