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CVE-2019-19036

Published: 21 November 2019

btrfs_root_node in fs/btrfs/ctree.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because rcu_dereference(root->node) can be zero.

From the Ubuntu Security Team

It was discovered that the btrfs file system implementation in the Linux kernel did not properly validate file system metadata in some situations. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service (system crash).

Notes

AuthorNote
tyhicks
Exploiting this vulnerability requires a crafted filesystem image to
be mounted
sbeattie
likely addressed by the btrfs write time tree-checker, which
would mean it is addressed for kernels back through 4.4.x

Priority

Low

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
linux-hwe
Launchpad, Ubuntu, Debian
hirsute Does not exist

bionic
Released (5.3.0-26.28~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial
Released (4.15.0-112.113~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
hirsute Does not exist

bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Ignored
(end of life, was needs-triage)
linux-lts-trusty
Launchpad, Ubuntu, Debian
hirsute Does not exist

bionic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

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

bionic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.4~rc1)
xenial Does not exist

linux-aws
Launchpad, Ubuntu, Debian
hirsute Not vulnerable
(5.8.0-1018.20+21.04.1)
focal Not vulnerable
(5.4.0-1005.5)
xenial Ignored
(end of life, was needed)
bionic
Released (4.15.0-1077.81)
disco Ignored
(end of life)
eoan
Released (5.3.0-1007.8)
groovy Not vulnerable
(5.4.0-1009.9)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.4~rc1)
linux-aws-5.4
Launchpad, Ubuntu, Debian
hirsute Does not exist

bionic Not vulnerable
(5.4.0-1018.18~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-riscv
Launchpad, Ubuntu, Debian
hirsute Not vulnerable
(5.8.0-10.12+21.04.1)
bionic Does not exist

eoan Does not exist

focal Not vulnerable
(5.4.0-24.28)
groovy Not vulnerable
(5.4.0-24.28)
trusty Does not exist

upstream
Released (5.4~rc1)
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

hirsute Does not exist

bionic Not vulnerable
(5.4.0-1025.25~18.04.1)
upstream
Released (5.4~rc1)
linux-hwe-5.8
Launchpad, Ubuntu, Debian
bionic Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

xenial Does not exist

focal Not vulnerable
(5.8.0-23.24~20.04.1)
upstream
Released (5.4~rc1)
linux-gkeop-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

trusty Does not exist

xenial Does not exist

groovy Does not exist

hirsute Does not exist

bionic Not vulnerable
(5.4.0-1001.1)
upstream
Released (5.4~rc1)
linux-azure
Launchpad, Ubuntu, Debian
focal Not vulnerable
(5.4.0-1006.6)
hirsute Not vulnerable
(5.8.0-1016.17+21.04.1)
bionic Ignored
(end of life, was needs-triage)
disco Ignored
(end of life)
eoan
Released (5.3.0-1007.8)
groovy Not vulnerable
(5.4.0-1010.10)
trusty
Released (4.15.0-1091.101~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.4~rc1)
xenial
Released (4.15.0-1091.101~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
focal Not vulnerable
(5.4.0-1004.4)
xenial Ignored
(end of life, was needed)
trusty Does not exist

upstream
Released (5.4~rc1)
bionic
Released (4.15.0-1069.70)
disco Ignored
(end of life)
eoan
Released (5.3.0-1007.8)
groovy Not vulnerable
(5.4.0-1009.9)
hirsute Not vulnerable
(5.8.0-1010.11+21.04.1)
linux-gcp
Launchpad, Ubuntu, Debian
hirsute Not vulnerable
(5.8.0-1015.15+21.04.1)
bionic Ignored
(end of life, was needs-triage)
disco Ignored
(end of life)
eoan
Released (5.3.0-1008.9)
focal Not vulnerable
(5.4.0-1005.5)
groovy Not vulnerable
(5.4.0-1009.9)
trusty Does not exist

upstream
Released (5.4~rc1)
xenial
Released (4.15.0-1080.90~16.04.1)
linux-oracle
Launchpad, Ubuntu, Debian
hirsute Not vulnerable
(5.8.0-1014.14+21.04.1)
bionic
Released (4.15.0-1048.52)
disco Ignored
(end of life)
eoan
Released (5.3.0-1006.7)
focal Not vulnerable
(5.4.0-1005.5)
groovy Not vulnerable
(5.4.0-1009.9)
trusty Does not exist

upstream
Released (5.4~rc1)
xenial
Released (4.15.0-1050.54~16.04.1)
linux
Launchpad, Ubuntu, Debian
hirsute Not vulnerable
(5.8.0-36.40+21.04.1)
xenial Ignored
(end of life, was needed)
bionic
Released (4.15.0-109.110)
disco Ignored
(end of life)
eoan
Released (5.3.0-22.24)
focal Not vulnerable
(5.4.0-9.12)
groovy Not vulnerable
(5.4.0-26.30)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.4~rc1)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by 62fdaa52a3d00a875da771719b6dc537ca79fce1
linux-dell300x
Launchpad, Ubuntu, Debian
focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(4.15.0-1005.8)
upstream
Released (5.4~rc1)
linux-oem-5.10
Launchpad, Ubuntu, Debian
bionic Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

xenial Does not exist

focal Not vulnerable
(5.10.0-1008.9)
upstream
Released (5.4~rc1)
linux-gkeop
Launchpad, Ubuntu, Debian
bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal Not vulnerable
(5.4.0-1008.9)
upstream
Released (5.4~rc1)
trusty Does not exist

xenial Does not exist

linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1080.90)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-hwe-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-37.41~18.04.1)
upstream
Released (5.4~rc1)
focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1065.70)
disco Ignored
(end of life)
eoan Ignored
(end of life)
focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-raspi-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1013.13~18.04.1)
upstream
Released (5.4~rc1)
focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1083.91)
xenial Ignored
(end of standard support, was needed)
disco Ignored
(end of life)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
linux-oracle-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

upstream
Released (5.4~rc1)
bionic Not vulnerable
(5.4.0-1019.19~18.04.1)
focal Does not exist

groovy Does not exist

hirsute Does not exist

xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
xenial Ignored
(end of standard support, was needed)
bionic
Released (4.15.0-1065.69)
disco Ignored
(end of life)
eoan
Released (5.3.0-1012.14)
focal Ignored
(end of life, was needs-triage)
groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1016.17~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial
Released (4.15.0-1079.83~16.04.1)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1091.101)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1007.8~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1020.20~18.04.1)
focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1008.9~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1019.19~18.04.2)
focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1066.69)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1045.46)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1011.12~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1091.101)
disco Ignored
(end of life)
eoan Ignored
(end of life)
focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Ignored
(end of standard support, was needs-triage)
linux-oem-5.6
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Not vulnerable
(5.6.0-1007.7)
groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1011.12~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

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

eoan Does not exist

focal Not vulnerable
(5.4.0-1007.7)
groovy Not vulnerable
(5.4.0-1008.8)
hirsute Not vulnerable
(5.8.0-1008.11+21.04.1)
trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1017.19~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H