CVE-2022-42324

Service hang via truncated xenstore ring integer

Published Nov 1, 2022 · Updated Aug 3, 2024

Integer truncation in all Xen versions allows guest OS users to hang 32-bit oxenstored with a crafted xenstore-ring packet. The OCaml Xenbus library casts a ring-supplied C uint32_t directly to a 31-bit OCaml integer, producing a negative value and an unhandled exception that repeatedly fails to remove the packet. Only 32-bit OCaml oxenstored builds are affected; 64-bit oxenstored and C xenstored are not, and the resulting busy loop interrupts xenstore service.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer truncation in all Xen versions allows guest OS users to hang 32-bit oxenstored with a crafted xenstore-ring packet. The OCaml Xenbus library casts a ring-supplied C uint32_t directly to a 31-bit OCaml integer, producing a negative value and an unhandled exception that repeatedly fails to remove the packet. Only 32-bit OCaml oxenstored builds are affected; 64-bit oxenstored and C xenstored are not, and the resulting busy loop interrupts xenstore service.

The record

CVE
CVE-2022-42324
Published
Nov 1, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-681, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 1, 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?

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

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-681Incorrect Conversion between Numeric Types
T1499Endpoint Denial of Service

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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