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CVE-2019-19039

Published: 21 November 2019

** DISPUTED ** __btrfs_free_extent in fs/btrfs/extent-tree.c in the Linux kernel through 5.3.12 calls btrfs_print_leaf in a certain ENOENT case, which allows local users to obtain potentially sensitive information about register values via the dmesg program. NOTE: The BTRFS development team disputes this issues as not being a vulnerability because “1) The kernel provide facilities to restrict access to dmesg - dmesg_restrict=1 sysctl option. So it's really up to the system administrator to judge whether dmesg access shall be disallowed or not. 2) WARN/WARN_ON are widely used macros in the linux kernel. If this CVE is considered valid this would mean there are literally thousands CVE lurking in the kernel - something which clearly is not the case.”

From the Ubuntu Security Team

It was discovered that the btrfs file system in the Linux kernel in some error conditions could report register information to the dmesg buffer. A local attacker could possibly use this to expose sensitive information.

Notes

AuthorNote
tyhicks
Exploiting this vulnerability requires a crafted filesystem image to
be mounted

Mitigation

| sudo sysctl kernel.dmesg_restrict=1

Priority

Negligible

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
linux-aws-5.3
Launchpad, Ubuntu, Debian
hirsute Does not exist

bionic
Released (5.3.0-1019.21~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic Ignored
(end of standard support, was needed)
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 (5.7~rc1)
xenial Does not exist

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

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Not vulnerable
(5.4.0-1025.25~18.04.1)
upstream
Released (5.7~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 (5.7~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 (5.7~rc1)
linux-azure
Launchpad, Ubuntu, Debian
hirsute Not vulnerable
(5.8.0-1016.17+21.04.1)
groovy Not vulnerable
(5.4.0-1022.22)
bionic Ignored
(end of life, was needs-triage)
disco Ignored
(end of life)
eoan
Released (5.3.0-1022.23)
focal
Released (5.4.0-1012.12)
trusty
Released (4.15.0-1091.101~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.7~rc1)
xenial
Released (4.15.0-1091.101~16.04.1)
linux-gcp
Launchpad, Ubuntu, Debian
hirsute Not vulnerable
(5.8.0-1015.15+21.04.1)
groovy Not vulnerable
(5.4.0-1021.21)
bionic Ignored
(end of life, was needs-triage)
disco Ignored
(end of life)
eoan
Released (5.3.0-1020.22)
focal
Released (5.4.0-1011.11)
trusty Does not exist

upstream
Released (5.7~rc1)
xenial
Released (4.15.0-1080.90~16.04.1)
linux
Launchpad, Ubuntu, Debian
hirsute Not vulnerable
(5.8.0-36.40+21.04.1)
groovy Not vulnerable
(5.4.0-42.46)
xenial Ignored
(end of life, was needed)
bionic
Released (4.15.0-109.110)
disco Ignored
(end of life)
eoan
Released (5.3.0-53.47)
focal
Released (5.4.0-31.35)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.7~rc1)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by b3ff8f1d380e65dddd772542aa9bff6c86bf715a
linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of standard support, was needed)
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 (5.7~rc1)
xenial Does not exist

linux-dell300x
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1005.8)
upstream
Released (5.7~rc1)
focal Does not exist

groovy Does not exist

hirsute 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

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-aws
Launchpad, Ubuntu, Debian
groovy Not vulnerable
(5.4.0-1020.20)
xenial Ignored
(end of life, was needed)
bionic
Released (4.15.0-1077.81)
disco Ignored
(end of life)
eoan
Released (5.3.0-1019.21)
focal
Released (5.4.0-1011.11)
hirsute Not vulnerable
(5.8.0-1018.20+21.04.1)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.7~rc1)
linux-hwe
Launchpad, Ubuntu, Debian
xenial
Released (4.15.0-112.113~16.04.1)
bionic
Released (5.3.0-53.47~18.04.1)
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 (5.7~rc1)
linux-oracle
Launchpad, Ubuntu, Debian
groovy Not vulnerable
(5.4.0-1021.21)
bionic
Released (4.15.0-1048.52)
disco Ignored
(end of life)
eoan
Released (5.3.0-1018.20)
focal
Released (5.4.0-1011.11)
hirsute Not vulnerable
(5.8.0-1014.14+21.04.1)
trusty Does not exist

upstream
Released (5.7~rc1)
xenial
Released (4.15.0-1050.54~16.04.1)
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 (5.7~rc1)
xenial Does not exist

linux-aws-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1018.18~18.04.1)
focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~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 (5.7~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 (5.7~rc1)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1022.23~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~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 (5.7~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 (5.7~rc1)
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 (5.7~rc1)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1020.22~18.04.1)
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 (5.7~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 (5.7~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 (5.7~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 (5.7~rc1)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1020.22~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-hwe-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 (5.7~rc1)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1069.70)
disco Ignored
(end of life)
eoan
Released (5.3.0-1017.19)
focal
Released (5.4.0-1011.11)
groovy Not vulnerable
(5.4.0-1015.15)
hirsute Not vulnerable
(5.8.0-1010.11+21.04.1)
trusty Does not exist

upstream
Released (5.7~rc1)
xenial Ignored
(end of life, was needed)
linux-lts-trusty
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 (5.7~rc1)
xenial Does not exist

linux-lts-xenial
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 Ignored
(was needs-triage ESM criteria)
upstream
Released (5.7~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 (5.7~rc1)
xenial Ignored
(end of standard support, was needs-triage)
linux-oem-5.10
Launchpad, Ubuntu, Debian
bionic Does not exist

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

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.6.0-1010.10)
groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~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 (5.7~rc1)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1018.20~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1019.19~18.04.1)
focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.4.0-1011.11)
groovy Not vulnerable
(5.4.0-1012.12)
hirsute Not vulnerable
(5.8.0-1008.11+21.04.1)
trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1065.69)
disco Ignored
(end of life)
eoan
Released (5.3.0-1025.27)
focal Ignored
(end of life, was needs-triage)
groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Ignored
(end of standard support, was needed)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1026.28~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.4.0-26.30)
groovy Not vulnerable
(5.4.0-27.31)
hirsute Not vulnerable
(5.8.0-10.12+21.04.1)
trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1083.91)
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 (5.7~rc1)
xenial Ignored
(end of standard support, was needed)

Severity score breakdown

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