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CVE-2018-20856

Publication date 26 July 2019

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.8 · High

Score breakdown

An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.

From the Ubuntu Security Team

It was discovered that a use-after-free error existed in the block layer subsystem of the Linux kernel when certain failure conditions occurred. A local attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Status

Package Ubuntu Release Status
linux 19.04 disco
Not affected
18.04 LTS bionic
Fixed 4.15.0-58.64
16.04 LTS xenial
Fixed 4.4.0-161.189
14.04 LTS trusty
Not affected
linux-aws 19.04 disco
Not affected
18.04 LTS bionic
Fixed 4.15.0-1047.49
16.04 LTS xenial
Fixed 4.4.0-1092.103
14.04 LTS trusty Ignored
linux-aws-hwe 19.04 disco Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial
Fixed 4.15.0-1047.49~16.04.1
14.04 LTS trusty Not in release
linux-azure 19.04 disco
Not affected
18.04 LTS bionic
Fixed 4.18.0-1011.11~18.04.1
16.04 LTS xenial
Fixed 4.15.0-1055.60
14.04 LTS trusty Ignored
linux-azure-edge 19.04 disco Not in release
18.04 LTS bionic
Fixed 4.18.0-1011.11~18.04.1
16.04 LTS xenial
Fixed 4.15.0-1055.60
14.04 LTS trusty Not in release
linux-euclid 19.04 disco Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-flo 19.04 disco Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-gcp 19.04 disco
Not affected
18.04 LTS bionic
Fixed 4.15.0-1040.42
16.04 LTS xenial
Fixed 4.15.0-1040.42~16.04.1
14.04 LTS trusty Not in release
linux-gcp-edge 19.04 disco Not in release
18.04 LTS bionic
Fixed 4.15.0-1040.42
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke 19.04 disco Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-gke-4.15 19.04 disco Not in release
18.04 LTS bionic
Fixed 4.15.0-1040.42
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke-5.0 19.04 disco Not in release
18.04 LTS bionic
Not affected
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-goldfish 19.04 disco Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-grouper 19.04 disco 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-hwe 19.04 disco Not in release
18.04 LTS bionic
Not affected
16.04 LTS xenial
Fixed 4.15.0-58.64~16.04.1
14.04 LTS trusty Not in release
linux-hwe-edge 19.04 disco Not in release
18.04 LTS bionic
Not affected
16.04 LTS xenial
Fixed 4.15.0-58.64~16.04.1
14.04 LTS trusty Not in release
linux-kvm 19.04 disco
Not affected
18.04 LTS bionic
Fixed 4.15.0-1042.42
16.04 LTS xenial
Fixed 4.4.0-1056.63
14.04 LTS trusty Not in release
linux-lts-trusty 19.04 disco 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-utopic 19.04 disco 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-vivid 19.04 disco 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-wily 19.04 disco 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 19.04 disco Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Ignored
linux-maguro 19.04 disco 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-mako 19.04 disco Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-manta 19.04 disco 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-oem 19.04 disco
Fixed 4.15.0-1050.57
18.04 LTS bionic
Fixed 4.15.0-1050.57
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-oracle 19.04 disco
Fixed 5.0.0-1004.8
18.04 LTS bionic
Fixed 4.15.0-1021.23
16.04 LTS xenial
Fixed 4.15.0-1021.23~16.04.1
14.04 LTS trusty Not in release
linux-raspi2 19.04 disco
Not affected
18.04 LTS bionic
Fixed 4.15.0-1043.46
16.04 LTS xenial
Fixed 4.4.0-1120.129
14.04 LTS trusty Not in release
linux-snapdragon 19.04 disco
Not affected
18.04 LTS bionic
Fixed 4.15.0-1060.66
16.04 LTS xenial
Fixed 4.4.0-1124.130
14.04 LTS trusty Not in release

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:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H