{"id":"CVE-2025-40311","title":"In the Linux kernel, the following vulnerability has been resolved:\n\naccel/habanalabs: support mapping cb with vmalloc-backed coherent memory\n\nWhen IOMMU is enabled, dma_alloc_coherent() with GFP_USER may return\naddresses from the vmallo…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\naccel/habanalabs: support mapping cb with vmalloc-backed coherent memory\n\nWhen IOMMU is enabled, dma_alloc_coherent() with GFP_USER may return\naddresses from the vmallo…","severity":"none","published":"2025-12-08","updated":"2026-10-14","sourceUpdated":"2026-10-14T22:10:00.210","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-40311","references":[{"url":"https://git.kernel.org/stable/c/513024d5a0e34fd34247043f1876b6138ca52847","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/73c7c2cdb442fc4160d2a2a4bfffbd162af06cb9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7ec8ac9f73d4a9438c2186768d6de27ace37531e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d1dfe21a332d38a6a09658ec29a55940afb5fe36","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00186,"epssPercentile":0.07629,"ingestedAt":"2026-10-14T23:00:02.021Z","slug":"CVE-2025-40311","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\naccel/habanalabs: support mapping cb with vmalloc-backed coherent memory\n\nWhen IOMMU is enabled, dma_alloc_coherent() with GFP_USER may return\naddresses from the vmalloc range. If such an address is mapped without\nVM_MIXEDMAP, vm_insert_page() will trigger a BUG_ON due to the\nVM_PFNMAP restriction.\n\nFix this by checking for vmalloc addresses and setting VM_MIXEDMAP\nin the VMA before mapping. This ensures safe mapping and avoids kernel\ncrashes. The memory is still driver-allocated and cannot be accessed\ndirectly by userspace.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}