CVE-2024-35929

Description

This is a vulnerability in the Linux kernel's RCU (Read-Copy Update) subsystem, specifically affecting configurations that enable lazy RCU operations (CONFIG_RCU_NOCB_CPU_DEFAULT_ALL and CONFIG_RCU_LAZY). Under certain conditions, operations like writing to /proc/sys/vm/drop_caches could trigger warnings due to unsafe handling of the RCU nocb bypass queue. This issue may result in system instability or undefined behavior. The vulnerability has been resolved by improving how the nocb bypass queue is managed to ensure safer concurrency. Users should update to a patched kernel version to prevent potential disruptions.

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 HatNVDcve.org
Base Score5.57.8N/A
Attack VectorLocalLocalN/A
Attack ComplexityLowLowN/A
Privileges RequiredLowLowN/A
User InteractionNoneNoneN/A
ScopeUnchangedUnchangedN/A
ConfidentialityNoneHighN/A
Integrity ImpactNoneHighN/A
Availability ImpactHighHighN/A

Vector

Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Red Hat CVSS v3 Score Explanation

The vulnerability lies in the Linux kernel's RCU (Read-Copy Update) subsystem, and the subsequent exploitation can result in system instability or undefined behaviour due to the warning system in such a case, anything more than denial of service is not possible and CVSS has been marked as such.

Frequently Asked Questions

Not sure what something means? Check out our Security Glossary.

Want to get errata notifications? Sign up here.