CVE-2020-25671: Use After Free

Published May 26, 2021
·
Updated

A vulnerability was found in Linux Kernel, where a refcount leak in llcpsockconnect() causing use-after-free which might lead to privilege escalations.

Affected Software

134 affected componentsFixes available
Linux Linux kernel>=3.6<4.4.267
Linux Linux kernel>=4.5<4.9.267
Linux Linux kernel>=4.10<4.14.231
Linux Linux kernel>=4.15<4.19.187
Linux Linux kernel>=4.20<5.4.112
Linux Linux kernel>=5.5<5.10.30
Linux Linux kernel>=5.11<5.11.14
Fedoraproject Fedora=32
Fedoraproject Fedora=33
Fedoraproject Fedora=34
NetApp Active Iq Unified Manager Vsphere
NetApp Cloud Backup
All of the following
NetApp Solidfire Baseboard Management Controller Firmware
NetApp Solidfire Baseboard Management Controller
All of the following
NetApp H410c Firmware
NetApp H410c
All of the following
NetApp H300s Firmware
NetApp H300s
All of the following
NetApp H500s Firmware
NetApp H500s
All of the following
NetApp H700s Firmware
NetApp H700s
All of the following
NetApp H300e Firmware
NetApp H300e
All of the following
NetApp H500e Firmware
NetApp H500e
All of the following
NetApp H700e Firmware
NetApp H700e
All of the following
NetApp H410s Firmware
NetApp H410s
Debian Debian Linux=9.0
NetApp Solidfire Baseboard Management Controller Firmware
NetApp Solidfire Baseboard Management Controller
NetApp H410c Firmware
NetApp H410c
NetApp H300s Firmware
NetApp H300s
NetApp H500s Firmware
NetApp H500s
NetApp H700s Firmware
NetApp H700s
NetApp H300e Firmware
NetApp H300e
NetApp H500e Firmware
NetApp H500e
NetApp H700e Firmware
NetApp H700e
NetApp H410s Firmware
NetApp H410s
debian/linux
5.10.223-15.10.234-16.1.129-16.1.135-16.12.25-16.12.27-1
ubuntu/linux-aws<4.4.0-1102.107
4.4.0-1102.107
ubuntu/linux-azure<4.15.0-1115.128~14.04.1
4.15.0-1115.128~14.04.1
ubuntu/linux-lts-xenial<4.4.0-222.255~14.04.1
4.4.0-222.255~14.04.1
ubuntu/linux*
ubuntu/linux<4.4.0-222.255
4.4.0-222.255
ubuntu/linux-aws<4.4.0-1138.152
4.4.0-1138.152
ubuntu/linux-aws-hwe<4.15.0-1103.110~16.04.1
4.15.0-1103.110~16.04.1
ubuntu/linux-azure<4.15.0-1115.128~16.04.1
4.15.0-1115.128~16.04.1
ubuntu/linux-gcp<4.15.0-1100.113~16.04.1
4.15.0-1100.113~16.04.1
ubuntu/linux-hwe<4.15.0-144.148~16.04.1
4.15.0-144.148~16.04.1
ubuntu/linux-kvm<4.4.0-1103.112
4.4.0-1103.112
ubuntu/linux-oracle<4.15.0-1072.80~16.04.1
4.15.0-1072.80~16.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1072.78
4.4.0-1072.78
ubuntu/linux-fips*
ubuntu/linux<4.15.0-144.148
4.15.0-144.148
ubuntu/linux-aws<4.15.0-1103.110
4.15.0-1103.110
ubuntu/linux-aws-5.4<5.4.0-1049.51~18.04.1
5.4.0-1049.51~18.04.1
ubuntu/linux-azure-4.15<4.15.0-1115.128
4.15.0-1115.128
ubuntu/linux-azure-5.4<5.4.0-1048.50~18.04.1
5.4.0-1048.50~18.04.1
ubuntu/linux-dell300x<4.15.0-1022.26
4.15.0-1022.26
ubuntu/linux-gcp-4.15<4.15.0-1100.113
4.15.0-1100.113
ubuntu/linux-gcp-5.4<5.4.0-1044.47~18.04.2
5.4.0-1044.47~18.04.2
ubuntu/linux-gke-5.4<5.4.0-1044.46~18.04.1
5.4.0-1044.46~18.04.1
ubuntu/linux-gkeop-5.4<5.4.0-1016.17~18.04.1
5.4.0-1016.17~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-74.83~18.04.1
5.4.0-74.83~18.04.1
ubuntu/linux-kvm<4.15.0-1092.94
4.15.0-1092.94
ubuntu/linux-oracle<4.15.0-1072.80
4.15.0-1072.80
ubuntu/linux-oracle-5.4<5.4.0-1046.50~18.04.2
5.4.0-1046.50~18.04.2
ubuntu/linux-raspi-5.4<5.4.0-1036.39~18.04.1
5.4.0-1036.39~18.04.1
ubuntu/linux-raspi2<4.15.0-1086.91
4.15.0-1086.91
ubuntu/linux-snapdragon<4.15.0-1103.112
4.15.0-1103.112
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-gke-4.15*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-fips<4.15.0-2045.47
4.15.0-2045.47
ubuntu/linux-azure-fips<4.15.0-2027.30
4.15.0-2027.30
ubuntu/linux-fips<4.15.0-1060.68
4.15.0-1060.68
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-74.83
5.4.0-74.83
ubuntu/linux-aws<5.4.0-1049.51
5.4.0-1049.51
ubuntu/linux-aws-5.8<5.8.0-1038.40~20.04.1
5.8.0-1038.40~20.04.1
ubuntu/linux-azure<5.4.0-1048.50
5.4.0-1048.50
ubuntu/linux-azure-5.8<5.8.0-1036.38~20.04.1
5.8.0-1036.38~20.04.1
ubuntu/linux-bluefield<5.4.0-1012.15
5.4.0-1012.15
ubuntu/linux-gcp<5.4.0-1044.47
5.4.0-1044.47
ubuntu/linux-gcp-5.8<5.8.0-1035.37~20.04.1
5.8.0-1035.37~20.04.1
ubuntu/linux-gke<5.4.0-1044.46
5.4.0-1044.46
ubuntu/linux-gkeop<5.4.0-1016.17
5.4.0-1016.17
ubuntu/linux-hwe-5.8<5.8.0-59.66~20.04.1
5.8.0-59.66~20.04.1
ubuntu/linux-kvm<5.4.0-1040.41
5.4.0-1040.41
ubuntu/linux-oem-5.10<5.10.0-1025.26
5.10.0-1025.26
ubuntu/linux-oracle<5.4.0-1046.50
5.4.0-1046.50
ubuntu/linux-oracle-5.8<5.8.0-1033.34~20.04.1
5.8.0-1033.34~20.04.1
ubuntu/linux-raspi<5.4.0-1036.39
5.4.0-1036.39
ubuntu/linux-riscv-5.8<5.8.0-29.31~20.04.1
5.8.0-29.31~20.04.1
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 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
  2. Upgrade

