CVE-2018-15572

Published: 19 August 2018

The spectre_v2_select_mitigation function in arch/x86/kernel/cpu/bugs.c in the Linux kernel before 4.18.1 does not always fill RSB upon a context switch, which makes it easier for attackers to conduct userspace-userspace spectreRSB attacks.

From the Ubuntu security team

It was discovered that microprocessors utilizing speculative execution and prediction of return addresses via Return Stack Buffer (RSB) may allow unauthorized memory reads via sidechannel attacks. An attacker could use this to expose sensitive information.

Priority

High

CVSS 3 base score: 6.5

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-36.39)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-137.163)
Ubuntu 14.04 ESM (Trusty Tahr) Not vulnerable
(3.11.0-12.19)
Patches:
Introduced by c995efd5a740d9cbafbf58bde4973e8b50b4d761
Fixed by fdf82a7856b32d905c39afc85e34364491e46346
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1023.23)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1069.79)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.4.0-1031.34)
linux-aws-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Not vulnerable
(4.15.0-1030.31~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-azure
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1025.26)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1025.26~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.15.0-1030.31~14.04.1)
linux-azure-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1025.26)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1025.26~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-euclid
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(supported use cases do not include executing untrusted code)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(abandoned)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-gcp
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1021.22)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1021.22~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.18.0-1004.5~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(end-of-life)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(end-of-life)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.18.0-13.14~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-36.39~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.18.0-12.13~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-36.39~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1023.23)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1035.41)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [out of standard support])
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [out of standard support])
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [out of standard support])
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.4.0-137.163~14.04.1)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(abandoned)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-oem
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1021.24)
Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(was needed now end-of-life)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.15.0-1007.9)
Ubuntu 16.04 ESM (Xenial Xerus) Not vulnerable
(4.15.0-1007.9~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1024.26)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1098.106)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable

Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1102.107)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist