CVE-2020-29368: Race Condition

Published Jun 3, 2020
·
Updated

An issue was discovered in splithugepmd in mm/hugememory.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.

Other sources

An issue was discovered in splithugepmd in mm/hugememory.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.

Reference: https://bugs.chromium.org/p/project-zero/issues/detail?id=2045

Upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c444eb564fb16645c172d550359cb3d75fe8a040

— Red Hat

An issue was discovered in splithugepmd in mm/hugememory.c in the Linux kernel. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check.

In splithugepmd of hugememory.c, there is a possible incorrectly mapped page due to a race condition. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

— OSV

Affected Software

27 affected componentsFixes available
redhat/kernel-rt<0:4.18.0-348.rt7.130.el8
0:4.18.0-348.rt7.130.el8
redhat/kernel<0:4.18.0-348.el8
0:4.18.0-348.el8
redhat/kernel-rt<0:4.18.0-193.87.1.rt13.137.el8_2
0:4.18.0-193.87.1.rt13.137.el8_2
redhat/kernel<0:4.18.0-193.87.1.el8_2
0:4.18.0-193.87.1.el8_2
redhat/kernel-rt<0:4.18.0-305.57.1.rt7.129.el8_4
0:4.18.0-305.57.1.rt7.129.el8_4
redhat/kernel<0:4.18.0-305.57.1.el8_4
0:4.18.0-305.57.1.el8_4
Linux Linux kernel<5.7.5
NetApp Cloud Backup
NetApp Element Software
NetApp Hci Management Node
NetApp Solidfire
NetApp Hci Bootstrap Os
NetApp Hci Compute Node
NetApp H410c Firmware
NetApp H410c
Linux Linux kernel>=4.5.5<4.9.228
Linux Linux kernel>=4.10<4.14.185
Linux Linux kernel>=4.15<4.19.129
Linux Linux kernel>=4.20<5.4.48
Linux Linux kernel>=5.5<5.7.5
All of the following
NetApp Hci Bootstrap Os
NetApp Hci Compute Node
All of the following
NetApp H410c Firmware
NetApp H410c
debian/linux
5.10.223-15.10.234-16.1.129-16.1.135-16.12.25-16.12.27-1
Google Android
android/:linux_kernel:>=:0<:2022-03-05
:2022-03-05

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-348.rt7.130.el8
  2. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-348.el8
  3. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-193.87.1.rt13.137.el8_2
  4. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-193.87.1.el8_2
  5. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-305.57.1.rt7.129.el8_4
  6. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-305.57.1.el8_4
  7. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 5.10.223-1Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.25-1Fixed in 6.12.27-1
  8. Upgrade

    Upgrade android/:linux_kernel: to a version that resolves this vulnerability.

    Fixed in :2022-03-05
  9. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Fixed in 5.7.5Patch c444eb564fb16645c172d550359cb3d75fe8a040

Event History

Jun 3, 2020
CVE Published
12:00 AM
Nov 28, 2020
CVE Published
via MITRE·06:20 AM
Data Sourced
via MITRE·06:20 AM
Description
Dec 1, 2020
Data Sourced
via Red Hat·05:09 PM
DescriptionSeverityAffected Software
Mar 1, 2022
Advisory Published
via OSV·12:00 AM
Data Sourced
via OSV·12:00 AM
DescriptionAffected Software
Mar 7, 2022
Data Sourced
via Android·12:00 AM
SeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2020-29368?

CVE-2020-29368 has a medium severity rating due to the potential for unintended write access caused by a race condition.

2

How do I fix CVE-2020-29368?

To fix CVE-2020-29368, upgrade to the kernel versions 4.18.0-348.el8 or newer, or apply the recommended patches.

3

What systems are affected by CVE-2020-29368?

CVE-2020-29368 affects various versions of the Linux kernel prior to 5.7.5, including specific Red Hat and Debian releases.

4

Is CVE-2020-29368 exploitable remotely?

CVE-2020-29368 is not inherently exploitable remotely as it requires local access to the affected system for exploitation.

5

What components are involved in CVE-2020-29368?

CVE-2020-29368 is associated with the copy-on-write mechanism in the Linux kernel's memory management, specifically in the huge memory handling functions.

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