CVE-2024-56706
Description
A flaw was found in the Linux kernel's s390 CPU-measurement sampling facility. This vulnerability allows a local user to cause a Denial of Service (DoS) through resource exhaustion or kernel instability. Because memory allocation for the Performance Monitoring Unit (PMU) is executed without proper lock synchronization, concurrent performance event requests can trigger duplicate buffer allocations for the same hardware unit.
Statement
This vulnerability is rated as Low severity because exploitation is restricted to local execution on IBM Z (s390x) systems and requires winning a race condition between simultaneous performance monitoring requests. The scope of the flaw is limited to the s390x platform, meaning deployments across other CPU architectures are unaffected. Additionally, the consequences are limited to redundant buffer allocations causing resource exhaustion or localized denial of service, without enabling privilege escalation or information disclosure.
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 | 3.3 | 6.3 | 7.8 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | High | Low |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | High | High |
| Integrity Impact | None | None | High |
| Availability Impact | Low | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD: CVSS:3.1/AV:L/AC:H/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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