CVE-2023-46841

Host crash via shadow-stack recovery mismatch

Published Mar 20, 2024 · Updated Nov 4, 2025

Denial of service in Xen 4.14 and later allows guest OS users to crash an entire x86 host through emulation-stub exceptions. Exception recovery removes the emulation-stub call frame from the traditional stack but leaves its shadow-stack counterpart in place, causing a control-flow mismatch. Exploitation requires an HVM or PVH guest on an x86 host with CET shadow stacks enabled; PV guests, Arm hosts, and x86 hosts without CET-SS are unaffected.

CVSS severityUnavailable
Unscored
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Xen 4.14 and later allows guest OS users to crash an entire x86 host through emulation-stub exceptions. Exception recovery removes the emulation-stub call frame from the traditional stack but leaves its shadow-stack counterpart in place, causing a control-flow mismatch. Exploitation requires an HVM or PVH guest on an x86 host with CET shadow stacks enabled; PV guests, Arm hosts, and x86 hosts without CET-SS are unaffected.

The record

CVE
CVE-2023-46841
Published
Mar 20, 2024
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 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

No CVSS assessment is available in this record.

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

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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