CVE-2025-40311

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> accel/habanalabs: support mapping cb with vmalloc-backed coherent memory<br /> <br /> When IOMMU is enabled, dma_alloc_coherent() with GFP_USER may return<br /> addresses from the vmalloc range. If such an address is mapped without<br /> VM_MIXEDMAP, vm_insert_page() will trigger a BUG_ON due to the<br /> VM_PFNMAP restriction.<br /> <br /> Fix this by checking for vmalloc addresses and setting VM_MIXEDMAP<br /> in the VMA before mapping. This ensures safe mapping and avoids kernel<br /> crashes. The memory is still driver-allocated and cannot be accessed<br /> directly by userspace.