CVE-2022-33741

Guest memory disclosure via grant-page over-sharing

Published Jul 5, 2022 · Updated Aug 3, 2024

Information disclosure in Linux Xen PV frontends allows guest OS users controlling a backend to read unrelated guest memory. Grant-table page granularity shares an entire 4 KiB page, exposing unrelated data adjacent to the intended shared region. Exposure requires a Linux guest using PV devices and a potentially malicious backend; writable mappings can also crash contiguous-data consumers.

CVSS severity7.1
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux Xen PV frontends allows guest OS users controlling a backend to read unrelated guest memory. Grant-table page granularity shares an entire 4 KiB page, exposing unrelated data adjacent to the intended shared region. Exposure requires a Linux guest using PV devices and a potentially malicious backend; writable mappings can also crash contiguous-data consumers.

The record

CVE
CVE-2022-33741
Published
Jul 5, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-200
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

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.6NIST NVDAV:L/AC:L/Au:N/C:P/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

CWE-200Exposure of Sensitive Information to an Unauthorized Actor

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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