Detections
Analytics

Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-002785)

high Nessus Plugin ID 286993

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-2026-002785 advisory.

 kernel KVM before versions kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2 and kernel 4.17-rc3 is vulnerable to a flaw in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.

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?3a60c3c5

http://www.openwall.com/lists/oss-security/2018/05/08/5

http://www.securityfocus.com/bid/104127

http://www.securitytracker.com/id/1040862

https://access.redhat.com/errata/RHSA-2018:1318

https://access.redhat.com/errata/RHSA-2018:1345

https://access.redhat.com/errata/RHSA-2018:1347

https://access.redhat.com/errata/RHSA-2018:1348

https://access.redhat.com/errata/RHSA-2018:1355

https://access.redhat.com/errata/RHSA-2018:1524

https://access.redhat.com/security/vulnerabilities/pop_ss

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1087

https://security-tracker.debian.org/tracker/CVE-2018-1087

https://usn.ubuntu.com/3641-1/

https://usn.ubuntu.com/3641-2/

https://www.debian.org/security/2018/dsa-4196

Plugin Details

Severity: High

ID: 286993

File Name: unity_linux_UTSA-2026-002785.nasl

Version: 1.2

Type: local

Published: 1/15/2026

Updated: 1/16/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2018-1087

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

Temporal Vector: CVSS:3.0/E:U/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 Ease: No known exploits are available

Patch Publication Date: 1/15/2026

Vulnerability Publication Date: 5/8/2018

Reference Information

CVE: CVE-2018-1087