Linux Kernel BMG_VF Sysfs Attribute Exposure Vulnerability

A vulnerability in the Linux kernel's handling of virtual functions (VFs) in the BattleMage platform has been addressed. VFs are unable to read the BMG_PCIE_CAP register or access PCODE due to existing safeguards. As a result, attributes requiring these elements were inadvertently exposed, leading to errors when VFs attempted to access the inaccessible register. This issue has been resolved by modifying the sysfs attribute exposure to align with the capabilities of VFs.

Impact

Exploitation of this vulnerability could cause virtual functions to attempt to read inaccessible registers, leading to errors and potential disruption in normal operations.