CVE-2025-27466CWE-395

CVE-2025-27466

Critical · published September 11, 2025

CVSS v3.1
9.8
EPSS
0%
Percentile
40.7
In the wild
Unconfirmed
What it is

🚨 A NULL pointer dereference could leave your virtual machine vulnerable! This CVE, CVE-2025-27466, is all about mishandling guest memory pages that can lead to unexpected crashes! 🔥 Think of it like a hotel booking system that crashes when you try to check in without an actual reservation — if the system can't find your info, everything goes haywire. This CVE disrupts the ability of the hypervisor to manage guest memory correctly, leading to potential chaos in virtual environments. If exploited, an attacker could trigger a crash in your virtual machine, rendering important services unavailable. This is especially devastating for any businesses relying on uptime, as it could lead to data loss, interrupted services, and even compromise the entire virtualized environment.

Put simply

Think of it like a hotel booking system that crashes when you try to check in without an actual reservation — if the system can't find your info, everything goes haywire. This CVE disrupts the ability of the hypervisor to manage guest memory correctly, leading to potential chaos in virtual environments. This vulnerability arises from the hypervisor's failure to handle NULL pointers correctly when updating reference TSC areas, making it possible for malicious actions to disrupt the memory management of the guest system.

What to do

If exploited, an attacker could trigger a crash in your virtual machine, rendering important services unavailable. This is especially devastating for any businesses relying on uptime, as it could lead to data loss, interrupted services, and even compromise the entire virtualized environment. To mitigate this issue, ensure that your system is patched to the latest version as per vendor recommendations. Regularly update your hypervisor software and monitor for any security advisories regarding memory management vulnerabilities. You've got this! Stay vigilant, apply those updates, and you'll keep your virtual environment secure! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00484 · 40.7th percentile
Weakness
CWE-395 · Use of NullPointerException Catch to Detect NULL Pointer Dereference
Published
2025-09-11T18:15Z
Affected products (1)
ProductVersionsFixed in
xen/xen≥ 4.13.0, < 4.17.04.17.0
References (3)
EPSS history
Timeline
  • 11 SEP 14:05Z
    Mutiple vulnerabilities in the Viridian interface
    cvelistv5