Use After Free Affecting qemu package, versions *


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.09% (40th percentile)

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  • Snyk IDSNYK-UBUNTU1604-QEMU-2326054
  • published25 Dec 2021
  • disclosed25 Aug 2022

Introduced: 25 Dec 2021

CVE-2021-3929  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

There is no fixed version for Ubuntu:16.04 qemu.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu package and not the qemu package as distributed by Ubuntu. See How to fix? for Ubuntu:16.04 relevant fixed versions and status.

A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU. This CVE is similar to CVE-2021-3750 and, just like it, when the reentrancy write triggers the reset function nvme_ctrl_reset(), data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition or, potentially, executing arbitrary code within the context of the QEMU process on the host.

CVSS Scores

version 3.1