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Linux KernelOperating system · Linux

CVE-2026-43347

HIGH · 7.5 CVSS v3.1 Published 2026-05-08
Fix available
A fix is available. Upgrade to 6.18.24 / 6.19.14 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 6.14, < 6.18.24>= 6.19, < 6.19.14= 7.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 6.18.24 / 6.19.14 or later
Fixed in 6.18.246.19.14
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux Kernel 6.18.24, 6.19.14, or 7.1 (or later stable releases)

  1. Identify the current running kernel version using `uname -r`
  2. Upgrade the Linux kernel to version 6.18.24 or later within the 6.14-6.18.x branch
  3. Alternatively, upgrade to version 6.19.14 or later within the 6.19.x branch
  4. Alternatively, upgrade to version 7.1 or later within the 7.x branch
  5. After kernel upgrade, ensure the device tree blob (DTB) for the affected Qualcomm Monaco platform is also updated to include the reserved-memory carveout for Gunyah hypervisor metadata at 0x91a80000 (512 KiB)
  6. Verify the fix by checking dmesg for EFI memory map reservations - the range 0x91a80000-0x91afffff should now appear as [Reserved] rather than [Conventional]
Caveat Minimal risk - this is a device tree memory reservation fix that prevents kernel crashes; it does not change kernel functionality but does reduce available memory by 512 KiB on affected platforms

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-43347 in production — separate from our analysis above.

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