Covert Timing Channel Affecting kernel-rt-kvm package, versions *


Severity

0.0
medium
0
10

    Threat Intelligence

    EPSS
    0.04% (11th percentile)

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  • Snyk ID SNYK-CENTOS7-KERNELRTKVM-1957489
  • published 26 Jul 2021
  • disclosed 11 Feb 2016

How to fix?

There is no fixed version for Centos:7 kernel-rt-kvm.

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.

The evm_verify_hmac function in security/integrity/evm/evm_main.c in the Linux kernel before 4.5 does not properly copy data, which makes it easier for local users to forge MAC values via a timing side-channel attack.

CVSS Scores

version 3.1
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Snyk

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

5.5 medium
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Red Hat

5.5 medium