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UBUNTU-CVE-2018-20856

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UBUNTU-CVE-2018-20856

Published: 26 Jul 2019Last Modified: 9 Sept 2026

Upstream:

Aliases:

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2018-20856, https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.7, https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54648cf1ec2d7f4b6a71767799c45676a138ca24, https://github.com/torvalds/linux/commit/54648cf1ec2d7f4b6a71767799c45676a138ca24, https://ubuntu.com/security/notices/USN-4094-1, https://ubuntu.com/security/notices/USN-4116-1, https://ubuntu.com/security/notices/USN-4118-1, https://www.cve.org/CVERecord?id=CVE-2018-20856

Affected packages

Package

Name: linux-aws

Purl: pkg:deb/ubuntu/linux-aws?arch=source&distro=trusty%2Fesm

Affected ranges

Type: ECOSYSTEM

Events:

Introduced- 0

Fixed -4.4.0-1054.58

Affected versions

4.4.0-1002.2

4.4.0-1003.3

4.4.0-1005.5

4.4.0-1006.6

4.4.0-1009.9

4.4.0-1010.10

4.4.0-1011.11

4.4.0-1012.12

4.4.0-1014.14

4.4.0-1016.16

4.4.0-1017.17

4.4.0-1019.19

4.4.0-1022.22

4.4.0-1023.23

4.4.0-1024.25

4.4.0-1025.26

4.4.0-1027.30

4.4.0-1028.31

4.4.0-1029.32

4.4.0-1031.34

4.4.0-1032.35

4.4.0-1034.37

4.4.0-1036.39

4.4.0-1037.40

4.4.0-1038.41

4.4.0-1039.42

4.4.0-1040.43

4.4.0-1042.45

4.4.0-1044.47

4.4.0-1045.48

4.4.0-1046.50

4.4.0-1048.52

4.4.0-1050.54

4.4.0-1052.56

Common Vulnerability Scoring System

Attack Vector

Network

Adjacent

Local

Physical

Privileges Required

None

Low

High

User Interaction

None

Required

Scope

Unchanged

Changed

Confidentiality

None

Low

High

Integrity

None

Low

High

Availability

None

Low

High