CVE-2020-27820: Use After Free

Published Nov 3, 2020
·
Updated

A vulnerability was found in kernel, where a use-after-frees in nouveau's postclose() handler could happen if removing device (that is not common to remove video card physically without power-off, but same happens if "unbind" the driver).

Other sources

A vulnerability was found in Linux kernel, where a use-after-frees in nouveau's postclose() handler could happen if removing device (that is not common to remove video card physically without power-off, but same happens if "unbind" the driver).

Affected Software

117 affected componentsFixes available
redhat/kernel-rt<0:4.18.0-372.9.1.rt7.166.el8
0:4.18.0-372.9.1.rt7.166.el8
redhat/kernel<0:4.18.0-372.9.1.el8
0:4.18.0-372.9.1.el8
Linux Linux kernel>2.6.12<5.4.162
Linux Linux kernel>5.5<5.10.82
Linux Linux kernel>5.11<5.15.5
Linux Linux kernel=2.6.12
Linux Linux kernel=2.6.12-rc2
Linux Linux kernel=2.6.12-rc3
Linux Linux kernel=2.6.12-rc4
Linux Linux kernel=2.6.12-rc5
Linux Linux kernel=2.6.12-rc6
Fedoraproject Fedora=33
Oracle Communications Cloud Native Core Binding Support Function=22.1.3
Oracle Communications Cloud Native Core Network Exposure Function=22.1.1
Oracle Communications Cloud Native Core Policy=22.2.0
Linux Linux kernel
debian/linux
5.10.223-15.10.234-16.1.129-16.1.135-16.12.25-16.12.27-1
ubuntu/linux-aws<4.4.0-1104.109
4.4.0-1104.109
ubuntu/linux-lts-xenial<4.4.0-224.257~14.04.1
4.4.0-224.257~14.04.1
ubuntu/linux*
ubuntu/linux-azure*
ubuntu/linux<4.4.0-224.257
4.4.0-224.257
ubuntu/linux-aws<4.4.0-1140.154
4.4.0-1140.154
ubuntu/linux-kvm<4.4.0-1105.114
4.4.0-1105.114
ubuntu/linux-aws-hwe*
ubuntu/linux-azure*
ubuntu/linux-gcp*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-oracle*
ubuntu/linux-fips<4.4.0-1074.80
4.4.0-1074.80
ubuntu/linux-fips*
ubuntu/linux-aws-5.4<5.4.0-1075.80~18.04.1
5.4.0-1075.80~18.04.1
ubuntu/linux-azure-5.4<5.4.0-1078.81~18.04.1
5.4.0-1078.81~18.04.1
ubuntu/linux-gcp-5.4<5.4.0-1073.78~18.04.1
5.4.0-1073.78~18.04.1
ubuntu/linux-gke-5.4<5.4.0-1071.76~18.04.3
5.4.0-1071.76~18.04.3
ubuntu/linux-gkeop-5.4<5.4.0-1040.41~18.04.1
5.4.0-1040.41~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-110.124~18.04.1
5.4.0-110.124~18.04.1
ubuntu/linux-ibm-5.4<5.4.0-1021.23~18.04.1
5.4.0-1021.23~18.04.1
ubuntu/linux-oracle-5.4<5.4.0-1071.77~18.04.1
5.4.0-1071.77~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1060.68~18.04.1
5.4.0-1060.68~18.04.1
ubuntu/linux*
ubuntu/linux-aws*
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-azure*
ubuntu/linux-azure-4.15*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-4.15*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-edge*
ubuntu/linux-gke-4.15*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-kvm*
ubuntu/linux-oem*
ubuntu/linux-oracle*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-110.124
5.4.0-110.124
ubuntu/linux-aws<5.4.0-1073.78
5.4.0-1073.78
ubuntu/linux-aws-5.11<5.11.0-1028.31~20.04.1
5.11.0-1028.31~20.04.1
ubuntu/linux-aws-5.13<5.13.0-1012.13~20.04.1
5.13.0-1012.13~20.04.1
ubuntu/linux-azure<5.4.0-1078.81
5.4.0-1078.81
ubuntu/linux-azure-5.11<5.11.0-1028.31~20.04.2
5.11.0-1028.31~20.04.2
ubuntu/linux-azure-5.13<5.13.0-1013.15~20.04.1
5.13.0-1013.15~20.04.1
ubuntu/linux-bluefield<5.4.0-1040.44
5.4.0-1040.44
ubuntu/linux-gcp<5.4.0-1073.78
5.4.0-1073.78
ubuntu/linux-gcp-5.11<5.11.0-1029.33~20.04.3
5.11.0-1029.33~20.04.3
ubuntu/linux-gcp-5.13<5.13.0-1013.16~20.04.1
5.13.0-1013.16~20.04.1
ubuntu/linux-gke<5.4.0-1071.76
5.4.0-1071.76
ubuntu/linux-gkeop<5.4.0-1040.41
5.4.0-1040.41
ubuntu/linux-hwe-5.13<5.13.0-28.31~20.04.1
5.13.0-28.31~20.04.1
ubuntu/linux-ibm<5.4.0-1021.23
5.4.0-1021.23
ubuntu/linux-iot<5.4.0-1004.6
5.4.0-1004.6
ubuntu/linux-kvm<5.4.0-1063.66
5.4.0-1063.66
ubuntu/linux-oem-5.10<5.10.0-1053.55
5.10.0-1053.55
ubuntu/linux-oem-5.13<5.13.0-1029.36
5.13.0-1029.36
ubuntu/linux-oem-5.14<5.14.0-1022.24
5.14.0-1022.24
ubuntu/linux-oracle<5.4.0-1071.77
5.4.0-1071.77
ubuntu/linux-oracle-5.11<5.11.0-1028.31~20.04.1
5.11.0-1028.31~20.04.1
ubuntu/linux-oracle-5.13<5.13.0-1016.20~20.04.1
5.13.0-1016.20~20.04.1
ubuntu/linux-raspi<5.4.0-1060.68
5.4.0-1060.68
ubuntu/linux-aws-5.8*
ubuntu/linux-azure-5.8*
ubuntu/linux-azure-fde-5.15<5.15.0-1114.123~20.04.1
5.15.0-1114.123~20.04.1
ubuntu/linux-gcp-5.8*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.8*
ubuntu/linux-intel-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.8*
ubuntu/linux-aws-fips<5.4.0-1073.78+fips1
5.4.0-1073.78+fips1
ubuntu/linux-azure-fips<5.4.0-1078.81+fips1
5.4.0-1078.81+fips1
ubuntu/linux-fips<5.4.0-1049.55
5.4.0-1049.55
ubuntu/linux-gcp-fips<5.4.0-1073.78+fips1
5.4.0-1073.78+fips1
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*

