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CVE-2018-3646

Published: 14 August 2018

Systems with microprocessors utilizing speculative execution and address translations may allow unauthorized disclosure of information residing in the L1 data cache to an attacker with local user access with guest OS privilege via a terminal page fault and a side-channel analysis.

From the Ubuntu security team

It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS).

Notes

AuthorNote
tyhicks
A microcode update will be provided to allow the kernel to flush the
L1D cache on VM entry. However, the kernel has a software fallback mechanism
in place when microcode updates are not available/installed.
The break-fix lines for this CVE are not complete since a large
number of patches are required to mitigate this issue. The commit(s) listed
are chosen as placeholders for automated CVE triage purposes.
Priority

High

CVSS 3 base score: 5.6

Status

Package Release Status
intel-microcode
Launchpad, Ubuntu, Debian
bionic
Released (3.20180807a.0ubuntu0.18.04.1)
cosmic Not vulnerable
(3.20180807a.1)
precise Does not exist

trusty
Released (3.20180807a.0ubuntu0.14.04.1)
upstream Needed

xenial
Released (3.20180807a.0ubuntu0.16.04.1)
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-32.35)
cosmic Not vulnerable
(4.17.0-9.10)
precise
Released (3.2.0-137.183)
trusty
Released (3.13.0-155.205)
upstream
Released (4.19~rc1)
xenial
Released (4.4.0-133.159)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by c595ceee45707f00f64f61c54fb64ef0cc0b4e85|local-2018-3646-fix
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1019.19)
cosmic Not vulnerable
(4.15.0-1020.20)
precise Does not exist

trusty
Released (4.4.0-1027.30)
upstream
Released (4.19~rc1)
xenial
Released (4.4.0-1065.75)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Not vulnerable
(4.15.0-1030.31~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1021.21)
cosmic Not vulnerable
(4.15.0-1023.24)
precise Does not exist

trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
upstream
Released (4.19~rc1)
xenial
Released (4.15.0-1021.21~16.04.1)
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1021.21)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.15.0-1021.21~16.04.1)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Ignored
(supported use cases do not include executing untrusted code)
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream Not vulnerable
(ARM is not affected)
xenial Ignored
(abandoned)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1017.18)
cosmic Not vulnerable
(4.15.0-1018.19)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.15.0-1017.18~16.04.1)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-1004.5~18.04.1)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

linux-gke
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Ignored
(was needs-triage now end-of-life)
linux-goldfish
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc1)
xenial Ignored
(was needed now end-of-life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream Not vulnerable
(ARM is not affected)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-13.14~18.04.1)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.15.0-32.35~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-12.13~18.04.1)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.15.0-32.35~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1019.19)
cosmic Not vulnerable
(4.15.0-1020.20)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.4.0-1031.37)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise
Released (3.13.0-155.206~precise1)
trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

linux-lts-utopic
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [out of standard support])
upstream
Released (4.19~rc1)
xenial Does not exist

linux-lts-vivid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [out of standard support])
upstream
Released (4.19~rc1)
xenial Does not exist

linux-lts-wily
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [out of standard support])
upstream
Released (4.19~rc1)
xenial Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty
Released (4.4.0-133.159~14.04.1)
upstream
Released (4.19~rc1)
xenial Does not exist

linux-maguro
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream Not vulnerable
(ARM is not affected)
xenial Does not exist

linux-mako
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream Not vulnerable
(ARM is not affected)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream Not vulnerable
(ARM is not affected)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1015.18)
cosmic Not vulnerable
(4.15.0-1017.20)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Ignored
(was needed now end-of-life)
linux-oracle
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1007.9)
cosmic Not vulnerable

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Not vulnerable
(4.15.0-1007.9~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(ARM is not affected)
cosmic Not vulnerable
(ARM is not affected)
precise Does not exist

trusty Does not exist

upstream Not vulnerable
(ARM is not affected)
xenial Not vulnerable
(ARM is not affected)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Not vulnerable

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream Not vulnerable
(ARM is not affected)
xenial Not vulnerable
(ARM is not affected)