CVE-2021-4145

MEDIUM

QEMU < 6.2.0 - Denial of Service via NULL Pointer Dereference in Block Mirror Layer

Title source: llm
STIX 2.1

Description

A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0. The `self` pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it's not NULL. A malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host when writing data reaches the threshold of mirroring node.

References (4)

Core 4
Core References
Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=2034602
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20220311-0004/
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202208-27

Scores

CVSS v3 6.5
EPSS 0.0006
EPSS Percentile 18.0%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Details

CWE
CWE-476
Status published
Products (2)
qemu/qemu 6.1.0 (6 CPE variants)
redhat/enterprise_linux 8.0
Published Jan 25, 2022
Tracked Since Feb 18, 2026