CVE-2021-3975

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.

CVSS v3.1

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

1.53% chance of exploitation in the next 30 days, 73th percentile

Published

2022-08-23

Updated

2024-08-03

Proof-of-concept exploits (1)

• yan5ui/ENV-CVE-2021-3975

References

• CVE Record
• NVD entry

Related

• CVE-2020-8036
• CVE-2021-39749
• CVE-2021-3976
• CVE-2021-3974
• CVE-2021-3977
• CVE-2021-3973