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

    Fixed in 4.4.0-1102.107
  3. Upgrade

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

    Fixed in 4.15.0-1115.128~14.04.1
  4. Upgrade

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

    Fixed in 4.4.0-222.255~14.04.1
  5. Upgrade

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

    Fixed in 4.4.0-222.255
  6. Upgrade

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

    Fixed in 4.4.0-1138.152
  7. Upgrade

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

    Fixed in 4.15.0-1103.110~16.04.1
  8. Upgrade

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

    Fixed in 4.15.0-1115.128~16.04.1
  9. Upgrade

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

    Fixed in 4.15.0-1100.113~16.04.1
  10. Upgrade

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

    Fixed in 4.15.0-144.148~16.04.1
  11. Upgrade

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

    Fixed in 4.4.0-1103.112
  12. Upgrade

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

    Fixed in 4.15.0-1072.80~16.04.1
  13. Upgrade

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

    Fixed in 4.4.0-1072.78
  14. Upgrade

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

    Fixed in 4.15.0-144.148
  15. Upgrade

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

    Fixed in 4.15.0-1103.110
  16. Upgrade

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

    Fixed in 5.4.0-1049.51~18.04.1
  17. Upgrade

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

    Fixed in 4.15.0-1115.128
  18. Upgrade

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

    Fixed in 5.4.0-1048.50~18.04.1
  19. Upgrade

    Upgrade ubuntu/linux-dell300x to a version that resolves this vulnerability.

