PT-2026-38998 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43347

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description On Monaco-based platforms, the kernel may inadvertently access memory owned by the Gunyah hypervisor because a portion of the hypervisor metadata region is incorrectly reported as conventional memory instead of reserved. This occurs because the EFI memory map only reserves a subrange of the required memory, leading the allocator to potentially assign Page Frame Numbers (PFNs) within the hypervisor-owned region. Such access results in kernel crashes and Synchronous External Abort exceptions.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-43347

Affected Products

Linux Kernel

References · 12

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43347 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43347 · Vendor Advisory
• https://git.kernel.org/stable/c/59bd9088336d2bb7e713dcf4df5cbda86bb3c611 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-43347 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43347 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43347 · Security Note
• https://git.kernel.org/stable/c/85d98669fa7f1d3041d962515e45ee6e392db6f8 · Patch
• https://git.kernel.org/stable/c/edde62571f7602d83243ca51729ce42d22ea04d2 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43347 · Security Note
• https://twitter.com/CVEnew/status/2052811029143302626 · Twitter Post
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post
• https://git.kernel.org/linus/85d98669fa7f1d3041d962515e45ee6e392db6f8 · Note