CVE-2022-23040

Guest-memory read and write via unchecked grant revocation

Published Mar 10, 2022 · Updated Aug 3, 2024

Race condition in Linux xenbus PV frontends allows attackers controlling a PV backend to read or write guest memory through retained grant access. The xenbus driver fails to check whether revoking a shared ring-buffer grant succeeded, allowing the backend to retain access to the page. Exposure requires a Linux guest using PV devices with a potentially malicious backend; retained access crosses the guest boundary.

CVSS severity7.0
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux xenbus PV frontends allows attackers controlling a PV backend to read or write guest memory through retained grant access. The xenbus driver fails to check whether revoking a shared ring-buffer grant succeeded, allowing the backend to retain access to the page. Exposure requires a Linux guest using PV devices with a potentially malicious backend; retained access crosses the guest boundary.

The record

CVE
CVE-2022-23040
Published
Mar 10, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 10, 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

4.4NIST NVDAV:L/AC:M/Au:N/C:P/I:P/A:P
7.0NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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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