CVE-2020-25639: Null Pointer Dereference

Published Sep 8, 2020
·
Updated

A flaw was found in the Linux kernel where an unprivileged console user can crash kernel via a nouveau ioctl.

Reference: https://lists.freedesktop.org/archives/nouveau/2020-August/036682.html

Other sources

A NULL pointer dereference flaw was found in the Linux kernel's GPU Nouveau driver functionality in versions prior to 5.12-rc1 in the way the user calls ioctl DRMIOCTLNOUVEAUCHANNELALLOC. This flaw allows a local user to crash the system.

— Launchpad

Affected Software

60 affected componentsFixes available
redhat/linux kernel<5.12
5.12
Linux Linux kernel<=5.11.2
Fedoraproject Fedora=32
Fedoraproject Fedora=33
redhat OpenShift Container Platform=4.4
redhat OpenShift Container Platform=4.5
redhat OpenShift Container Platform=4.6
redhat Enterprise Linux=5.0
redhat Enterprise Linux=6.0
redhat Enterprise Linux=7.0
redhat Enterprise Linux=8.0
redhat Messaging Realtime Grid=2.0
debian/linux
5.10.223-15.10.234-16.1.129-16.1.135-16.12.25-1
ubuntu/linux-hwe-edge*
ubuntu/linux-aws-5.4<5.4.0-1048.50~18.04.1
5.4.0-1048.50~18.04.1
ubuntu/linux-azure-5.4<5.4.0-1047.49~18.04.1
5.4.0-1047.49~18.04.1
ubuntu/linux-gcp-5.4<5.4.0-1043.46~18.04.1
5.4.0-1043.46~18.04.1
ubuntu/linux-gke-5.4<5.4.0-1043.45~18.04.1
5.4.0-1043.45~18.04.1
ubuntu/linux-gkeop-5.4<5.4.0-1015.16~18.04.1
5.4.0-1015.16~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-73.82~18.04.1
5.4.0-73.82~18.04.1
ubuntu/linux-oracle-5.4<5.4.0-1044.47~18.04.1
5.4.0-1044.47~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1035.38~18.04.1
5.4.0-1035.38~18.04.1
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-azure*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-edge*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux<5.4.0-73.82
5.4.0-73.82
ubuntu/linux-aws<5.4.0-1048.50
5.4.0-1048.50
ubuntu/linux-azure<5.4.0-1047.49
5.4.0-1047.49
ubuntu/linux-gcp<5.4.0-1043.46
5.4.0-1043.46
ubuntu/linux-gke<5.4.0-1043.45
5.4.0-1043.45
ubuntu/linux-gkeop<5.4.0-1015.16
5.4.0-1015.16
ubuntu/linux-hwe-5.8<5.8.0-53.60~20.04.1
5.8.0-53.60~20.04.1
ubuntu/linux-kvm<5.4.0-1039.40
5.4.0-1039.40
ubuntu/linux-oem-5.10<5.10.0-1021.22
5.10.0-1021.22
ubuntu/linux-oracle<5.4.0-1045.49
5.4.0-1045.49
ubuntu/linux-raspi<5.4.0-1035.38
5.4.0-1035.38
ubuntu/linux-riscv-5.8<5.8.0-25.27~20.04.1
5.8.0-25.27~20.04.1
ubuntu/linux-oem-5.6*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-aws-fips<5.4.0-1069.73+fips2
5.4.0-1069.73+fips2
ubuntu/linux-azure-fips<5.4.0-1073.76+fips1
5.4.0-1073.76+fips1
ubuntu/linux-gcp-fips<5.4.0-1067.71~20.04.1
5.4.0-1067.71~20.04.1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-raspi-realtime*
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 5.12
  2. 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 6.12.25-1
  3. Upgrade

    Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1048.50~18.04.1
  4. Upgrade

    Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1047.49~18.04.1
  5. Upgrade

    Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1043.46~18.04.1
  6. Upgrade

    Upgrade ubuntu/linux-gke-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1043.45~18.04.1
  7. Upgrade

    Upgrade ubuntu/linux-gkeop-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1015.16~18.04.1
  8. Upgrade

    Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-73.82~18.04.1
  9. Upgrade

    Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1044.47~18.04.1
  10. Upgrade

    Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1035.38~18.04.1
  11. Upgrade

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

    Fixed in 5.4.0-73.82
  12. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.4.0-1048.50
  13. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.4.0-1047.49
  14. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1043.46
  15. Upgrade

    Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.

    Fixed in 5.4.0-1043.45
  16. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 5.4.0-1015.16
  17. Upgrade

    Upgrade ubuntu/linux-hwe-5.8 to a version that resolves this vulnerability.

    Fixed in 5.8.0-53.60~20.04.1
  18. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1039.40
  19. Upgrade

    Upgrade ubuntu/linux-oem-5.10 to a version that resolves this vulnerability.

    Fixed in 5.10.0-1021.22
  20. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.4.0-1045.49
  21. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.4.0-1035.38
  22. Upgrade

    Upgrade ubuntu/linux-riscv-5.8 to a version that resolves this vulnerability.

    Fixed in 5.8.0-25.27~20.04.1
  23. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1069.73+fips2
  24. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1073.76+fips1
  25. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1067.71~20.04.1
  26. Upgrade

    Upgrade Linux kernel Nouveau driver to a version that resolves this vulnerability.

    Fixed in 5.12-rc1

Event History

Mar 4, 2021
CVE Published
via MITRE·09:56 PM
Data Sourced
via MITRE·09:56 PM
DescriptionWeakness
Data Sourced
via OSV·10:15 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·10:15 PM
DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2020-25639?

CVE-2020-25639 has a medium severity rating due to the potential for an unprivileged console user to crash the kernel.

2

How do I fix CVE-2020-25639?

To resolve CVE-2020-25639, you should upgrade your Linux kernel to version 5.12 or apply the relevant patches provided by your distribution.

3

Who is affected by CVE-2020-25639?

CVE-2020-25639 affects multiple Linux distributions, including specific versions of Red Hat Enterprise Linux and Fedora.

4

What causes the CVE-2020-25639 vulnerability?

CVE-2020-25639 is caused by a flaw in the Linux kernel's handling of a nouveau ioctl, leading to a NULL pointer dereference.

5

Is CVE-2020-25639 exploitability limited to specific users?

Yes, CVE-2020-25639 can be exploited by unprivileged console users on affected systems.

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