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Arbitrary Code Injection Affecting kernel-rt package, versions <0:4.18.0-240.rt7.54.el8

Severity

 Recommended
0.0
medium
0
10

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.05% (22nd percentile)

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  • Snyk ID SNYK-CENTOS8-KERNELRT-2075132
  • published 26 Jul 2021
  • disclosed 12 May 2020
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Introduced: 12 May 2020

CVE-2020-12826 Open this link in a new tab
CWE-94 Open this link in a new tab

How to fix?

Upgrade Centos:8 kernel-rt to version 0:4.18.0-240.rt7.54.el8 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:8 relevant fixed versions and status.

A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.

CVSS Scores

version 3.1
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NVD

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

5.3 medium