    Fixed in 4.15.0-1022.26
  20. Upgrade

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

    Fixed in 4.15.0-1100.113
  21. Upgrade

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

    Fixed in 5.4.0-1044.47~18.04.2
  22. Upgrade

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

    Fixed in 5.4.0-1044.46~18.04.1
  23. Upgrade

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

    Fixed in 5.4.0-1016.17~18.04.1
  24. Upgrade

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

    Fixed in 5.4.0-74.83~18.04.1
  25. Upgrade

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

    Fixed in 4.15.0-1092.94
  26. Upgrade

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

    Fixed in 4.15.0-1072.80
  27. Upgrade

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

    Fixed in 5.4.0-1046.50~18.04.2
  28. Upgrade

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

    Fixed in 5.4.0-1036.39~18.04.1
  29. Upgrade

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

    Fixed in 4.15.0-1086.91
  30. Upgrade

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

    Fixed in 4.15.0-1103.112
  31. Upgrade

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

    Fixed in 4.15.0-2045.47
  32. Upgrade

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

    Fixed in 4.15.0-2027.30
  33. Upgrade

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

    Fixed in 4.15.0-1060.68
  34. Upgrade

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

    Fixed in 5.4.0-74.83
  35. Upgrade

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

    Fixed in 5.4.0-1049.51
  36. Upgrade

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

    Fixed in 5.8.0-1038.40~20.04.1
  37. Upgrade

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

    Fixed in 5.4.0-1048.50
  38. Upgrade

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

    Fixed in 5.8.0-1036.38~20.04.1
  39. Upgrade

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

    Fixed in 5.4.0-1012.15
  40. Upgrade

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

    Fixed in 5.4.0-1044.47
  41. Upgrade

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

    Fixed in 5.8.0-1035.37~20.04.1
  42. Upgrade

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

    Fixed in 5.4.0-1044.46
  43. Upgrade

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

    Fixed in 5.4.0-1016.17
  44. Upgrade

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

    Fixed in 5.8.0-59.66~20.04.1
  45. Upgrade

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

    Fixed in 5.4.0-1040.41
  46. Upgrade

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

    Fixed in 5.10.0-1025.26
  47. Upgrade

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

    Fixed in 5.4.0-1046.50
  48. Upgrade

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

    Fixed in 5.8.0-1033.34~20.04.1
  49. Upgrade

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

    Fixed in 5.4.0-1036.39
  50. Upgrade

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

    Fixed in 5.8.0-29.31~20.04.1
  51. Upgrade

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

    Fixed in 5.4.0-1069.73+fips2
  52. Upgrade

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

    Fixed in 5.4.0-1073.76+fips1
  53. 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

Nov 2, 2020
CVE Published
via OSV·12:00 AM
Data Sourced
via OSV·12:00 AM
DescriptionSeverityAffected Software
May 26, 2021
CVE Published
via MITRE·10:44 AM
Data Sourced
via MITRE·10:44 AM
DescriptionWeakness

Frequently Asked Questions

1

What is the severity of CVE-2020-25671?

CVE-2020-25671 is considered a high severity vulnerability due to its potential to allow privilege escalation.

2

How do I fix CVE-2020-25671?

To fix CVE-2020-25671, users should upgrade to patched versions of the Linux Kernel, such as 5.10.223-1 or later.

3

What causes CVE-2020-25671?

CVE-2020-25671 is caused by a refcount leak in the llcp_sock_connect() function, leading to a use-after-free condition.

4

Which Linux Kernel versions are affected by CVE-2020-25671?

CVE-2020-25671 affects Linux Kernel versions from 3.6 to 4.4.267, 4.5 to 4.9.267, 4.10 to 4.14.231, 4.15 to 4.19.187, 4.20 to 5.4.112, and 5.5 to 5.11.14.

5

Is CVE-2020-25671 a known vulnerability for Fedora?

Yes, CVE-2020-25671 is a known vulnerability that affects specific versions of Fedora, specifically Fedora 32, 33, and 34.

Company

Resources

Contact

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