CVE-2025-40153
Description
A flaw was found in the Linux kernel. A local user with the ability to allocate or utilize large transparent huge pages (hugetlb) memory regions could trigger a system-wide Denial of Service (DoS). This occurs when the mprotect() function is applied to these large hugetlb areas, causing the kernel to enter a prolonged loop without allowing other processes to run, leading to a CPU soft-lockup. This vulnerability stems from the hugetlb_change_protection() function lacking appropriate rescheduling points during operations on extensive memory ranges.
Statement
hugetlb_change_protection() performs long-running loops when mprotect() is applied to very large hugetlb ranges, causing CPU soft-lockups because no rescheduling point exists. Any local user who can allocate or use large hugetlb regions can trigger the stall by calling mprotect() over hundreds of gigabytes.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU)
Inconsistent locking discipline can lead to deadlock.
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