CVE-2024-14040
Description
A flaw was found in the Linux kernel's nexthop networking component. The system uses a weight field to manage network traffic distribution, particularly in complex network environments known as CLOS networks. This field was limited to an 8-bit value, which is insufficient for modern, high-scale network configurations. A local attacker could potentially exploit this limitation, leading to incorrect network traffic handling, which may result in a denial of service (making network services unavailable) or the disclosure of sensitive network information.
Statement
This Moderate impact vulnerability in the Linux kernel addresses a potential for numerical errors when configuring Equal-Cost Multi-Path (ECMP) weights in CLOS networks. The issue arises from an insufficient 8-bit weight field, which could lead to incorrect weight ratios in deployments with high fan-out. Exploitation requires specific userspace configurations attempting to utilize weights exceeding 8 bits.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
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 | 7.1 | N/A | 7.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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