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Execution with Unnecessary Privileges Affecting kernel-rt-kvm package, versions <0:3.10.0-693.21.1.rt56.639.el7

Severity

 Recommended
high

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.06% (27th percentile)

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  • Snyk ID SNYK-CENTOS7-KERNELRTKVM-2099040
  • published 26 Jul 2021
  • disclosed 22 Jun 2017
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Introduced: 22 Jun 2017

CVE-2017-7518 Open this link in a new tab
CWE-250 Open this link in a new tab

How to fix?

Upgrade Centos:7 kernel-rt-kvm to version 0:3.10.0-693.21.1.rt56.639.el7 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. Linux guests are not affected by this.