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Incorrect Authorization Affecting kernel-rt-core package, versions <0:4.18.0-348.rt7.130.el8

Severity

 Recommended
0.0
medium
0
10

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.05% (21st percentile)

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  • Snyk ID SNYK-CENTOS8-KERNELRTCORE-2129136
  • published 26 Jul 2021
  • disclosed 18 Apr 2021
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Introduced: 18 Apr 2021

CVE-2021-29155 Open this link in a new tab
CWE-863 Open this link in a new tab
CWE-125 Open this link in a new tab

How to fix?

Upgrade Centos:8 kernel-rt-core to version 0:4.18.0-348.rt7.130.el8 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-core package and not the kernel-rt-core package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

An issue was discovered in the Linux kernel through 5.11.x. 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. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations.

References

CVSS Scores

version 3.1
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NVD

5.5 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • 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

4.4 medium
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SUSE

6.2 medium