CVE-2022-26354

Host process crash via stale virtqueue element

Published Mar 16, 2022 · Updated Aug 3, 2024

Improper resource release in QEMU 6.2.0 and earlier allows guest OS users to crash the host process through a malformed vhost-vsock queue element. vhost_vsock_common_send_transport_reset() frees an invalid element without first detaching it from its virtqueue, leaving the queue's resource accounting inconsistent. Exploitation requires high privileges inside a guest configured with vhost-vsock and can retain memory or terminate that guest's QEMU host process.

CVSS severity3.2
Low
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper resource release in QEMU 6.2.0 and earlier allows guest OS users to crash the host process through a malformed vhost-vsock queue element. vhost_vsock_common_send_transport_reset() frees an invalid element without first detaching it from its virtqueue, leaving the queue's resource accounting inconsistent. Exploitation requires high privileges inside a guest configured with vhost-vsock and can retain memory or terminate that guest's QEMU host process.

The record

CVE
CVE-2022-26354
Published
Mar 16, 2022
Updated
Aug 3, 2024
Vendor
QEMU Project
Product
QEMU
Classifications
CWE-772, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Affected QEMU versions <= 6.2.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

QEMU Project · QEMUversion=Affected QEMU versions <= 6.2.0

Published CVSS scores

3.2SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L
2.1NVDAV:L/AC:L/Au:N/C:N/I:N/A:P
3.2NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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