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


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.08% (37th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELRTMODULESEXTRA-3878269
  • published26 Jul 2021
  • disclosed27 Feb 2019

Introduced: 27 Feb 2019

CVE-2019-9213  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kernel-rt-modules-extra to version 0:4.18.0-80.4.2.rt9.152.el8_0 or higher.
This issue was patched in RHSA-2019:1480.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules-extra package and not the kernel-rt-modules-extra package as distributed by RHEL. See How to fix? for RHEL: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.

CVSS Scores

version 3.1