The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:2396 advisory.

    The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with     extremely high determinism requirements.

    Security Fix(es):

    * Modern operating systems implement virtualization of physical memory to efficiently use available system     resources and provide inter-domain protection through access control and isolation. The L1TF issue was     found in the way the x86 microprocessor designs have implemented speculative execution of instructions (a     commonly used performance optimisation) in combination with handling of page-faults caused by terminated     virtual to physical address resolving process. As a result, an unprivileged attacker could use this flaw     to read privileged memory of the kernel or other processes and/or cross guest/host boundaries to read host     memory by conducting targeted cache side-channel attacks. (CVE-2018-3620, CVE-2018-3646)

    * An industry-wide issue was found in the way many modern microprocessor designs have implemented     speculative execution of Load & Store instructions (a commonly used performance optimization). It relies     on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact     that memory read from address to which a recent memory write has occurred may see an older value and     subsequently cause an update into the microprocessor's data cache even for speculatively executed     instructions that never actually commit (retire). As a result, an unprivileged attacker could use this     flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639)

    Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting CVE-2018-3620 and CVE-2018-3646 and Ken     Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting     CVE-2018-3639.

    Bug Fix(es):

    * The kernel-rt packages have been upgraded to the 3.10.0-693.37.1 source tree, which provides a number of     bug fixes over the previous version. (BZ#1599860)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

Analytics

RHEL 6 : kernel-rt (RHSA-2018:2396)

medium Nessus Plugin ID 111775

Version 1.14

Version 1.13

Version 1.12

Version 1.11

Version 1.14 Mar 26, 2025, 6:39 PM CVSS metrics ("CVSSv3 score" set to 5.6) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N") CVSSv3 score source (changed from "manual" to none) Plugin Feed: 202503261839
Version 1.13 Feb 18, 2025, 11:54 PM Plugin metadata (CVSS 3 Change AC:H --> AC:L where needed) Plugin Feed: 202502182354
Version 1.12 Nov 5, 2024, 12:50 PM CVSS metrics ("Cvssv4 score" set to 0.0) CVSSv2 severity (based on None, severity decreased from "High" to "Low") Detection (updated detection logic) Plugin metadata Reference Plugin Feed: 202411051250
Version 1.11 Aug 21, 2024, 9:55 AM CVSSv2 score source (set to "CVE-2018-3646") Plugin Feed: 202408210955