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Incorrect Authorization Affecting kernel-rt-kvm package, versions <0:3.10.0-1160.45.1.rt56.1185.el7

Severity

0.0
high
0
10

    Threat Intelligence

    EPSS
    0.04% (6th percentile)

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  • Snyk ID SNYK-CENTOS7-KERNELRTKVM-2187142
  • published 26 Jul 2021
  • disclosed 18 May 2021
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Introduced: 18 May 2021

CVE-2021-22543 Open this link in a new tab
CWE-863 Open this link in a new tab

How to fix?

Upgrade Centos:7 kernel-rt-kvm to version 0:3.10.0-1160.45.1.rt56.1185.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.

An issue was discovered in Linux: KVM through Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks and can lead to pages being freed while still accessible by the VMM and guest. This allows users with the ability to start and control a VM to read/write random pages of memory and can result in local privilege escalation.

References

CVSS Scores

version 3.1
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Snyk

7 high
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
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NVD

7.8 high
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SUSE

8.4 high
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Red Hat

7 high