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
Author | Note |
---|---|
tyhicks |
Exploiting this vulnerability requires a crafted filesystem image to be mounted |
Mitigation
| sudo sysctl kernel.dmesg_restrict=1
Priority
Status
Package | Release | Status |
---|---|---|
linux
Launchpad, Ubuntu, Debian |
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)
|
|
groovy |
Not vulnerable
(5.4.0-42.46)
|
|
hirsute |
Not vulnerable
(5.8.0-36.40+21.04.1)
|
|
trusty |
Ignored
(was needs-triage ESM criteria)
|
|
upstream |
Released
(5.7~rc1)
|
|
xenial |
Ignored
(end of life, was needed)
|
|
Patches:
Introduced by
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
|
||
linux-aws
Launchpad, Ubuntu, Debian |
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)
|
|
groovy |
Not vulnerable
(5.4.0-1020.20)
|
|
hirsute |
Not vulnerable
(5.8.0-1018.20+21.04.1)
|
|
trusty |
Ignored
(was needs-triage ESM criteria)
|
|
upstream |
Released
(5.7~rc1)
|
|
xenial |
Ignored
(end of life, was needed)
|
|
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-5.3
Launchpad, Ubuntu, Debian |
bionic |
Released
(5.3.0-1019.21~18.04.1)
|
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-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
Launchpad, Ubuntu, Debian |
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)
|
|
groovy |
Not vulnerable
(5.4.0-1022.22)
|
|
hirsute |
Not vulnerable
(5.8.0-1016.17+21.04.1)
|
|
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-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-dell300x
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1005.8)
|
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
Launchpad, Ubuntu, Debian |
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)
|
|
groovy |
Not vulnerable
(5.4.0-1021.21)
|
|
hirsute |
Not vulnerable
(5.8.0-1015.15+21.04.1)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.7~rc1)
|
|
xenial |
Released
(4.15.0-1080.90~16.04.1)
|
|
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-5.0
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-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-gke-5.4
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-1025.25~18.04.1)
|
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-gkeop
Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
focal |
Not vulnerable
(5.4.0-1008.9)
|
|
groovy |
Does not exist
|
|
hirsute |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.7~rc1)
|
|
xenial |
Does not exist
|
|
linux-gkeop-5.4
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-1001.1)
|
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
Launchpad, Ubuntu, Debian |
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)
|
|
xenial |
Released
(4.15.0-112.113~16.04.1)
|
|
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-5.8
Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
focal |
Not vulnerable
(5.8.0-23.24~20.04.1)
|
|
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-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-oracle
Launchpad, Ubuntu, Debian |
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)
|
|
groovy |
Not vulnerable
(5.4.0-1021.21)
|
|
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-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 |