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Citrix XenServer 8.4.x Page Reference Leak (CTX697170)

medium Nessus Plugin ID 370481

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Synopsis

A server virtualization platform installed on the remote host is affected by a page reference leak vulnerability.

Description

The version of Citrix XenServer installed on the remote host is 8.4.x. It is, therefore, affected by a vulnerability as referenced in the CTX697170 advisory:

 - The grant table cache-flush error path fails to drop a page reference, which may allow a privileged user in a guest VM to compromise or crash the host. (CVE-2026-102700)

According to the advisory, this issue affects XenServer 8.4 only.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number. The vendor delivers this update through the XenServer update channels without changing the reported product version, so Nessus cannot determine whether the update has been applied.

Solution

Apply the latest updates from the Early Access or Normal update channel of XenServer 8.4 as described in the vendor advisory.

See Also

https://xenbits.xenproject.org/xsa/advisory-520.html

http://www.nessus.org/u?1e3ee795

Plugin Details

Severity: Medium

ID: 370481

File Name: citrix_xenserver_CTX697170_CVE-2026-102700.nasl

Version: 1.2

Type: Local

Family: Misc.

Published: 10/22/2026

Updated: 10/23/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

Percentile: 95.76

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 2.8

Vector: CVSS2#AV:L/AC:H/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2026-102700

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:citrix:xenserver

Required KB Items: Host/local_checks_enabled, Settings/ParanoidReport, Host/XenServer/version

Exploit Ease: No known exploits are available

Patch Publication Date: 10/13/2026

Vulnerability Publication Date: 10/13/2026

Reference Information

CVE: CVE-2026-102700

CWE: 404