CVE-2022-33744

Host denial of service via unlocked rbtree updates

Published Jul 5, 2022 · Updated Aug 3, 2024

A race condition in Linux Dom0 3.13 through 5.18 on Arm allows guest OS users to interrupt the complete Xen host via PV-device I/O. Foreign-page mapping updates modify Dom0's rbtree without holding the related lock for the full operation, allowing parallel I/O to make the tree inconsistent. Only 32-bit and 64-bit Arm hosts with unprivileged guests using PV devices are affected; x86 hosts are unaffected, and the race can crash Dom0 or block further guest-memory mappings.

CVSS severity4.7
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Linux Dom0 3.13 through 5.18 on Arm allows guest OS users to interrupt the complete Xen host via PV-device I/O. Foreign-page mapping updates modify Dom0's rbtree without holding the related lock for the full operation, allowing parallel I/O to make the tree inconsistent. Only 32-bit and 64-bit Arm hosts with unprivileged guests using PV devices are affected; x86 hosts are unaffected, and the race can crash Dom0 or block further guest-memory mappings.

The record

CVE
CVE-2022-33744
Published
Jul 5, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 5, 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

4.7NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
1.9NVDAV:L/AC:M/Au:N/C:N/I:N/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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