CVE-2020-0466: Use After Free

Published Dec 1, 2020
·
Updated

A flaw was found in the Linux kernel. A logic error in eventpoll.c can cause a use-after-free, leading to a local escalation of privilege with no additional execution privileges. User interaction is not needed for exploitation. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.

Other sources

Google Android could allow a local attacker to gain elevated privileges on the system, caused by a logic error in doepollctl and eploopcheckproc of eventpoll.c. By executing a specially-crafted program, an attacker could exploit this vulnerability to escalate privileges.

— IBM

In doepollctl and eploopcheckproc of eventpoll.c, there is a possible use after free due to a logic error. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

— OSV

Affected Software

93 affected componentsFixes available
redhat/kernel<0:2.6.32-754.47.1.el6
0:2.6.32-754.47.1.el6
redhat/kernel-rt<0:3.10.0-1160.59.1.rt56.1200.el7
0:3.10.0-1160.59.1.rt56.1200.el7
redhat/kernel<0:3.10.0-1160.59.1.el7
0:3.10.0-1160.59.1.el7
redhat/kernel<0:3.10.0-514.97.1.el7
0:3.10.0-514.97.1.el7
redhat/kernel<0:3.10.0-693.99.1.el7
0:3.10.0-693.99.1.el7
redhat/kernel<0:3.10.0-957.88.1.el7
0:3.10.0-957.88.1.el7
redhat/kernel<0:3.10.0-1062.63.1.el7
0:3.10.0-1062.63.1.el7
redhat/kernel-rt<0:4.18.0-240.22.1.rt7.77.el8_3
0:4.18.0-240.22.1.rt7.77.el8_3
redhat/kernel<0:4.18.0-240.22.1.el8_3
0:4.18.0-240.22.1.el8_3
redhat/kernel<0:4.18.0-147.48.1.el8_1
0:4.18.0-147.48.1.el8_1
redhat/kernel-rt<0:4.18.0-193.56.1.rt13.106.el8_2
0:4.18.0-193.56.1.rt13.106.el8_2
redhat/kernel<0:4.18.0-193.56.1.el8_2
0:4.18.0-193.56.1.el8_2
Google Android
IBM BM Security Guardium<=11.3
IBM Security Guardium<=11.4
IBM Security Guardium<=11.5
debian/linux
5.10.223-15.10.234-16.1.129-16.1.135-16.12.22-16.12.25-1
redhat/kernel-rt<3.10.0-1160.57.1.rt56.1198.el7
3.10.0-1160.57.1.rt56.1198.el7
Google Android
android/:linux_kernel:>=:0<:2020-12-05
:2020-12-05
ubuntu/linux-aws<4.4.0-1081.85
4.4.0-1081.85
ubuntu/linux-azure<4.15.0-1098.109~14.04.1
4.15.0-1098.109~14.04.1
ubuntu/linux-lts-xenial<4.4.0-193.224~14.04.1
4.4.0-193.224~14.04.1
ubuntu/linux*
ubuntu/linux<4.4.0-193.224
4.4.0-193.224
ubuntu/linux-aws<4.4.0-1117.131
4.4.0-1117.131
ubuntu/linux-aws-hwe<4.15.0-1085.90~16.04.1
4.15.0-1085.90~16.04.1
ubuntu/linux-azure<4.15.0-1098.109~16.04.1
4.15.0-1098.109~16.04.1
ubuntu/linux-gcp<4.15.0-1086.98~16.04.1
4.15.0-1086.98~16.04.1
ubuntu/linux-hwe<4.15.0-120.122~16.04.1
4.15.0-120.122~16.04.1
ubuntu/linux-kvm<4.4.0-1082.91
4.4.0-1082.91
ubuntu/linux-oracle<4.15.0-1056.61~16.04.1
4.15.0-1056.61~16.04.1
ubuntu/linux-raspi2<4.4.0-1141.151
4.4.0-1141.151
ubuntu/linux-snapdragon<4.4.0-1145.155
4.4.0-1145.155
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1048.53
4.4.0-1048.53
ubuntu/linux-fips*
ubuntu/linux<4.15.0-121.123
4.15.0-121.123
ubuntu/linux-aws<4.15.0-1086.91
4.15.0-1086.91
ubuntu/linux-aws-5.4<5.4.0-1028.29~18.04.1
5.4.0-1028.29~18.04.1
ubuntu/linux-azure-4.15<4.15.0-1099.110
4.15.0-1099.110
ubuntu/linux-azure-5.4<5.4.0-1031.32~18.04.1
5.4.0-1031.32~18.04.1
ubuntu/linux-gcp-4.15<4.15.0-1086.98
4.15.0-1086.98
ubuntu/linux-gcp-5.4<5.4.0-1028.29~18.04.1
5.4.0-1028.29~18.04.1
ubuntu/linux-gke-4.15<4.15.0-1072.76
4.15.0-1072.76
ubuntu/linux-gke-5.4<5.4.0-1027.28~18.04.1
5.4.0-1027.28~18.04.1
ubuntu/linux-gkeop-5.4<5.4.0-1003.3
5.4.0-1003.3
ubuntu/linux-hwe-5.4<5.4.0-51.56~18.04.1
5.4.0-51.56~18.04.1
ubuntu/linux-kvm<4.15.0-1077.79
4.15.0-1077.79
ubuntu/linux-oracle<4.15.0-1057.62
4.15.0-1057.62
ubuntu/linux-oracle-5.4<5.4.0-1028.29~18.04.1
5.4.0-1028.29~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1021.24~18.04.1
5.4.0-1021.24~18.04.1
ubuntu/linux-raspi2<4.15.0-1073.78
4.15.0-1073.78
ubuntu/linux-snapdragon<4.15.0-1089.98
4.15.0-1089.98
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-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-fips<4.15.0-2030.31
4.15.0-2030.31
ubuntu/linux-azure-fips<4.15.0-2012.14
4.15.0-2012.14
ubuntu/linux-fips<4.15.0-1044.50
4.15.0-1044.50
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-51.56
5.4.0-51.56
ubuntu/linux-aws<5.4.0-1028.29
5.4.0-1028.29
ubuntu/linux-azure<5.4.0-1031.32
5.4.0-1031.32
ubuntu/linux-gcp<5.4.0-1028.29
5.4.0-1028.29
ubuntu/linux-kvm<5.4.0-1026.27
5.4.0-1026.27
ubuntu/linux-oem-5.6<5.6.0-1053.57
5.6.0-1053.57
ubuntu/linux-oracle<5.4.0-1028.29
5.4.0-1028.29
ubuntu/linux-raspi<5.4.0-1021.24
5.4.0-1021.24
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-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 to a version that resolves this vulnerability.

