EUVD-2026-28631
GHSA-m2rg-757j-v6hh
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionNVD
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
AnalysisAI
Memory corruption in Linux kernel on Qualcomm Monaco-based ARM64 platforms causes kernel crashes through synchronous external aborts when accessing hypervisor-owned memory incorrectly marked as conventional RAM. The firmware's EFI memory map only reserves 288 KiB of a 512 KiB Gunyah hypervisor metadata region (0x91a80000-0x91afffff), leaving 224 KiB exploitable for triggering fatal aborts. …
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RemediationAI
Within 24 hours: Inventory all systems running Linux kernel on Qualcomm Monaco ARM64 platforms and identify current kernel versions. Within 7 days: Apply vendor-released patches to kernel versions 6.18.24, 6.19.14, or 7.0 series as appropriate for your deployment. …
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