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
| Author | Note |
|---|---|
| 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
Status
| Package | Release | Status |
|---|---|---|
|
intel-microcode Launchpad, Ubuntu, Debian |
bionic |
Released
(3.20180807a.0ubuntu0.18.04.1)
|
| cosmic |
Not vulnerable
(3.20180807a.1)
|
|
| 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)
|
|
| trusty |
Released
(3.13.0-155.205)
|
|
| upstream |
Released
(4.19~rc1)
|
|
| xenial |
Released
(4.4.0-133.159)
|
|
|
Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 |
||
|
linux-aws Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1019.19)
|
| cosmic |
Not vulnerable
(4.15.0-1020.20)
|
|
| 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
|
|
| 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)
|
|
| 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
|
|
| 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
|
|
| 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
|
|
| 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)
|
|
| 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
|
|
| 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
|
|
| 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
|
|
| 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
|
|
| 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
|
|
| 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
|
|
| 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)
|
|
| 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
|
|
| 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
|
|
| 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
|
|
| 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
|
|
| 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
|
|
| 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
|
|
| 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
|
|
| 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
|
|
| 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)
|
|
| 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
|
|
| 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)
|
|
| 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
|
|
| trusty |
Does not exist
|
|
| upstream |
Not vulnerable
(ARM is not affected)
|
|
| xenial |
Not vulnerable
(ARM is not affected)
|
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.6 |
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Changed |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3646
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF
- https://ubuntu.com/security/notices/USN-3740-1
- https://ubuntu.com/security/notices/USN-3740-2
- https://ubuntu.com/security/notices/USN-3741-1
- https://ubuntu.com/security/notices/USN-3741-2
- https://ubuntu.com/security/notices/USN-3742-1
- https://ubuntu.com/security/notices/USN-3742-2
- https://ubuntu.com/security/notices/USN-3756-1
- https://ubuntu.com/security/notices/USN-3823-1
- NVD
- Launchpad
- Debian