CVE-2025-58150: Shadow mode tracing code uses a set of per-CPU variables to avoid cumbersome parameter passing

Routine

HIGH 8.8MITIGATE

CVE-2025-58150 is a high-severity flaw (CVSS 8.8) affecting xen. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Shadow mode tracing code uses a set of per-CPU variables to avoid cumbersome parameter passing. Some of these variables are written to with guest controlled data, of guest controllable size. That size can be larger than the variable, and bounding of the writes was missing.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-01-28
Last modified	2026-06-17

Publisher (CNA): Xen Project · Vendor: xen

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-28 16:16 UTCPublished CVE record published
2026-06-17 09:43 UTCUpdated Record last modified

xen xen MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-58150?

xen: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-58150 being exploited?

CVE-2025-58150 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-58150 affect?

CVE-2025-58150 affects xen. Severity is high (CVSS 8.8). Shadow mode tracing code uses a set of per-CPU variables to avoid cumbersome parameter passing. Some of these variables are written to with guest controlled data, of guest controllable size. That size can be larger than the variable, and

How urgent is CVE-2025-58150?

Priority 32/100. High severity

Software pages

Xen vulnerabilities

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References

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