CVE-2021-4145

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.

• CWE-476
• CWE-476

• https://bugzilla.redhat.com/show_bug.cgi?id=2034602Issue Tracking, Patch, Third Party Advisory
• https://gitlab.com/qemu-project/qemu/-/commit/66fed30c9cd11854fc878a4eceb507e915d7c9cdPatch, Third Party Advisory
• https://security.gentoo.org/glsa/202208-27Third Party Advisory
• https://security.netapp.com/advisory/ntap-20220311-0004/Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2034602Issue Tracking, Patch, Third Party Advisory
• https://gitlab.com/qemu-project/qemu/-/commit/66fed30c9cd11854fc878a4eceb507e915d7c9cdPatch, Third Party Advisory
• https://security.gentoo.org/glsa/202208-27Third Party Advisory
• https://security.netapp.com/advisory/ntap-20220311-0004/Third Party Advisory

Published

Jan 25, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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