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

Severity

 Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.09% (27th percentile)

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  • Snyk IDSNYK-RHEL7-KERNEL-4751307
  • published26 Jul 2021
  • disclosed22 Jun 2017
Report a new vulnerability Found a mistake?

Introduced: 22 Jun 2017

CVE-2017-7518  (opens in a new tab)
CWE-250  (opens in a new tab)

How to fix?

Upgrade RHEL:7 kernel 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 package and not the kernel 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.