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CVE-2020-14356

Publication date 19 August 2020

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.8 · High

Score breakdown

A flaw null pointer dereference in the Linux kernel cgroupv2 subsystem in versions before 5.7.10 was found in the way when reboot the system. A local user could use this flaw to crash the system or escalate their privileges on the system.

From the Ubuntu Security Team

It was discovered that the cgroup v2 subsystem in the Linux kernel did not properly perform reference counting in some situations, leading to a NULL pointer dereference. A local attacker could use this to cause a denial of service or possibly gain administrative privileges.

Read the notes from the security team

Status

Package Ubuntu Release Status
linux 20.10 groovy
Not affected
20.04 LTS focal
Fixed 5.4.0-45.49
18.04 LTS bionic
Fixed 4.15.0-118.119
16.04 LTS xenial
Not affected
14.04 LTS trusty Ignored
linux-aws 20.10 groovy
Not affected
20.04 LTS focal
Fixed 5.4.0-1022.22
18.04 LTS bionic
Fixed 4.15.0-1083.87
16.04 LTS xenial
Not affected
14.04 LTS trusty Ignored
linux-aws-5.0 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-aws-5.3 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 5.3.0-1034.36
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-aws-5.4 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 5.4.0-1022.22~18.04.1
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-aws-hwe 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial
Fixed 4.15.0-1083.87~16.04.1
14.04 LTS trusty Not in release
linux-azure 20.10 groovy
Not affected
20.04 LTS focal
Fixed 5.4.0-1023.23
18.04 LTS bionic Ignored
16.04 LTS xenial
Fixed 4.15.0-1096.106~16.04.1
14.04 LTS trusty
linux-azure-4.15 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 4.15.0-1096.106
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-azure-5.3 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-azure-5.4 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 5.4.0-1023.23~18.04.1
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-azure-edge 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-dell300x 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Not affected
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gcp 20.10 groovy
Not affected
20.04 LTS focal
Fixed 5.4.0-1022.22
18.04 LTS bionic Ignored
16.04 LTS xenial
Fixed 4.15.0-1084.95~16.04.1
14.04 LTS trusty Not in release
linux-gcp-4.15 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 4.15.0-1084.95
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gcp-5.3 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gcp-5.4 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 5.4.0-1022.22~18.04.1
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gcp-edge 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke-4.15 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 4.15.0-1070.73
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke-5.0 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke-5.3 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 5.3.0-1034.36
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke-5.4 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Not affected
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gkeop 20.10 groovy Not in release
20.04 LTS focal
Not affected
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gkeop-5.4 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Not affected
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-hwe 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 5.3.0-66.60
16.04 LTS xenial
Fixed 4.15.0-118.119~16.04.1
14.04 LTS trusty Not in release
linux-hwe-5.4 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 5.4.0-45.49~18.04.2
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-hwe-5.8 20.10 groovy Not in release
20.04 LTS focal
Not affected
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-hwe-edge 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-kvm 20.10 groovy
Not affected
20.04 LTS focal
Fixed 5.4.0-1021.21
18.04 LTS bionic
Fixed 4.15.0-1075.76
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-lts-trusty 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-lts-xenial 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Ignored
linux-oem 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 4.15.0-1097.107
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-oem-5.10 20.10 groovy Not in release
20.04 LTS focal
Not affected
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-oem-5.6 20.10 groovy Not in release
20.04 LTS focal
Fixed 5.6.0-1021.21
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-oem-osp1 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-oracle 20.10 groovy
Not affected
20.04 LTS focal
Fixed 5.4.0-1022.22
18.04 LTS bionic
Fixed 4.15.0-1054.58
16.04 LTS xenial
Fixed 4.15.0-1054.58~16.04.1
14.04 LTS trusty Not in release
linux-oracle-5.0 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-oracle-5.3 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-oracle-5.4 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 5.4.0-1022.22~18.04.1
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-raspi 20.10 groovy
Not affected
20.04 LTS focal
Fixed 5.4.0-1016.17
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-raspi-5.4 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 5.4.0-1016.17~18.04.1
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-raspi2 20.10 groovy Not in release
20.04 LTS focal Ignored
18.04 LTS bionic
Fixed 4.15.0-1071.75
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-raspi2-5.3 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 5.3.0-1032.34
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-riscv 20.10 groovy
Not affected
20.04 LTS focal
Fixed 5.4.0-31.35
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-snapdragon 20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 4.15.0-1087.95
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release

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Notes

sbeattie

commit 1bfba2f4270c64c912 is in the linux-stable tree hash

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
linux

Severity score breakdown

Parameter Value
Base score 7.8 · High
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-4483-1
    • Linux kernel vulnerabilities
    • 3 September 2020
    • USN-4484-1
    • Linux kernel vulnerability
    • 2 September 2020
    • USN-4526-1
    • Linux kernel vulnerabilities
    • 23 September 2020

Other references