CVE-2025-68176

Vulnerability

Analysis

CVE-2025-68176 is a NULL pointer dereference vulnerability in the Linux kernel's Cadence PCIe controller driver (pcie-cadence). The root cause is that the cdns_pcie::ops pointer may not be populated by all glue drivers that interface with the Cadence core. The upcoming Sophgo platform, which does not set the ops. The driver previously accessed this pointer without a NULL check, leading to a potential crash when the pointer is NULL [1][2][3].

Exploitation

An attacker could trigger this vulnerability by causing the system to use a Cadence PCIe controller with a glue driver that does not initialize the ops structure. This requires local access to the system and the ability to trigger PCIe controller operations, such as through device enumeration or power management events. No special privileges beyond normal user access are needed to trigger the vulnerable code path.

Impact

Successful exploitation results in a kernel NULL pointer dereference, which causes a system crash (kernel panic) or denial of service. This can lead to system instability and unavailability. There is no evidence of privilege escalation or data corruption from this vulnerability.

Mitigation

The fix has been applied to the Linux kernel stable tree in commits [1], [2], and [3]. Users should update their kernel to a version containing these commits. No workarounds are available other than applying the patch.