Detections
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Unity Linux 20.1060a Security Update: kernel (UTSA-2026-003277)
medium Nessus Plugin ID 286849
Synopsis
The Unity Linux host is missing one or more security updates.Description
The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-003277 advisory.In arch/x86/kvm/vmx.c in the Linux kernel before 4.17.2, when nested virtualization is used, local attackers could cause L1 KVM guests to VMEXIT, potentially allowing privilege escalations and denial of service attacks due to lack of checking of CPL.
Tenable has extracted the preceding description block directly from the Unity Linux security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Update the affected kernel package.See Also
http://www.nessus.org/u?cd10e92e
http://www.nessus.org/u?c861115c
https://bugs.chromium.org/p/project-zero/issues/detail?id=1589
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.17.2
http://www.nessus.org/u?25f60902
https://security-tracker.debian.org/tracker/CVE-2018-12904
https://usn.ubuntu.com/3752-1/
https://usn.ubuntu.com/3752-2/
Plugin Details
Severity: Medium
ID: 286849
File Name: unity_linux_UTSA-2026-003277.nasl
Version: 1.1
Type: local
Published: 1/15/2026
Updated: 1/15/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.2
CVSS v2
Risk Factor: Medium
Base Score: 4.4
Temporal Score: 3.4
Vector: CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P
CVSS Score Source: CVE-2018-12904
CVSS v3
Risk Factor: Medium
Base Score: 4.9
Temporal Score: 4.4
Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
Required KB Items: Host/local_checks_enabled, Host/UOS-Server/release, Host/UOS-Server/rpm-list, Host/cpu
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 1/15/2026
Vulnerability Publication Date: 6/22/2018
Reference Information
CVE: CVE-2018-12904