    Fixed in 0:2.6.32-754.47.1.el6
  2. Upgrade

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

    Fixed in 0:3.10.0-1160.59.1.rt56.1200.el7
  3. Upgrade

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

    Fixed in 0:3.10.0-1160.59.1.el7
  4. Upgrade

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

    Fixed in 0:3.10.0-514.97.1.el7
  5. Upgrade

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

    Fixed in 0:3.10.0-693.99.1.el7
  6. Upgrade

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

    Fixed in 0:3.10.0-957.88.1.el7
  7. Upgrade

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

    Fixed in 0:3.10.0-1062.63.1.el7
  8. Upgrade

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

    Fixed in 0:4.18.0-240.22.1.rt7.77.el8_3
  9. Upgrade

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

    Fixed in 0:4.18.0-240.22.1.el8_3
  10. Upgrade

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

    Fixed in 0:4.18.0-147.48.1.el8_1
  11. Upgrade

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

    Fixed in 0:4.18.0-193.56.1.rt13.106.el8_2
  12. Upgrade

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

    Fixed in 0:4.18.0-193.56.1.el8_2
  13. 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 6.12.22-1Fixed in 6.12.25-1
  14. Upgrade

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

    Fixed in 3.10.0-1160.57.1.rt56.1198.el7
  15. Upgrade

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

    Fixed in :2020-12-05
  16. Upgrade

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

    Fixed in 4.4.0-1081.85
  17. Upgrade

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

    Fixed in 4.15.0-1098.109~14.04.1
  18. Upgrade

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

    Fixed in 4.4.0-193.224~14.04.1
  19. Upgrade

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

    Fixed in 4.4.0-193.224
  20. Upgrade

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

    Fixed in 4.4.0-1117.131
  21. Upgrade

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

    Fixed in 4.15.0-1085.90~16.04.1
  22. Upgrade

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

    Fixed in 4.15.0-1098.109~16.04.1
  23. Upgrade

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

    Fixed in 4.15.0-1086.98~16.04.1
  24. Upgrade

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

    Fixed in 4.15.0-120.122~16.04.1
  25. Upgrade

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

    Fixed in 4.4.0-1082.91
  26. Upgrade

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

    Fixed in 4.15.0-1056.61~16.04.1
  27. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.4.0-1141.151
  28. Upgrade

