CVE-2023-53256: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-53256 affects the Linux kernel's firmware arm_ffa component, specifically related to the handling of FFA device names for logical partitions. The vulnerability was discovered and disclosed in September 2025, impacting systems using the Linux kernel's ARM FF-A (Firmware Framework for Arm) implementation (NVD).

The vulnerability stems from a failure in registering multiple logical partitions or services within a physical partition. The issue occurs because the device name contains only VM ID while both VM ID and UUID are maintained in the partition information. Each physical partition can provide multiple services with unique UUIDs, and each service can be presented as a logical partition with a distinct combination of VM ID and UUID. The number of distinct UUIDs in a system will be less than or equal to the number of logical partitions (NVD).

When exploited, the vulnerability causes the kernel to fail when attempting to register more than one logical partition or service within a physical partition. This results in error messages and failed partition registration, potentially affecting system functionality and service availability (NVD).

The vulnerability has been resolved in the Linux kernel through a fix that implements proper handling of FFA device names for logical partitions. The solution involves using ida_alloc() to allocate a unique ID and appending it to 'arm-ffa' to create unique device names (NVD).