#VU53679 Memory leak in QEMU - CVE-2021-3544

Vulnerability identifier: #VU53679

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3544

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description
The vulnerability allows a remote user to perform DoS attack on the target system.

The vulnerability exists due to multiple memory leaks in the vhost-user-gpu/vhost-user-gpu.c. A remote authenticated user of the guest operating system can force the application to leak memory and perform denial of service attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

QEMU: 5.0.0 - 6.0.0

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External links
https://seclists.org/oss-sec/2021/q2/176
https://gitlab.com/qemu-project/qemu/-/commit/86dd8fac
https://gitlab.com/qemu-project/qemu/-/commit/b9f79858
https://gitlab.com/qemu-project/qemu/-/commit/b7afebcf
https://gitlab.com/qemu-project/qemu/-/commit/f6091d86
https://gitlab.com/qemu-project/qemu/-/commit/63736af5

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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