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Execution with Unnecessary Privileges Affecting kernel-rt-devel 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% (29th percentile)

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  • Snyk IDSNYK-CENTOS7-KERNELRTDEVEL-2098695
  • published26 Jul 2021
  • disclosed22 Jun 2017
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Introduced: 22 Jun 2017

CVE-2017-7518  (opens in a new tab)
CWE-250  (opens in a new tab)
First added by Snyk

How to fix?

Upgrade Centos:7 kernel-rt-devel 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-devel package and not the kernel-rt-devel 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.