Vulnerability identifier: #VU64570

Vulnerability risk: Medium

CVSSv3.1: 7 [CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3929

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 NVM Express Controller emulation in QEMU within the dma_buf_write() and dma_buf_read() function in hw/nvme/ctrl.c:nvme_tx(). A remote privileged user on the guest OS can trigger a use-after-free error and execute arbitrary code on the QEMU host.

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

QEMU: 6.0.0 - 6.2.0 rc2

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External links
http://bugzilla.redhat.com/show_bug.cgi?id=2020298

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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.