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Use After Free The advisory has been revoked - it doesn't affect any version of package qemu-guest-agent  (opens in a new tab)

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EPSS
0.53% (43rd percentile)

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  • Snyk IDSNYK-RHEL9-QEMUGUESTAGENT-9459651
  • published16 Mar 2025
  • disclosed26 Aug 2020
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Introduced: 26 Aug 2020

CVE-2021-3750  (opens in a new tab)
CWE-416  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu-guest-agent package and not the qemu-guest-agent package as distributed by RHEL.

A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU. EHCI does not verify if the Buffer Pointer overlaps with its MMIO region when it transfers the USB packets. Crafted content may be written to the controller's registers and trigger undesirable actions (such as reset) while the device is still transferring packets. This can ultimately lead 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 execute arbitrary code within the context of the QEMU process on the host. This flaw affects QEMU versions before 7.0.0.