CVE-2023-46837

Cross-guest memory disclosure via skipped cache maintenance

Published Jan 5, 2024 · Updated Nov 4, 2025

Cache maintenance failure in Xen on 32-bit Arm systems allows guest OS users to read memory previously assigned to another guest. The Arm region helpers perform overflow-prone end-address arithmetic; an overflow skips cache cleaning and invalidation before page reassignment. A malicious guest must run on a 32-bit Arm host, and the consequence is limited to disclosure of stale cross-guest memory.

CVSS severity3.3
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cache maintenance failure in Xen on 32-bit Arm systems allows guest OS users to read memory previously assigned to another guest. The Arm region helpers perform overflow-prone end-address arithmetic; an overflow skips cache cleaning and invalidation before page reassignment. A malicious guest must run on a 32-bit Arm host, and the consequence is limited to disclosure of stale cross-guest memory.

The record

CVE
CVE-2023-46837
Published
Jan 5, 2024
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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

3.3CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.3NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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 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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1005Data from Local System

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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