Improper input validation in Linux kernel - CVE-2026-46013
Published: May 28, 2026
Vulnerability identifier: #VU132477
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-2026-46013
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 memfd_luo_retrieve_folios() cleanup path when processing folios during cleanup. A local user can trigger cleanup on crafted folio state to cause a denial of service.
The issue involves incorrect handling of raw PFN values during physical address restoration and missing checks for sparse file holes where pfn=0.
How to mitigate CVE-2026-46013
Install security update from vendor's repository.