CVE-2022-42330

Guest-triggered Xenstore crash via XS_RELEASE handling

Published Jan 26, 2023 · Updated Aug 3, 2024

Denial of service in Xen 4.17 allows guest OS users to crash C xenstored by triggering an XS_RELEASE operation during soft reset. The C daemon crashes while processing the XS_RELEASE request that libxl emits after a guest soft reset; the vendor does not further describe the faulty state transition. The affected host must use C xenstored and a non-PV-only guest configuration, and a successful crash prevents further guest or resource administration.

CVSS severity7.5
High
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Xen 4.17 allows guest OS users to crash C xenstored by triggering an XS_RELEASE operation during soft reset. The C daemon crashes while processing the XS_RELEASE request that libxl emits after a guest soft reset; the vendor does not further describe the faulty state transition. The affected host must use C xenstored and a non-PV-only guest configuration, and a successful crash prevents further guest or resource administration.

The record

CVE
CVE-2022-42330
Published
Jan 26, 2023
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 26, 2023CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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