CVE-2021-4145

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

Link	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=2034602	issue tracking third party advisory patch
https://gitlab.com/qemu-project/qemu/-/commit/66fed30c9cd11854fc878a4eceb507e915d7c9cd	third party advisory patch
https://security.netapp.com/advisory/ntap-20220311-0004/	third party advisory
https://security.gentoo.org/glsa/202208-27	third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-4145?: CVE-2021-4145 has been scored as a medium severity vulnerability.
How to fix CVE-2021-4145?: To fix CVE-2021-4145, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-4145 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-4145 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-4145?: CVE-2021-4145 affects n/a QEMU.

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Description

Category

CWE-476 – NULL Pointer Dereference

References

Frequently Asked Questions