CVE-2024-26841
Description
A flaw was found in the Linux kernel. This vulnerability specifically affects LoongArch processors. The issue is related to the CPU sibling map, which is not correctly updated when non-boot CPUs are disabled. This issue could lead to errors on Symmetric Multi-Threading (SMT) systems, such as generating warnings like "jump label: negative count!" when disabling certain CPUs. The vulnerability could potentially cause system instability or kernel crashes, especially in environments that rely on SMT. The issue was resolved by defining and calling the function clear_cpu_sibling_map() to properly manage the CPU sibling map, preventing the errors. While this vulnerability doesn't appear to be remotely exploitable, it could still impact local users under specific conditions.
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 | 0 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | High | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | None | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:N
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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