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Information Exposure Affecting kernel-rt package, versions <0:3.10.0-1160.31.1.rt56.1169.el7

Severity

 Recommended
high

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.05% (19th percentile)

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  • Snyk ID SNYK-CENTOS7-KERNELRT-2186571
  • published 26 Jul 2021
  • disclosed 19 Mar 2021
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Introduced: 19 Mar 2021

CVE-2020-27170 Open this link in a new tab
CWE-200 Open this link in a new tab

How to fix?

Upgrade Centos:7 kernel-rt to version 0:3.10.0-1160.31.1.rt56.1169.el7 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-f232326f6966. This affects pointer types that do not define a ptr_limit.

References

CVSS Scores

version 3.1
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NVD

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

4.7 medium
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SUSE

4.7 medium