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

    Fixed in 4.4.0-1145.155
  29. Upgrade

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

    Fixed in 4.4.0-1048.53
  30. Upgrade

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

    Fixed in 4.15.0-121.123
  31. Upgrade

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

    Fixed in 4.15.0-1086.91
  32. Upgrade

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

    Fixed in 5.4.0-1028.29~18.04.1
  33. Upgrade

    Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1099.110
  34. Upgrade

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

    Fixed in 5.4.0-1031.32~18.04.1
  35. Upgrade

    Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1086.98
  36. Upgrade

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

    Fixed in 5.4.0-1028.29~18.04.1
  37. Upgrade

    Upgrade ubuntu/linux-gke-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1072.76
  38. Upgrade

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

    Fixed in 5.4.0-1027.28~18.04.1
  39. Upgrade

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

    Fixed in 5.4.0-1003.3
  40. Upgrade

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

    Fixed in 5.4.0-51.56~18.04.1
  41. Upgrade

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

    Fixed in 4.15.0-1077.79
  42. Upgrade

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

    Fixed in 4.15.0-1057.62
  43. Upgrade

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

    Fixed in 5.4.0-1028.29~18.04.1
  44. Upgrade

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

    Fixed in 5.4.0-1021.24~18.04.1
  45. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1073.78
  46. Upgrade

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

    Fixed in 4.15.0-1089.98
  47. Upgrade

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

    Fixed in 4.15.0-2030.31
  48. Upgrade

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

    Fixed in 4.15.0-2012.14
  49. Upgrade

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

    Fixed in 4.15.0-1044.50
  50. Upgrade

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

    Fixed in 5.4.0-51.56
  51. Upgrade

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

    Fixed in 5.4.0-1028.29
  52. Upgrade

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

    Fixed in 5.4.0-1031.32
  53. Upgrade

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

    Fixed in 5.4.0-1028.29
  54. Upgrade

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

    Fixed in 5.4.0-1026.27
  55. Upgrade

    Upgrade ubuntu/linux-oem-5.6 to a version that resolves this vulnerability.

    Fixed in 5.6.0-1053.57
  56. Upgrade

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

    Fixed in 5.4.0-1028.29
  57. Upgrade

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

    Fixed in 5.4.0-1021.24
  58. Upgrade

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

    Fixed in 5.4.0-1069.73+fips2
  59. Upgrade

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

    Fixed in 5.4.0-1073.76+fips1
  60. Upgrade

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

    Fixed in 5.4.0-1067.71~20.04.1

Event History

Dec 1, 2020
Advisory Published
via OSV·12:00 AM
Data Sourced
via OSV·12:00 AM
DescriptionAffected Software
Dec 7, 2020
CVE Published
via Android·12:00 AM
Data Sourced
via Android·12:00 AM
SeverityWeaknessAffected Software
Dec 14, 2020
CVE Published
via MITRE·09:50 PM
Data Sourced
via MITRE·09:50 PM
DescriptionWeakness
Data Sourced
via OSV·10:15 PM
Severity
Jan 26, 2021
Data Sourced
via Red Hat·11:46 AM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2020-0466?

CVE-2020-0466 is rated as a high-severity vulnerability due to its potential for local privilege escalation.

2

How do I fix CVE-2020-0466?

To remediate CVE-2020-0466, update to the latest kernel versions specified in the vendor advisories.

3

Who is affected by CVE-2020-0466?

CVE-2020-0466 primarily affects users running specific versions of the Linux kernel on Red Hat and Debian systems.

4

What type of vulnerability is CVE-2020-0466?

CVE-2020-0466 is a use-after-free vulnerability found in the Linux kernel's eventpoll component.

5

Is user interaction required to exploit CVE-2020-0466?

No, CVE-2020-0466 can be exploited without any user interaction.

Company

Resources

Contact

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