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CVE-2019-19965

Published: 25 December 2019

In the Linux kernel through 5.4.6, there is a NULL pointer dereference in drivers/scsi/libsas/sas_discover.c because of mishandling of port disconnection during discovery, related to a PHY down race condition, aka CID-f70267f379b5.

From the Ubuntu Security Team

Gao Chuan discovered that the SAS Class driver in the Linux kernel contained a race condition that could lead to a NULL pointer dereference. A local attacker could possibly use this to cause a denial of service (system crash).

Priority

Medium

Cvss 3 Severity Score

4.7

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1060.62)
disco Ignored
(end of life)
eoan
Released (5.3.0-1011.12)
focal Not vulnerable
(5.4.0-1005.5)
trusty
Released (4.4.0-1062.66)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.5~rc2)
xenial
Released (4.4.0-1102.113)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1025.28)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1012.13~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

xenial Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
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 (5.5~rc2)
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

trusty Does not exist

upstream
Released (5.5~rc2)
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 (5.5~rc2)
xenial Does not exist

linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-88.88)
disco Ignored
(end of life)
eoan
Released (5.3.0-40.32)
focal Not vulnerable
(5.4.0-18.22)
trusty Ignored
(was needed ESM criteria)
upstream
Released (5.5~rc2)
xenial
Released (4.4.0-174.204)
Patches:
Introduced by

2908d778ab3e244900c310974e1fc1c69066e450

Fixed by f70267f379b5e5e11bdc5d72a56bf17e5feed01f
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 (5.5~rc2)
xenial
Released (4.15.0-1060.62~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1032.34)
disco Ignored
(end of life)
eoan
Released (5.3.0-1013.14)
focal Not vulnerable
(5.4.0-1006.6)
trusty
Released (4.15.0-1071.76~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.5~rc2)
xenial
Released (4.15.0-1071.76)
linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1013.14~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
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 (5.5~rc2)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1031.32)
disco Ignored
(end of life)
eoan
Released (5.3.0-1012.13)
focal Not vulnerable
(5.4.0-1005.5)
trusty Does not exist

upstream
Released (5.5~rc2)
xenial
Released (4.15.0-1055.59)
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 (5.5~rc2)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1052.55)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1030.31)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1012.13~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-40.32~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
xenial
Released (4.15.0-88.88~16.04.1)
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 (5.5~rc2)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1053.53)
disco Ignored
(end of life)
eoan
Released (5.3.0-1010.11)
focal Not vulnerable
(5.4.0-1004.4)
trusty Does not exist

upstream
Released (5.5~rc2)
xenial
Released (4.4.0-1066.73)
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 (5.5~rc2)
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 (4.4.0-174.204~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.5~rc2)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1073.83)
disco Ignored
(end of life)
eoan Ignored
(end of life, was pending)
focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
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 (5.5~rc2)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1039.44)
disco Ignored
(end of life)
eoan Ignored
(end of life, was pending)
focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1033.36)
disco Ignored
(end of life)
eoan
Released (5.3.0-1009.10)
focal Not vulnerable
(5.4.0-1005.5)
trusty Does not exist

upstream
Released (5.5~rc2)
xenial
Released (4.15.0-1033.36~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1011.16)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
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 (5.5~rc2)
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 (5.5~rc2)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1055.59)
disco Ignored
(end of life)
eoan
Released (5.3.0-1018.20)
focal Ignored
(end of life, was needed)
trusty Does not exist

upstream
Released (5.5~rc2)
xenial
Released (4.4.0-1129.138)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1018.20~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
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 (5.5~rc2)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1072.79)
disco Ignored
(end of life)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc2)
xenial
Released (4.4.0-1133.141)

Severity score breakdown

Parameter Value
Base score 4.7
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H