Home/CVE/A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in qemuProcessHandleMonitorEOF is calle
CVE

CVE-2021-3975

A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in qemuProcessHandleMonitorEOF is calle

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.

MEDIUM · CVSS 6.5 EPSS 0.00612
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-416Use After Free
CWE-416Use After Free
▤

Affected Products & Versions

8
redhat libvirt< 7.1.0
canonical ubuntu linuxall versions
fedoraproject fedoraall versions
redhat enterprise linux server for power little endian update services for sap solutionsall versions
redhat enterprise linux server tusall versions
redhat codeready linux builderall versions
debian linuxall versions
netapp ontap select deploy administration utilityall versions
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD23 Aug 2022 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

11
msrcCVE-2021-3975
usnUSN-5399-1
suse-csafSUSE-SU-2022:0045-2
rhsaRHSA-2022:1759Moderate
suse-csafSUSE-SU-2022:0128-1
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://access.redhat.com/security/cve/CVE-2021-3975Issue TrackingThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2024326Issue TrackingPatchThird Party Advisory
https://github.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18ec7PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
https://security.netapp.com/advisory/ntap-20221201-0002/Third Party Advisory
https://ubuntu.com/security/CVE-2021-3975PatchThird Party Advisory
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