Advanced Virtualization for RHEL 8 update for the virt:8.2 and virt-devel:8.2 modules



Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-3748
CWE-ID CWE-416
Exploitation vector Local network
Public exploit N/A
Vulnerable software
 Red Hat Enterprise Linux Advanced Virtualization
Server applications / Virtualization software

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU58813

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-3748

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote guest to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when in the virtio-net device of QEMU. A malicious guest can trigger the use-after-free error and execute arbitrary code on the host system with QEMU privileges.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux Advanced Virtualization: 8

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2021:5036


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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



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