Improper input validation in Linux kernel - CVE-2026-43348
Published: May 9, 2026
Vulnerability identifier: #VU130841
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-43348
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-43348
Install security update from vendor's repository.