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Execution with Unnecessary Privileges Affecting kernel-debug package, versions <0:3.10.0-693.21.1.el7

Severity

 Recommended
high

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    0.06% (28th percentile)

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  • Snyk ID SNYK-RHEL7-KERNELDEBUG-4770162
  • 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 RHEL:7 kernel-debug to version 0:3.10.0-693.21.1.el7 or higher.
This issue was patched in RHSA-2018:0395.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debug package and not the kernel-debug package as distributed by RHEL. See How to fix? for RHEL: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.