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Unrated severityNVD Advisory· Published Dec 8, 2025· Updated Apr 15, 2026

CVE-2025-40311

CVE-2025-40311

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.

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Affected products

104

Patches

Vulnerability mechanics

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