CVE-2021-3975: Use After Free
First published: Wed Nov 17 2021(Updated: )
A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial of service attack by causing the libvirt daemon to crash.
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/libvirt | <7.1.0 | 7.1.0 |
| debian/libvirt | 7.0.0-3+deb11u3 9.0.0-4+deb12u1 10.7.0-3 | |
| Red Hat Libvirt-daemon-driver-storage-iscsi-direct | <7.1.0 | |
| Ubuntu | =21.10 | |
| Red Hat Fedora | =35 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux Server EUS | =8.6 | |
| Red Hat Enterprise Linux for IBM Z Systems | =8.0 | |
| Red Hat Enterprise Linux for IBM Z Systems (s390x) | =8.6 | |
| Red Hat Enterprise Linux for Power, little endian | =8.0 | |
| Red Hat Enterprise Linux for Power, little endian - Extended Update Support | =8.6 | |
| Red Hat Enterprise Linux for SAP Applications for Power, little endian - Extended Update Support | =8.6 | |
| Red Hat Enterprise Linux Server | =8.6 | |
| All of | ||
| Red Hat CodeReady Linux Builder | ||
| Any of | ||
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux Server EUS | =8.6 | |
| Red Hat Enterprise Linux for IBM Z Systems | =8.0 | |
| Red Hat Enterprise Linux for IBM Z Systems (s390x) | =8.6 | |
| Red Hat Enterprise Linux for Power, little endian | =8.0 | |
| Red Hat Enterprise Linux for Power, little endian - Extended Update Support | =8.6 | |
| Debian Linux | =10.0 | |
| Debian Linux | =11.0 | |
| NetApp ONTAP Select Deploy | ||
| Red Hat CodeReady Linux Builder | ||
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux Server EUS | =8.6 | |
| Red Hat Enterprise Linux for IBM Z Systems | =8.0 | |
| Red Hat Enterprise Linux for IBM Z Systems (s390x) | =8.6 | |
| Red Hat Enterprise Linux for Power, little endian | =8.0 | |
| Red Hat Enterprise Linux for Power, little endian - Extended Update Support | =8.6 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2021-3975
- https://bugzilla.redhat.com/show_bug.cgi?id=2024326
- https://github.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18ec7
- https://security.netapp.com/advisory/ntap-20221201-0002/
- https://ubuntu.com/security/CVE-2021-3975
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2024334
- https://access.redhat.com/errata/RHSA-2022:1759
- https://access.redhat.com/security/cve/cve-2021-3975
- https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
- https://launchpad.net/bugs/cve/CVE-2021-3975
- https://security-tracker.debian.org/tracker/CVE-2021-3975
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3975
- https://nvd.nist.gov/vuln/detail/CVE-2021-3975
Frequently Asked Questions
What is CVE-2021-3975?
CVE-2021-3975 is a use-after-free vulnerability found in libvirt.
What is the severity of CVE-2021-3975?
The severity of CVE-2021-3975 is medium with a CVSS score of 6.5.
How does CVE-2021-3975 affect libvirt?
CVE-2021-3975 affects libvirt by allowing an attacker to trigger a use-after-free flaw, potentially leading to arbitrary code execution or a denial of service.
How can I fix CVE-2021-3975?
To fix CVE-2021-3975, update libvirt to version 7.1.0 or later.
Where can I find more information about CVE-2021-3975?
You can find more information about CVE-2021-3975 on the Red Hat Security Advisory and the GitHub commit linked in the references.
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