Linux Kernel PCI Bridge Framebuffer Relocation Vulnerability

A vulnerability in the Linux kernel related to improper handling of framebuffer memory addresses for PCI graphics devices can lead to invalid access to I/O memory. During boot, firmware may assign different memory offsets to PCI host bridges, relocating framebuffer addresses as seen by the kernel. This issue affects several Linux kernel versions. The vulnerability has been addressed by updating the screen_info structure to reflect the correct framebuffer locations after relocation, ensuring proper access to the I/O memory resources of PCI graphics devices.

Impact

The vulnerability could cause invalid access to I/O memory, potentially leading to undefined behavior or system instability.