Race Condition Affecting kernel-rt-modules package, versions <0:4.18.0-348.rt7.130.el8


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.08% (36th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELRTMODULES-1348506
  • published26 Jul 2021
  • disclosed3 Jun 2020

Introduced: 3 Jun 2020

CVE-2020-29368  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kernel-rt-modules to version 0:4.18.0-348.rt7.130.el8 or higher.
This issue was patched in RHSA-2021:4140.

NVD Description

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

An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.

CVSS Scores

version 3.1