CVE-2025-40311
Published: December 9, 2025Last modified: November 3, 2026
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.
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.191-r0) |
| 25 LTS | linux-lts | Fixed (6.12.58-r0) | |
| Stream | linux-lts | Fixed (6.18.35-r1) |
References
- https://git.kernel.org/stable/c/513024d5a0e34fd34247043f1876b6138ca52847
- https://git.kernel.org/stable/c/73c7c2cdb442fc4160d2a2a4bfffbd162af06cb9
- https://git.kernel.org/stable/c/7ec8ac9f73d4a9438c2186768d6de27ace37531e
- https://git.kernel.org/stable/c/8de421db5b1b2b37e9643ea7f6ade90fd756892d
- https://git.kernel.org/stable/c/d1dfe21a332d38a6a09658ec29a55940afb5fe36