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CVE-2020-15436

Published: 23 November 2020

Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8 allows local users to gain privileges or cause a denial of service by leveraging improper access to a certain error field.

From the Ubuntu Security Team

It was discovered that the block layer implementation in the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash).

Priority

Medium

Cvss 3 Severity Score

6.7

Score breakdown

Status

Package Release Status
linux-aws-5.0
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Ignored
(superseded by linux-aws-5.3)
focal Does not exist

groovy Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-aws-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

bionic
Released (5.4.0-1022.22~18.04.1)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
groovy Does not exist

bionic
Released (4.15.0-1068.72)
focal Ignored
(replaced by linux-raspi)
trusty Does not exist

upstream
Released (5.8~rc2)
xenial
Released (4.4.0-1137.146)
linux-riscv
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (5.4.0-31.35)
groovy Not vulnerable
(5.8.0-1.1)
trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
groovy Not vulnerable
(5.8.0-1002.2)
bionic Ignored
(superseded by linux-gcp-5.3)
focal
Released (5.4.0-1022.22)
trusty Does not exist

upstream
Released (5.8~rc2)
xenial
Released (4.15.0-1081.92~16.04.1)
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-115.116)
focal
Released (5.4.0-45.49)
xenial
Released (4.4.0-187.217)
groovy Not vulnerable
(5.8.0-16.17)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc2)
Patches:
Introduced by

77ea887e433ad8389d416826936c110fa7910f80

Fixed by 2d3a8e2deddea6c89961c422ec0c5b851e648c14
linux-aws
Launchpad, Ubuntu, Debian
focal
Released (5.4.0-1022.22)
xenial
Released (4.4.0-1112.124)
bionic
Released (4.15.0-1080.84)
groovy Not vulnerable
(5.8.0-1004.4)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc2)
linux-aws-hwe
Launchpad, Ubuntu, Debian
xenial
Released (4.15.0-1080.84~16.04.1)
bionic Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
linux-azure
Launchpad, Ubuntu, Debian
focal
Released (5.4.0-1023.23)
xenial
Released (4.15.0-1093.103~16.04.1)
bionic Ignored
(superseded by linux-azure-5.3)
groovy Not vulnerable
(5.8.0-1004.4)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc2)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1093.103)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1023.23~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-gke-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

trusty Does not exist

xenial Does not exist

groovy Does not exist

bionic Not vulnerable
(5.4.0-1025.25~18.04.1)
upstream
Released (5.8~rc2)
linux-hwe-5.8
Launchpad, Ubuntu, Debian
bionic Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

focal Not vulnerable
(5.8.0-23.24~20.04.1)
upstream
Released (5.8~rc2)
linux-gkeop-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(5.4.0-1001.1)
upstream
Released (5.8~rc2)
linux-dell300x
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1005.8)
upstream
Released (5.8~rc2)
focal Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

linux-gkeop
Launchpad, Ubuntu, Debian
focal Not vulnerable
(5.4.0-1008.9)
bionic Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-aws-5.4)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic
Released (4.15.0-1072.73)
focal
Released (5.4.0-1021.21)
groovy Not vulnerable
(5.8.0-1001.1)
upstream
Released (5.8~rc2)
xenial
Released (4.4.0-1078.85)
linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.4)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.3)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1081.92)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.4)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1022.22~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.3)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1067.70)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1046.47)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1033.35)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic Ignored
(replaced by linux-hwe-5.4)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial
Released (4.15.0-115.116~16.04.1)
linux-hwe-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-45.49~18.04.2)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-hwe-5.4)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Ignored
(superseded by linux-hwe)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

groovy Does not exist

trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc2)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1094.104)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Ignored
(end of standard support)
linux-oem-5.10
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Not vulnerable
(5.10.0-1008.9)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-oem-5.6
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (5.6.0-1048.52)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic Ignored
(end of standard support, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1051.55)
focal
Released (5.4.0-1022.22)
groovy Not vulnerable
(5.8.0-1001.1)
trusty Does not exist

upstream
Released (5.8~rc2)
xenial
Released (4.15.0-1051.55~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-oracle-5.3)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-oracle-5.4)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1022.22~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-raspi
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (5.4.0-1016.17)
groovy Not vulnerable
(5.4.0-1016.17)
trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-raspi-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1016.17~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1032.34)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1084.92)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc2)
xenial
Released (4.4.0-1141.149)

Severity score breakdown

Parameter Value
Base score 6.7
Attack vector Local
Attack complexity Low
Privileges required High
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H