CVE-2025-40311

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

accel/habanalabs: support mapping cb with vmalloc-backed coherent memory

When IOMMU is enabled, dma_alloc_coherent() with GFP_USER may return

addresses from the vmalloc range. If such an address is mapped without

VM_MIXEDMAP, vm_insert_page() will trigger a BUG_ON due to the

VM_PFNMAP restriction.

Fix this by checking for vmalloc addresses and setting VM_MIXEDMAP

in the VMA before mapping. This ensures safe mapping and avoids kernel

crashes. The memory is still driver-allocated and cannot be accessed

directly by userspace.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References