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NULL Pointer Dereference Affecting kernel-rt-debug package, versions <0:4.18.0-80.4.2.rt9.152.el8_0

Severity

 Recommended
high

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.08% (37th percentile)

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  • Snyk ID SNYK-CENTOS8-KERNELRTDEBUG-1984355
  • published 26 Jul 2021
  • disclosed 27 Feb 2019
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Introduced: 27 Feb 2019

CVE-2019-9213 Open this link in a new tab
CWE-476 Open this link in a new tab

How to fix?

Upgrade Centos:8 kernel-rt-debug to version 0:4.18.0-80.4.2.rt9.152.el8_0 or higher.

NVD Description

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

In the Linux kernel before 4.20.14, expand_downwards in mm/mmap.c lacks a check for the mmap minimum address, which makes it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP platforms. This is related to a capability check for the wrong task.

References

CVSS Scores

version 3.1
Expand this section

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)
    None
  • Integrity (I)
    None
  • Availability (A)
    High