CVE-2026-43347 (GCVE-0-2026-43347)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:39 – Updated: 2026-08-05 12:27
VLAI
Title
arm64: dts: qcom: monaco: Reserve full Gunyah metadata region
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
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7be190e4bdd2bd1aca84afef06bb755c06a85473 , < edde62571f7602d83243ca51729ce42d22ea04d2 (git)
Affected: 7be190e4bdd2bd1aca84afef06bb755c06a85473 , < 59bd9088336d2bb7e713dcf4df5cbda86bb3c611 (git)
Affected: 7be190e4bdd2bd1aca84afef06bb755c06a85473 , < 85d98669fa7f1d3041d962515e45ee6e392db6f8 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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                "integrityImpact": "NONE",
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      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:37:03+00:00",
      "cve": "CVE-2026-43347",
      "id": "CVE-2026-43347",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: arm64: dts: qcom: monaco: Reserve full Gunyah metadata region",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43347.json",
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}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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