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CVE-2019-20422

Published: 27 January 2020

In the Linux kernel before 5.3.4, fib6_rule_lookup in net/ipv6/ip6_fib.c mishandles the RT6_LOOKUP_F_DST_NOREF flag in a reference-count decision, leading to (for example) a crash that was identified by syzkaller, aka CID-7b09c2d052db.

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Not vulnerable
(3.11.0-12.19)
xenial Not vulnerable
(4.2.0-16.19)
bionic Not vulnerable
(4.13.0-16.19)
eoan
Released (5.3.0-22.24)
Patches:
Introduced by

d64a1f574a2957b4bcb06452d36cc1c6bf16e9fc

Fixed by 7b09c2d052db4b4ad0b27b97918b46a7746966fa
linux-hwe
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Does not exist

xenial Not vulnerable
(4.8.0-36.36~16.04.1)
bionic Not vulnerable
(4.18.0-13.14~18.04.1)
eoan Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Does not exist

xenial Ignored
(end of life, was needs-triage)
bionic Ignored
(end of life, was needs-triage)
eoan Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Not vulnerable
(4.4.0-13.29~14.04.1)
xenial Does not exist

bionic Does not exist

eoan Does not exist

linux-lts-trusty
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Does not exist

xenial Does not exist

bionic Does not exist

eoan Does not exist

linux-oem
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Does not exist

xenial Ignored
(end of standard support, was needs-triage)
bionic Not vulnerable
(4.15.0-1002.3)
eoan Not vulnerable
(4.15.0-1035.40)
linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1010.11)
eoan Not vulnerable
(5.0.0-1010.11)
trusty Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Does not exist

xenial Not vulnerable
(4.4.0-1004.9)
bionic Not vulnerable
(4.15.0-1002.2)
eoan
Released (5.3.0-1007.8)
linux-aws
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Not vulnerable
(4.4.0-1002.2)
xenial Not vulnerable
(4.4.0-1001.10)
bionic Not vulnerable
(4.15.0-1001.1)
eoan
Released (5.3.0-1007.8)
linux-aws-5.0
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(5.0.0-1021.24~18.04.1)
eoan Does not exist

linux-aws-hwe
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Does not exist

xenial Not vulnerable
(4.15.0-1030.31~16.04.1)
bionic Does not exist

eoan Does not exist

linux-azure
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
xenial Not vulnerable
(4.11.0-1009.9)
bionic Not vulnerable
(4.15.0-1002.2)
eoan
Released (5.3.0-1007.8)
linux-azure-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Not vulnerable
(5.3.0-1007.8~18.04.1)
eoan Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(5.0.0-1011.11~18.04.1)
eoan Does not exist

upstream
Released (5.4~rc1)
linux-oem-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Does not exist

eoan Does not exist

upstream
Released (5.4~rc1)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
upstream
Released (5.4~rc1)
trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(5.3.0-1011.12~18.04.1)
eoan Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Ignored
(end of standard support, was needs-triage)
linux-gcp
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1001.1)
eoan
Released (5.3.0-1008.9)
trusty Does not exist

upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.10.0-1004.4)
linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1008.9~18.04.1)
eoan 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)
eoan 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)
eoan 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)
eoan
Released (5.3.0-1006.7)
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 Not vulnerable
(5.0.0-1007.12~18.04.1)
eoan Does not exist

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)
eoan
Released (5.3.0-1012.14)
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

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)
eoan Does not exist

trusty Does not exist

upstream
Released (5.4~rc1)
xenial Not vulnerable
(4.4.0-1012.12)

Severity score breakdown

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