CVE-2021-3975

moderate-risk
Published 2022-08-23

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.

Do I need to act?

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0.52% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (15)

Affected Vendors

Debian Redhat Canonical Fedoraproject Netapp

References (12)

Issue Tracking https://access.redhat.com/security/cve/CVE-2021-3975
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2024326
Patch https://github.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18e...
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
Third Party Advisory https://security.netapp.com/advisory/ntap-20221201-0002/
Patch https://ubuntu.com/security/CVE-2021-3975
Issue Tracking https://access.redhat.com/security/cve/CVE-2021-3975
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2024326
Patch https://github.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18e...
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
Third Party Advisory https://security.netapp.com/advisory/ntap-20221201-0002/
Patch https://ubuntu.com/security/CVE-2021-3975
44
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 2/34 · Minimal
Exposure 18/34 · Moderate