Red Hat Enterprise Linux Advanced Virtualization 8 update for the virt:av module

1) Use-after-free

EUVDB-ID: #VU58358

Risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3975

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error in the qemuMonitorUnregister() function in qemuProcessHandleMonitorEOF. An unprivileged client with a read-only connection can trigger the use-after-free error by calling the virConnectGetAllDomainStats API and crash the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux Advanced Virtualization: 8

CPE2.3

• cpe:2.3:a:red_hat:red_hat_enterprise_linux_advanced_virtualization:8:*:*:*:*:*:*:*

External links

https://access.redhat.com/errata/RHBA-2021:4684

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.