CVE-2023-46836

Cross-guest memory disclosure via IRQ-safety race

Published Jan 5, 2024 · Updated Nov 4, 2025

Information disclosure in Xen on x86 systems allows guest OS users to infer memory contents belonging to other guests. The XPTI entry paths leave interrupts enabled while the BTC/SRSO fixes assume IRQs are disabled, creating a race that bypasses those mitigations. Only PV guests can trigger the race; default configurations are vulnerable only on AMD and Hygon CPUs, and the consequence is cross-guest memory inference.

CVSS severity4.7
Medium
EPSS probability0.25%
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 Xen on x86 systems allows guest OS users to infer memory contents belonging to other guests. The XPTI entry paths leave interrupts enabled while the BTC/SRSO fixes assume IRQs are disabled, creating a race that bypasses those mitigations. Only PV guests can trigger the race; default configurations are vulnerable only on AMD and Hygon CPUs, and the consequence is cross-guest memory inference.

The record

CVE
CVE-2023-46836
Published
Jan 5, 2024
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
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

4.7CISACVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/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 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

No sourced classifications are available.

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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