Improper input validation in Linux kernel - CVE-2026-43348

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Main Vulnerability Database Vulnerabilities #VU130841

Improper input validation in Linux kernel - CVE-2026-43348

Published: May 9, 2026


Vulnerability identifier: #VU130841
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-43348
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper input validation in the mshv_vtl VTL0 memory registration logic when handling a crafted MSHV_ADD_VTL0_MEMORY request. A local user can register a sufficiently aligned memory range to cause a denial of service.

The issue is triggered when the computed vmemmap_shift exceeds MAX_FOLIO_ORDER, causing memremap_pages() to emit a warning and fail with -EINVAL.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi (Ubuntu package)

How to mitigate CVE-2026-43348

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-27.27
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14

External References

Related Security Bulletins