CVE-2025-58147Network attack vector

Guest-to-host privilege escalation via sparse vCPU mask

Published Oct 31, 2025 · Updated Nov 4, 2025

Out-of-bounds write in Xen 4.15 and newer allows guest OS users to disrupt the host or elevate privileges via a Viridian hypercall. vpmask_set() converts an HV_VP_SET Sparse vCPU bitmap into Xen's internal format without adequate bounds checking and writes beyond its destination. Only x86 HVM guests with Viridian enabled can reach the flaw; consequences include a host-wide crash, information disclosure, or guest-to-host privilege escalation.

CVSS severity7.5
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Xen 4.15 and newer allows guest OS users to disrupt the host or elevate privileges via a Viridian hypercall. vpmask_set() converts an HV_VP_SET Sparse vCPU bitmap into Xen's internal format without adequate bounds checking and writes beyond its destination. Only x86 HVM guests with Viridian enabled can reach the flaw; consequences include a host-wide crash, information disclosure, or guest-to-host privilege escalation.

The record

CVE
CVE-2025-58147
Published
Oct 31, 2025
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 31, 2025CVE 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1068Exploitation for Privilege Escalation

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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