#VU69353 Use-after-free in QEMU - CVE-2021-3750

Vulnerability identifier: #VU69353

Vulnerability risk: High

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

CVE-ID: CVE-2021-3750

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the USB EHCI controller emulation of QEMU. A remote guest can trigger a use-after-free error and execute arbitrary code on the host OS.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

QEMU: 6.0.0 - 6.2.0

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External links
https://gitlab.com/qemu-project/qemu/-/issues/556
https://bugzilla.redhat.com/show_bug.cgi?id=1999073
https://gitlab.com/qemu-project/qemu/-/issues/541
https://security.netapp.com/advisory/ntap-20220624-0003/
https://security.gentoo.org/glsa/202208-27

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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