SB2026052864 - Improper input validation in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-46013)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3538f90ab89aaf302782b4b073a0aae66904cd67
• https://git.kernel.org/stable/c/bd0d6bde286a2b8e3ae7975b0dcc2d43875d5fc9