CVE-2021-45868

kernel: fs/quota/quota_tree.c does not validate the block number in the quota tree

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Severity

Moderate

Red Hat Product Security

5.1

CVSS 3.1

Review impact separately from score.

Published · March 18, 2022

Updated · November 22, 2025

Description

A use-after-free vulnerability was found in the Linux kernel. The quota mechanism doesn't properly validate the quota block number, triggering a use-after-free bug in the RWSem code, leading to a denial of service.

Statement

The latest kernel version distributed with Red Hat Enterprise Linux 8 is not affected by this issue as it already contains the patch which prevents this issue to happen.

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

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.1
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-416 · Use After Free