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 0:4.18.0-372.9.1.rt7.166.el8
  2. Upgrade

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

    Fixed in 0:4.18.0-372.9.1.el8
  3. 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
  4. Upgrade

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

    Fixed in 4.4.0-1104.109
  5. Upgrade

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

    Fixed in 4.4.0-224.257~14.04.1
  6. Upgrade

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

    Fixed in 4.4.0-224.257
  7. Upgrade

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

    Fixed in 4.4.0-1140.154
  8. Upgrade

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

    Fixed in 4.4.0-1105.114
  9. Upgrade

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

    Fixed in 4.4.0-1074.80
  10. Upgrade

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

    Fixed in 5.4.0-1075.80~18.04.1
  11. Upgrade

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

    Fixed in 5.4.0-1078.81~18.04.1
  12. Upgrade

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

    Fixed in 5.4.0-1073.78~18.04.1
  13. Upgrade

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

    Fixed in 5.4.0-1071.76~18.04.3
  14. Upgrade

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

    Fixed in 5.4.0-1040.41~18.04.1
  15. Upgrade

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

    Fixed in 5.4.0-110.124~18.04.1
  16. Upgrade

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

    Fixed in 5.4.0-1021.23~18.04.1
  17. Upgrade

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

    Fixed in 5.4.0-1071.77~18.04.1
  18. Upgrade

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

    Fixed in 5.4.0-1060.68~18.04.1
  19. Upgrade

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

    Fixed in 5.4.0-110.124
  20. Upgrade

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

    Fixed in 5.4.0-1073.78
  21. Upgrade

    Upgrade ubuntu/linux-aws-5.11 to a version that resolves this vulnerability.

    Fixed in 5.11.0-1028.31~20.04.1
  22. Upgrade

    Upgrade ubuntu/linux-aws-5.13 to a version that resolves this vulnerability.

