CVE-2021-3975 Information

Description

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.

Reference

https://access.redhat.com/security/cve/CVE-2021-3975 https://github.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18ec7 https://ubuntu.com/security/CVE-2021-3975 https://bugzilla.redhat.com/show_bug.cgi?id=2024326