CVE-2020-14416: Use After Free

Published Jun 18, 2020
·
Updated

In the Linux kernel before 5.4.16, a race condition in tty->discdata handling in the slip and slcan line discipline could lead to a use-after-free, aka CID-0ace17d56824. This affects drivers/net/slip/slip.c and drivers/net/can/slcan.c.

Affected Software

55 affected componentsFixes available
Linux Linux kernel<5.4.16
openSUSE Leap=15.1
openSUSE Leap=15.2
ubuntu/linux-aws<4.4.0-1064.68
4.4.0-1064.68
ubuntu/linux-azure<4.15.0-1074.79~14.04.1
4.15.0-1074.79~14.04.1
ubuntu/linux-lts-xenial<4.4.0-176.206~14.04.1
4.4.0-176.206~14.04.1
ubuntu/linux*
ubuntu/linux<4.4.0-176.206
4.4.0-176.206
ubuntu/linux-aws<4.4.0-1104.115
4.4.0-1104.115
ubuntu/linux-aws-hwe<4.15.0-1063.67~16.04.1
4.15.0-1063.67~16.04.1
ubuntu/linux-azure<4.15.0-1075.80
4.15.0-1075.80
ubuntu/linux-gcp<4.15.0-1058.62
4.15.0-1058.62
ubuntu/linux-hwe<4.15.0-91.92~16.04.1
4.15.0-91.92~16.04.1
ubuntu/linux-kvm<4.4.0-1068.75
4.4.0-1068.75
ubuntu/linux-oracle<4.15.0-1035.38~16.04.1
4.15.0-1035.38~16.04.1
ubuntu/linux-raspi2<4.4.0-1130.139
4.4.0-1130.139
ubuntu/linux-snapdragon<4.4.0-1134.142
4.4.0-1134.142
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1031.36
4.4.0-1031.36
ubuntu/linux-fips*
ubuntu/linux<4.15.0-91.92
4.15.0-91.92
ubuntu/linux-aws<4.15.0-1063.67
4.15.0-1063.67
ubuntu/linux-azure-5.3<5.3.0-1016.17~18.04.1
5.3.0-1016.17~18.04.1
ubuntu/linux-gcp-5.3<5.3.0-1014.15~18.04.1
5.3.0-1014.15~18.04.1
ubuntu/linux-gke-4.15<4.15.0-1055.58
4.15.0-1055.58
ubuntu/linux-gke-5.0<5.0.0-1032.33
5.0.0-1032.33
ubuntu/linux-gke-5.3<5.3.0-1014.15~18.04.1
5.3.0-1014.15~18.04.1
ubuntu/linux-hwe<5.3.0-42.34~18.04.1
5.3.0-42.34~18.04.1
ubuntu/linux-kvm<4.15.0-1056.57
4.15.0-1056.57
ubuntu/linux-oem<4.15.0-1076.86
4.15.0-1076.86
ubuntu/linux-oem-osp1<5.0.0-1043.48
5.0.0-1043.48
ubuntu/linux-oracle<4.15.0-1035.39
4.15.0-1035.39
ubuntu/linux-raspi2<4.15.0-1057.61
4.15.0-1057.61
ubuntu/linux-raspi2-5.3<5.3.0-1019.21~18.04.1
5.3.0-1019.21~18.04.1
ubuntu/linux-snapdragon<4.15.0-1074.81
4.15.0-1074.81
ubuntu/linux-aws-5.0*
ubuntu/linux-azure*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-edge*
ubuntu/linux-hwe-edge*
ubuntu/linux-oracle-5.0*
ubuntu/linux-aws-fips<4.15.0-2018.18
4.15.0-2018.18
ubuntu/linux-azure-fips<4.15.0-2006.7
4.15.0-2006.7
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-azure-fde*
ubuntu/linux-azure-fde-5.15<5.15.0-1114.123~20.04.1
5.15.0-1114.123~20.04.1
ubuntu/linux-gke*
ubuntu/linux-raspi2*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-raspi-realtime*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 4.4.0-1064.68
  2. Upgrade

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

    Fixed in 4.15.0-1074.79~14.04.1
  3. Upgrade

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

    Fixed in 4.4.0-176.206~14.04.1
  4. Upgrade

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

    Fixed in 4.4.0-176.206
  5. Upgrade

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

    Fixed in 4.4.0-1104.115
  6. Upgrade

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

    Fixed in 4.15.0-1063.67~16.04.1
  7. Upgrade

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

    Fixed in 4.15.0-1075.80
  8. Upgrade

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

    Fixed in 4.15.0-1058.62
  9. Upgrade

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

    Fixed in 4.15.0-91.92~16.04.1
  10. Upgrade

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

    Fixed in 4.4.0-1068.75
  11. Upgrade

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

    Fixed in 4.15.0-1035.38~16.04.1
  12. Upgrade

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

    Fixed in 4.4.0-1130.139
  13. Upgrade

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

    Fixed in 4.4.0-1134.142
  14. Upgrade

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

    Fixed in 4.4.0-1031.36
  15. Upgrade

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

    Fixed in 4.15.0-91.92
  16. Upgrade

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

    Fixed in 4.15.0-1063.67
  17. Upgrade

    Upgrade ubuntu/linux-azure-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1016.17~18.04.1
  18. Upgrade

    Upgrade ubuntu/linux-gcp-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1014.15~18.04.1
  19. Upgrade

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

    Fixed in 4.15.0-1055.58
  20. Upgrade

    Upgrade ubuntu/linux-gke-5.0 to a version that resolves this vulnerability.

    Fixed in 5.0.0-1032.33
  21. Upgrade

    Upgrade ubuntu/linux-gke-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1014.15~18.04.1
  22. Upgrade

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

    Fixed in 5.3.0-42.34~18.04.1
  23. Upgrade

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

    Fixed in 4.15.0-1056.57
  24. Upgrade

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

    Fixed in 4.15.0-1076.86
  25. Upgrade

    Upgrade ubuntu/linux-oem-osp1 to a version that resolves this vulnerability.

    Fixed in 5.0.0-1043.48
  26. Upgrade

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

    Fixed in 4.15.0-1035.39
  27. Upgrade

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

    Fixed in 4.15.0-1057.61
  28. Upgrade

    Upgrade ubuntu/linux-raspi2-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1019.21~18.04.1
  29. Upgrade

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

    Fixed in 4.15.0-1074.81
  30. Upgrade

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

    Fixed in 4.15.0-2018.18
  31. Upgrade

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

    Fixed in 4.15.0-2006.7
  32. 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

Event History

Jun 18, 2020
CVE Published
via MITRE·10:45 AM
Data Sourced
via MITRE·10:45 AM
Description
Data Sourced
via OSV·11:15 AM
DescriptionSeverityAffected Software
Data Sourced
via NVD·11:15 AM
RemedyDescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

1

What level of access is required to exploit this issue?

The CVSS vector indicates that exploitation requires local access and high privileges, as well as user interaction. It is not described as remotely exploitable.

2

What is the expected security impact if exploitation succeeds?

The reported impact is on availability, with high availability impact. No confidentiality or integrity impact is indicated in the CVSS vector.

3

What should affected systems do to remediate the issue?

Apply the available patch. The issue affects Linux kernel versions before 5.4.16.

Company

Resources

Contact

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