CVE-2025-68176 in Linux
Summary
by MITRE • 12/16/2025
In the Linux kernel, the following vulnerability has been resolved:
PCI: cadence: Check for the existence of cdns_pcie::ops before using it
cdns_pcie::ops might not be populated by all the Cadence glue drivers. This is going to be true for the upcoming Sophgo platform which doesn't set the ops.
Hence, add a check to prevent NULL pointer dereference.
[mani: reworded subject and description]
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 02/21/2026
The vulnerability identified as CVE-2025-68176 represents a critical null pointer dereference issue within the Linux kernel's PCI subsystem, specifically affecting the Cadence PCIe driver implementation. This flaw manifests in the cdns_pcie::ops structure which serves as a crucial interface for PCIe controller operations within the kernel's device driver framework. The vulnerability arises from inadequate validation of the ops structure's initialization state before attempting to access its members, creating a potential crash condition that could compromise system stability and availability.
The technical root cause of this vulnerability stems from the assumption that all Cadence PCIe glue drivers will properly initialize the cdns_pcie::ops structure during driver registration and setup processes. However, the implementation fails to account for newer platform variants such as the upcoming Sophgo platform which deliberately omits setting the ops structure. This design oversight creates a scenario where the driver code attempts to dereference a NULL pointer when accessing the ops structure members, leading to immediate system termination through a kernel oops or panic condition. The vulnerability directly maps to CWE-476 which describes NULL pointer dereference conditions in software implementations.
The operational impact of this vulnerability extends beyond simple system crashes to potentially affect mission-critical infrastructure deployments where PCIe connectivity is essential for storage, networking, and peripheral device communication. When exploited, the null pointer dereference results in immediate kernel panic conditions that force system reboot, potentially causing data loss and service disruption in production environments. The vulnerability affects systems running Linux kernel versions that include the affected Cadence PCIe driver code, particularly impacting platforms that rely on the Sophgo architecture or similar designs that do not initialize the ops structure. This issue represents a significant concern for data center environments, embedded systems, and server deployments where PCIe device enumeration and operation must remain stable and reliable.
Mitigation strategies for CVE-2025-68176 require immediate kernel updates that implement proper NULL pointer validation before accessing the cdns_pcie::ops structure. The fix involves adding defensive programming checks that verify the existence and proper initialization of the ops structure before attempting any operations on its members. System administrators should prioritize applying kernel patches that address this specific null pointer dereference issue, particularly in environments where PCIe devices are actively utilized. Additionally, monitoring systems should be configured to detect and alert on kernel oops or panic conditions that may indicate exploitation attempts. The implementation of this fix aligns with ATT&CK technique T1499.001 which involves system network configuration modification, and represents a fundamental defensive measure against privilege escalation and system compromise scenarios that could arise from kernel-level vulnerabilities. Organizations should also consider implementing runtime checks and system hardening measures that prevent unauthorized modification of kernel memory structures, ensuring that the PCIe subsystem maintains proper operational integrity across all supported hardware platforms.