CVE-2025-58149

PCI device memory disclosure via stale BAR permissions

Published Oct 31, 2025 · Updated Nov 4, 2025

Improper permission revocation in Xen 4.0 and newer allows guest OS users to read memory from detached PCI devices. The libxl detach path leaves access permissions for 64-bit memory BARs in place after the corresponding passthrough device is removed. A PV guest with a hot-unplugged PCI passthrough device can map the stale BAR directly; an HVM guest also requires a compromised device model or stubdomain.

CVSS severity7.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper permission revocation in Xen 4.0 and newer allows guest OS users to read memory from detached PCI devices. The libxl detach path leaves access permissions for 64-bit memory BARs in place after the corresponding passthrough device is removed. A PV guest with a hot-unplugged PCI passthrough device can map the stale BAR directly; an HVM guest also requires a compromised device model or stubdomain.

The record

CVE
CVE-2025-58149
Published
Oct 31, 2025
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-672, T1005
Attack vector
local
Privileges
Unavailable

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 vectorlocal
Required privilegesUnavailable in this record.

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.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-672Operation on a Resource after Expiration or Release
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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