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CVE-2019-19768

Published: 12 December 2019

In the Linux kernel 5.4.0-rc2, there is a use-after-free (read) in the __blk_add_trace function in kernel/trace/blktrace.c (which is used to fill out a blk_io_trace structure and place it in a per-cpu sub-buffer).

From the Ubuntu Security Team

Tristan Madani discovered that the block I/O tracing implementation in the Linux kernel contained a race condition. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1066.70)
disco Ignored
(end of life)
eoan
Released (5.3.0-1017.18)
focal Not vulnerable
(5.4.0-1007.7)
trusty
Released (4.4.0-1066.70)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.6~rc5)
xenial
Released (4.4.0-1106.117)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needed)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1017.18~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

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 (5.6~rc5)
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

xenial Does not exist

upstream
Released (5.6~rc5)
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-99.100)
disco Ignored
(end of life)
eoan
Released (5.3.0-51.44)
focal Not vulnerable
(5.4.0-21.25)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.6~rc5)
xenial
Released (4.4.0-178.208)
Patches:
Introduced by

2056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4

Fixed by c780e86dd48ef6467a1146cf7d0fe1e05a635039
Introduced by

c780e86dd48ef6467a1146cf7d0fe1e05a635039

Fixed by 153031a301bb07194e9c37466cfce8eacb977621
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 (5.6~rc5)
xenial
Released (4.15.0-1066.70~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needed)
disco Ignored
(end of life)
eoan
Released (5.3.0-1020.21)
focal Not vulnerable
(5.4.0-1008.8)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.6~rc5)
xenial
Released (4.15.0-1082.92~16.04.1)
linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1020.21~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
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 (5.6~rc5)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needed)
disco Ignored
(end of life)
eoan
Released (5.3.0-1018.19)
focal Not vulnerable
(5.4.0-1007.7)
trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.15.0-1061.65)
linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1018.19~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
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 (5.6~rc5)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1058.61)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1035.36)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1018.19~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-51.44~18.04.2)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.15.0-99.100~16.04.1)
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 (5.6~rc5)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1059.60)
disco Ignored
(end of life)
eoan
Released (5.3.0-1016.17)
focal Not vulnerable
(5.4.0-1006.6)
trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.4.0-1070.77)
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 (5.6~rc5)
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
Released (4.4.0-178.208~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.6~rc5)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1080.90)
disco Ignored
(end of life)
eoan Ignored
(end of life, was pending)
focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
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 (5.6~rc5)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1050.55)
disco Ignored
(end of life)
eoan Ignored
(end of life, was pending)
focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1038.42)
disco Ignored
(end of life)
eoan
Released (5.3.0-1016.18)
focal Not vulnerable
(5.4.0-1007.7)
trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.15.0-1038.42~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needed)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1016.18~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
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 (5.6~rc5)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1061.65)
disco Ignored
(end of life)
eoan
Released (5.3.0-1023.25)
focal Ignored
(end of life, was needs-triage)
trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.4.0-1132.141)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1023.25~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
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 (5.6~rc5)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1077.84)
disco Ignored
(end of life)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.4.0-1136.144)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H