CVE-2025-58142

Host crash via unmapped SIM page dereference

Published Sep 11, 2025 · Updated Sep 11, 2025

NULL pointer dereference in Xen 4.13 and later allows guest OS users to crash the host via a Viridian synthetic timer message. The Viridian timer delivery path assumes the synthetic interrupt message (SIM) page is mapped and dereferences a null pointer when it is not. Reaching the flaw requires an x86 HVM guest with the stimer Viridian extension enabled, and exploitation interrupts every guest on the host.

CVSS severity9.8
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Xen 4.13 and later allows guest OS users to crash the host via a Viridian synthetic timer message. The Viridian timer delivery path assumes the synthetic interrupt message (SIM) page is mapped and dereferences a null pointer when it is not. Reaching the flaw requires an x86 HVM guest with the stimer Viridian extension enabled, and exploitation interrupts every guest on the host.

The record

CVE
CVE-2025-58142
Published
Sep 11, 2025
Updated
Sep 11, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-395, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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-395Use of NullPointerException Catch to Detect NULL Pointer Dereference
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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