SB20260626199 - Always-Incorrect Control Flow Implementation in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-53155)

CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation

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 handling of device-private PMD entry flags in set_pmd_migration_entry() in mm/huge_memory.c when processing device-private huge page migration entries. A local user can trigger page migration and write activity on a crafted memory range to cause a denial of service.

The issue can corrupt rmap state and trigger a kernel assertion during migration of device-private THP ranges.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/43e7f189769c512c843184a8a5892ac779a6bd90
• https://git.kernel.org/stable/c/d7251c8d3f7cea76543abac6cf4ed15582c10846