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CVE-2024-46847

kernel: mm: vmalloc: ensure vmap_block is initialised before adding to queue

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · September 27, 2024

Updated · September 13, 2026

Description

A flaw was found in the Linux kernel's memory management (mm) component, specifically within the vmalloc subsystem. This vulnerability occurs when a new memory block (vmap_block) is added to a queue (vmap_block_queue) before a critical field (cpu) is properly initialized. A local attacker, by triggering concurrent memory operations, could exploit this uninitialized state to cause an out-of-bounds access, leading to a system crash or denial of service (DoS).

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

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.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-129 · Improper Validation of Array Index