    Fixed in 5.13.0-1012.13~20.04.1
  23. Upgrade

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

    Fixed in 5.4.0-1078.81
  24. Upgrade

    Upgrade ubuntu/linux-azure-5.11 to a version that resolves this vulnerability.

    Fixed in 5.11.0-1028.31~20.04.2
  25. Upgrade

    Upgrade ubuntu/linux-azure-5.13 to a version that resolves this vulnerability.

    Fixed in 5.13.0-1013.15~20.04.1
  26. Upgrade

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

    Fixed in 5.4.0-1040.44
  27. Upgrade

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

    Fixed in 5.4.0-1073.78
  28. Upgrade

    Upgrade ubuntu/linux-gcp-5.11 to a version that resolves this vulnerability.

    Fixed in 5.11.0-1029.33~20.04.3
  29. Upgrade

    Upgrade ubuntu/linux-gcp-5.13 to a version that resolves this vulnerability.

    Fixed in 5.13.0-1013.16~20.04.1
  30. Upgrade

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

    Fixed in 5.4.0-1071.76
  31. Upgrade

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

    Fixed in 5.4.0-1040.41
  32. Upgrade

    Upgrade ubuntu/linux-hwe-5.13 to a version that resolves this vulnerability.

    Fixed in 5.13.0-28.31~20.04.1
  33. Upgrade

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

    Fixed in 5.4.0-1021.23
  34. Upgrade

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

    Fixed in 5.4.0-1004.6
  35. Upgrade

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

    Fixed in 5.4.0-1063.66
  36. Upgrade

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

    Fixed in 5.10.0-1053.55
  37. Upgrade

    Upgrade ubuntu/linux-oem-5.13 to a version that resolves this vulnerability.

    Fixed in 5.13.0-1029.36
  38. Upgrade

    Upgrade ubuntu/linux-oem-5.14 to a version that resolves this vulnerability.

    Fixed in 5.14.0-1022.24
  39. Upgrade

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

    Fixed in 5.4.0-1071.77
  40. Upgrade

    Upgrade ubuntu/linux-oracle-5.11 to a version that resolves this vulnerability.

    Fixed in 5.11.0-1028.31~20.04.1
  41. Upgrade

    Upgrade ubuntu/linux-oracle-5.13 to a version that resolves this vulnerability.

    Fixed in 5.13.0-1016.20~20.04.1
  42. Upgrade

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

    Fixed in 5.4.0-1060.68
  43. Upgrade

    Upgrade ubuntu/linux-azure-fde-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1114.123~20.04.1
  44. Upgrade

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

    Fixed in 5.4.0-1073.78+fips1
  45. Upgrade

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

    Fixed in 5.4.0-1078.81+fips1
  46. Upgrade

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

    Fixed in 5.4.0-1049.55
  47. Upgrade

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

    Fixed in 5.4.0-1073.78+fips1
  48. Configuration

    Blacklist the nouveau kernel module to prevent it from being loaded automatically.

    Linux kernel nouveau module module loading = blacklisted/disabled

Event History

Nov 3, 2020
CVE Published
12:00 AM
Nov 25, 2020
Data Sourced
via Red Hat·09:08 PM
DescriptionSeverityAffected Software
Nov 2, 2021
CVE Published
via MITRE·11:26 PM
Data Sourced
via MITRE·11:26 PM
DescriptionWeakness
Nov 3, 2021
Data Sourced
via OSV·12:15 AM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2020-27820?

CVE-2020-27820 has been classified as a high severity vulnerability due to the potential for exploitation leading to denial of service.

2

How do I fix CVE-2020-27820?

To remediate CVE-2020-27820, you should upgrade to the patched versions of the kernel, specifically kernel-rt or kernel versions 0:4.18.0-372.9.1.rt7.166.el8 or 0:4.18.0-372.9.1.el8.

3

Which software is affected by CVE-2020-27820?

CVE-2020-27820 affects several versions of the Linux kernel, specifically versions between 2.6.12 and 5.15.5.

4

Is there a known workaround for CVE-2020-27820?

Currently, there are no effective workarounds recommended for CVE-2020-27820, and patching is the advised course of action.

5

What type of vulnerability is CVE-2020-27820?

CVE-2020-27820 is a use-after-free vulnerability that occurs in the nouveau driver's postclose() handler within the Linux kernel.

Company

Resources

Contact

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