CVE-2026-43347

Summary

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

arm64: dts: qcom: monaco: Reserve full Gunyah metadata region

We observe spurious "Synchronous External Abort" exceptions (ESR=0x96000010) and kernel crashes on Monaco-based platforms. These faults are caused by the kernel inadvertently accessing hypervisor-owned memory that is not properly marked as reserved.

>From boot log, The Qualcomm hypervisor reports the memory range at 0x91a80000 of size 0x80000 (512 KiB) as hypervisor-owned: qhee_hyp_assign_remove_memory: 0x91a80000/0x80000 -> ret 0

However, the EFI memory map provided by firmware only reserves the subrange 0x91a40000–0x91a87fff (288 KiB). The remaining portion (0x91a88000–0x91afffff) is incorrectly reported as conventional memory (from efi debug): efi: 0x000091a40000-0x000091a87fff [Reserved…] efi: 0x000091a88000-0x0000938fffff [Conventional…]

As a result, the allocator may hand out PFNs inside the hypervisor owned region, causing fatal aborts when the kernel accesses those addresses.

Add a reserved-memory carveout for the Gunyah hypervisor metadata at 0x91a80000 (512 KiB) and mark it as no-map so Linux does not map or allocate from this area.

For the record: Hyp version: gunyah-e78adb36e debug (2025-11-17 05:38:05 UTC) UEFI Ver: 6.0.260122.BOOT.MXF.1.0.c1-00449-KODIAKLA-1

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/edde62571f7602d83243ca51729ce42d22ea04d2
• https://git.kernel.org/stable/c/59bd9088336d2bb7e713dcf4df5cbda86bb3c611
• https://git.kernel.org/stable/c/85d98669fa7f1d3041d962515e45ee6e392db6f8

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