CVE-2019-18198
Published: 17 October 2019
In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c, when handling the FIB_LOOKUP_NOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753.
From the Ubuntu Security Team
It was discovered that the IPv6 routing implementation in the Linux kernel contained a reference counting error leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
Notes
Author | Note |
---|---|
sbeattie | affects 5.3 kernels only |
Mitigation
disable unprivileged user namespaces if not needed via sudo sysctl kernel.unprivileged_userns_clone=0
Priority
Status
Package | Release | Status |
---|---|---|
linux Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.13.0-16.19)
|
disco |
Not vulnerable
(4.18.0-10.11)
|
|
eoan |
Released
(5.3.0-19.20)
|
|
trusty |
Not vulnerable
(3.11.0-12.19)
|
|
upstream |
Released
(5.4~rc1)
|
|
xenial |
Not vulnerable
(4.2.0-16.19)
|
|
Patches: Introduced by 7d9e5f422150ed00de744e02a80734d74cc9704d |
||
linux-aws Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1001.1)
|
disco |
Not vulnerable
(4.18.0-1002.3)
|
|
eoan |
Released
(5.3.0-1004.4)
|
|
trusty |
Not vulnerable
(4.4.0-1002.2)
|
|
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
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.4~rc1)
|
|
xenial |
Not vulnerable
(4.15.0-1030.31~16.04.1)
|
|
linux-aws-5.0 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.0.0-1021.24~18.04.1)
|
disco |
Does not exist
|
|
eoan |
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)
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.4~rc1)
|
|
xenial |
Does not exist
|
|
linux-azure Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1002.2)
|
disco |
Not vulnerable
(4.18.0-1003.3)
|
|
eoan |
Released
(5.3.0-1004.4)
|
|
trusty |
Not vulnerable
(4.15.0-1023.24~14.04.1)
|
|
upstream |
Released
(5.4~rc1)
|
|
xenial |
Not vulnerable
(4.11.0-1009.9)
|
|
linux-azure-edge Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1002.2)
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.4~rc1)
|
|
xenial |
Not vulnerable
(4.11.0-1009.9)
|
|
linux-gcp Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1001.1)
|
disco |
Not vulnerable
(4.18.0-1002.3)
|
|
eoan |
Released
(5.3.0-1005.5)
|
|
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)
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.4~rc1)
|
|
xenial |
Does not exist
|
|
linux-gcp-edge Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1001.1)
|
disco |
Does not exist
|
|
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)
|
disco |
Does not exist
|
|
eoan |
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
|
|
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
|
|
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 |
Not vulnerable
(5.0.0-15.16~18.04.1)
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.4~rc1)
|
|
xenial |
Not vulnerable
(4.8.0-36.36~16.04.1)
|
|
linux-kvm Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1002.2)
|
disco |
Not vulnerable
(4.18.0-1003.3)
|
|
eoan |
Released
(5.3.0-1004.4)
|
|
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
|
|
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
|
|
trusty |
Not vulnerable
(4.4.0-13.29~14.04.1)
|
|
upstream |
Released
(5.4~rc1)
|
|
xenial |
Does not exist
|
|
linux-oem Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1002.3)
|
disco |
Not vulnerable
(4.15.0-1021.24)
|
|
eoan |
Not vulnerable
(4.15.0-1035.40)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.4~rc1)
|
|
xenial |
Not vulnerable
|
|
linux-oem-5.4 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
eoan |
Does not exist
|
|
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 |
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-oracle Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1007.9)
|
disco |
Not vulnerable
(4.15.0-1007.9)
|
|
eoan |
Released
(5.3.0-1003.3)
|
|
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)
|
disco |
Does not exist
|
|
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)
|
disco |
Not vulnerable
(4.18.0-1005.7)
|
|
eoan |
Released
(5.3.0-1008.9)
|
|
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)
|
disco |
Not vulnerable
(5.0.0-1010.10)
|
|
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 | 7.8 |
Attack vector | Local |
Attack complexity | Low |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity impact | High |
Availability impact | High |
Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |