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CVE-2019-19318

Published: 28 November 2019

In the Linux kernel 5.3.11, mounting a crafted btrfs image twice can cause an rwsem_down_write_slowpath use-after-free because (in rwsem_can_spin_on_owner in kernel/locking/rwsem.c) rwsem_owner_flags returns an already freed pointer,

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
possibly fixed by btrfs tree checker, which would mean it's
addressed for all kernels 4.4.x and newer.

Priority

Low

Cvss 3 Severity Score

4.4

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.13.0-16.19)
disco Ignored
(end of life)
eoan
Released (5.3.0-22.24)
focal Not vulnerable
(5.4.0-9.12)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.2.0-16.19)
Patches:
Introduced by

78134300579a45f527ca173ec8fdb4701b69f16e

Fixed by 9f7fec0ba89108b9385f1b9fb167861224912a4a
linux-aws-5.0
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

xenial Does not exist

linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Ignored
(end of life)
eoan
Released (5.3.0-1007.8)
focal Not vulnerable
(5.4.0-1006.6)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.11.0-1009.9)
linux-gcp
Launchpad, Ubuntu, Debian
trusty Does not exist

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)
upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.10.0-1004.4)
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

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-aws
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1001.1)
disco Ignored
(end of life)
eoan
Released (5.3.0-1007.8)
focal Not vulnerable
(5.4.0-1005.5)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.4.0-1001.10)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.15.0-1030.31~16.04.1)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1082.92)
eoan Does not exist

focal 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

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

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1071.81)
eoan Does not exist

focal 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

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

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1030.32)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1011.11~18.04.1)
disco Does not exist

eoan Does not exist

focal 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

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-13.14~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.8.0-36.36~16.04.1)
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

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.2)
disco Ignored
(end of life)
eoan
Released (5.3.0-1007.8)
focal Not vulnerable
(5.4.0-1004.4)
trusty Does not exist

upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.4.0-1004.9)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.4~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

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

linux-oem
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.3)
disco Ignored
(end of life)
eoan Not vulnerable
(4.15.0-1035.40)
focal 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)
trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1010.11)
disco Ignored
(end of life)
eoan Not vulnerable
(5.0.0-1010.11)
focal Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1007.9)
disco Ignored
(end of life)
eoan
Released (5.3.0-1006.7)
focal Not vulnerable
(5.4.0-1005.5)
trusty Does not exist

upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.15.0-1007.9~16.04.1)
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

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

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)
trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.13.0-1005.5)
disco Ignored
(end of life)
eoan
Released (5.3.0-1012.14)
focal Ignored
(end of life, was needs-triage)
trusty Does not exist

upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.2.0-1013.19)
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

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

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

eoan Does not exist

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

upstream
Released (5.4~rc1)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.4.0-1077.82)
disco Ignored
(end of life)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.4.0-1013.15)

Severity score breakdown

Parameter Value
Base score 4.4
Attack vector Local
Attack complexity Low
Privileges required High
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H