CVE-2022-4129: Race Condition

Published Aug 10, 2022
·
Updated

A flaw was found in the Linux kernel's Layer 2 Tunneling Protocol (L2TP). A missing lock when clearing skuserdata can lead to a race condition and NULL pointer dereference. A local user could use this flaw to potentially crash the system causing a denial of service.

Other sources

l2tp fails to grab the lock when modifying the underlying tunnel socket, possibly leading to a NULL pointer dereference and denial of service.

Upstream patch: https://lore.kernel.org/all/20220823101459.211986-1-jakub@cloudflare.com/t [v3] https://lore.kernel.org/all/20220815130107.149345-1-jakub@cloudflare.com/t [v2] https://lore.kernel.org/all/20220810102848.282778-1-jakub@cloudflare.com/t [v1]

— Red Hat

Affected Software

9 affected componentsFixes available
redhat/kernel-rt<0:4.18.0-477.10.1.rt7.274.el8_8
0:4.18.0-477.10.1.rt7.274.el8_8
redhat/kernel<0:4.18.0-477.10.1.el8_8
0:4.18.0-477.10.1.el8_8
redhat/kernel<0:5.14.0-284.11.1.el9_2
0:5.14.0-284.11.1.el9_2
redhat/kernel-rt<0:5.14.0-284.11.1.rt14.296.el9_2
0:5.14.0-284.11.1.rt14.296.el9_2
Linux Layer 2 Tunneling Protocol<6.0
fedoraproject fedora=35
fedoraproject fedora=36
fedoraproject fedora=37
debian/linux
5.10.223-15.10.234-16.1.129-16.1.135-16.12.25-16.12.27-1

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 0:4.18.0-477.10.1.rt7.274.el8_8
  2. Upgrade

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

    Fixed in 0:4.18.0-477.10.1.el8_8
  3. Upgrade

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

    Fixed in 0:5.14.0-284.11.1.el9_2
  4. Upgrade

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

    Fixed in 0:5.14.0-284.11.1.rt14.296.el9_2
  5. 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

Event History

Aug 10, 2022
CVE Published
12:00 AM
Oct 13, 2022
Data Sourced
via Red Hat·02:41 PM
DescriptionSeverityAffected Software
Nov 28, 2022
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
DescriptionWeakness
Data Sourced
via NVD·10:15 PM
DescriptionSeverityWeaknessAffected Software
Jan 12, 2024
Data Sourced
via Launchpad·12:11 AM
Description
Apr 28, 2025
Data Sourced
via Ubuntu·05:02 AM
RemedyDescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2022-4129?

CVE-2022-4129 is classified as a high severity vulnerability due to its potential to cause a denial of service.

2

How do I fix CVE-2022-4129?

To fix CVE-2022-4129, update the kernel to the latest version specified in the remediation details.

3

What could happen if CVE-2022-4129 is exploited?

Exploitation of CVE-2022-4129 could lead to a race condition that results in a NULL pointer dereference, potentially crashing the system.

4

Which systems are affected by CVE-2022-4129?

CVE-2022-4129 affects various versions of the Linux kernel, including specific Fedora and Red Hat kernel packages.

5

Is CVE-2022-4129 a local or remote vulnerability?

CVE-2022-4129 is a local vulnerability that requires an authenticated user to exploit.

Company

Resources

Contact

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