How severe is CVE-2025-58149?

CVE-2025-58149 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-58149 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-58149?

CVE-2025-58149 affects Xen. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-58149?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-58149 have an EU (EUVD) identifier?

Yes. CVE-2025-58149 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37346.

When was CVE-2025-58149 published?

CVE-2025-58149 was published on 2025-10-31 and last updated on 2026-06-17.

CVE-2025-58149

CVE-2025-58149 is a high-severity vulnerability in Xen with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-672.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-37346
Weakness: CWE-672
Affected product: Xen
Published: 2025-10-31
Last modified: 2026-06-17

Description

When passing through PCI devices, the detach logic in libxl won't remove access permissions to any 64bit memory BARs the device might have. As a result a domain can still have access any 64bit memory BAR when such device is no longer assigned to the domain. For PV domains the permission leak allows the domain itself to map the memory in the page-tables. For HVM it would require a compromised device model or stubdomain to map the leaked memory into the HVM domain p2m.

Frequently asked questions

What is CVE-2025-58149?: When passing through PCI devices, the detach logic in libxl won't remove access permissions to any 64bit memory BARs the device might have. As a result a domain can still have access any 64bit memory BAR when such device is no longer assigned to the domain. For PV domains the permission leak allows the domain itself to map the memory in the page-tables. For HVM it would require a compromised device model or stubdomain to map the leaked memory into the HVM domain p2m.
How severe is CVE-2025-58149?: CVE-2025-58149 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-58149 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-58149?: CVE-2025-58149 affects Xen. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-58149?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-58149 have an EU (EUVD) identifier?: Yes. CVE-2025-58149 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37346.
When was CVE-2025-58149 published?: CVE-2025-58149 was published on 2025-10-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*

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