Bug 2034602 (CVE-2021-4145) - CVE-2021-4145 QEMU: NULL pointer dereference in mirror_wait_on_conflicts() in block/mirror.c
Summary: CVE-2021-4145 QEMU: NULL pointer dereference in mirror_wait_on_conflicts() in...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-4145
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2001404 2002607 2034944 2035011
Blocks: 2031962 2034603
TreeView+ depends on / blocked
 
Reported: 2021-12-21 13:24 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-05-17 09:26 UTC (History)
27 users (show)

Fixed In Version: qemu-kvm 6.2.0
Doc Type: If docs needed, set a value
Doc Text:
A NULL pointer dereference issue was found in the block mirror layer of QEMU. 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.
Clone Of:
Environment:
Last Closed: 2022-05-10 18:15:36 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2022:1759 0 None None None 2022-05-10 13:17:54 UTC

Description Guilherme de Almeida Suckevicz 2021-12-21 13:24:42 UTC 
A NULL pointer dereference issue was found in QEMU in mirror_wait_on_conflicts() in block/mirror.c when creating a snapshot at some conditions.

Reference:
https://bugzilla.redhat.com/show_bug.cgi?id=2001404
Comment 1 Mauro Matteo Cascella 2021-12-22 14:04:42 UTC 
Upstream patch:
https://gitlab.com/qemu-project/qemu/-/commit/66fed30c9cd11854fc878a4eceb507e915d7c9cd
Comment 7 Mauro Matteo Cascella 2021-12-22 17:35:41 UTC 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 2035011]
Comment 11 errata-xmlrpc 2022-05-10 13:17:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1759 https://access.redhat.com/errata/RHSA-2022:1759
Comment 12 Product Security DevOps Team 2022-05-10 18:15:33 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-4145
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