CVE-2025-38036

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/xe/vf: Perform early GT MMIO initialization to read GMDID<br /> <br /> VFs need to communicate with the GuC to obtain the GMDID value<br /> and existing GuC functions used for that assume that the GT has<br /> it&amp;#39;s MMIO members already setup. However, due to recent refactoring<br /> the gt-&gt;mmio is initialized later, and any attempt by the VF to use<br /> xe_mmio_read|write() from GuC functions will lead to NPD crash due<br /> to unset MMIO register address:<br /> <br /> [] xe 0000:00:02.1: [drm] Running in SR-IOV VF mode<br /> [] xe 0000:00:02.1: [drm] GT0: sending H2G MMIO 0x5507<br /> [] BUG: unable to handle page fault for address: 0000000000190240<br /> <br /> Since we are already tweaking the id and type of the primary GT to<br /> mimic it&amp;#39;s a Media GT before initializing the GuC communication,<br /> we can also call xe_gt_mmio_init() to perform early setup of the<br /> gt-&gt;mmio which will make those GuC functions work again.