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CVE-2021-3975

Date: August 22, 2022

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.

Language: C

Severity Score

Related Resources (10)

https://github.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18ec7
https://security-tracker.debian.org/tracker/CVE-2021-3975
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3975
https://bugzilla.redhat.com/show_bug.cgi?id=2024326
https://access.redhat.com/security/cve/CVE-2021-3975
https://security.netapp.com/advisory/ntap-20221201-0002/
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
https://nvd.nist.gov/vuln/detail/CVE-2021-3975
https://ubuntu.com/security/CVE-2021-3975
https://www.mend.io/vulnerability-database/CVE-2021-3975

Severity Score

Weakness Type (CWE)

Use After Free

CWE-416

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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