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CVE-2021-4145

Date: January 25, 2022

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.

Language: C

Severity Score

Related Resources (9)

https://access.redhat.com/security/cve/CVE-2021-4145
https://github.com/qemu/qemu/commit/66fed30c9cd11854fc878a4eceb507e915d7c9cd
https://bugzilla.redhat.com/show_bug.cgi?id=2034602
https://security.gentoo.org/glsa/202208-27
https://security.netapp.com/advisory/ntap-20220311-0004/
https://nvd.nist.gov/vuln/detail/CVE-2021-4145
https://security-tracker.debian.org/tracker/CVE-2021-4145
https://gitlab.com/qemu-project/qemu/-/commit/66fed30c9cd11854fc878a4eceb507e915d7c9cd
https://www.mend.io/vulnerability-database/CVE-2021-4145

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): COMPLETE
Additional information:

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