CVE-2018-18281
Published: 30 October 2018
Since Linux kernel version 3.2, the mremap() syscall performs TLB flushes after dropping pagetable locks. If a syscall such as ftruncate() removes entries from the pagetables of a task that is in the middle of mremap(), a stale TLB entry can remain for a short time that permits access to a physical page after it has been released back to the page allocator and reused. This is fixed in the following kernel versions: 4.9.135, 4.14.78, 4.18.16, 4.19.
From the Ubuntu Security Team
Jann Horn discovered that the mremap() system call in the Linux kernel did not properly flush the TLB when completing, potentially leaving access to a physical page after it has been released to the page allocator. A local attacker could use this to cause a denial of service (system crash), expose sensitive information, or possibly execute arbitrary code.
Priority
Status
Package | Release | Status |
---|---|---|
linux Launchpad, Ubuntu, Debian |
focal |
Not vulnerable
(5.4.0-9.12)
|
bionic |
Released
(4.15.0-44.47)
|
|
cosmic |
Released
(4.18.0-12.13)
|
|
disco |
Not vulnerable
(4.19.0-12.13)
|
|
eoan |
Not vulnerable
(5.0.0-13.14)
|
|
trusty |
Released
(3.13.0-165.215)
|
|
upstream |
Released
(4.19)
|
|
xenial |
Released
(4.4.0-142.168)
|
|
Patches: Introduced by 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 |
||
linux-aws Launchpad, Ubuntu, Debian |
focal |
Not vulnerable
(5.4.0-1005.5)
|
bionic |
Released
(4.15.0-1032.34)
|
|
cosmic |
Released
(4.18.0-1006.7)
|
|
disco |
Not vulnerable
(4.18.0-1006.7)
|
|
eoan |
Not vulnerable
(5.0.0-1004.4)
|
|
trusty |
Ignored
(was needed ESM criteria)
|
|
upstream |
Released
(4.19)
|
|
xenial |
Released
(4.4.0-1075.85)
|
|
linux-azure Launchpad, Ubuntu, Debian |
focal |
Not vulnerable
(5.4.0-1006.6)
|
bionic |
Released
(4.15.0-1037.39)
|
|
cosmic |
Released
(4.18.0-1006.6)
|
|
disco |
Not vulnerable
(4.18.0-1006.6)
|
|
eoan |
Not vulnerable
(5.0.0-1004.4)
|
|
trusty |
Released
(4.15.0-1037.39~14.04.2)
|
|
upstream |
Released
(4.19)
|
|
xenial |
Released
(4.15.0-1037.39~16.04.1)
|
|
linux-gcp Launchpad, Ubuntu, Debian |
focal |
Not vulnerable
(5.4.0-1005.5)
|
bionic |
Released
(4.15.0-1027.28)
|
|
cosmic |
Released
(4.18.0-1004.5)
|
|
disco |
Not vulnerable
(4.18.0-1004.5)
|
|
eoan |
Not vulnerable
(5.0.0-1004.4)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Released
(4.15.0-1027.28~16.04.1)
|
|
linux-kvm Launchpad, Ubuntu, Debian |
focal |
Not vulnerable
(5.4.0-1004.4)
|
bionic |
Released
(4.15.0-1029.29)
|
|
cosmic |
Released
(4.18.0-1005.5)
|
|
disco |
Not vulnerable
(4.18.0-1005.5)
|
|
eoan |
Not vulnerable
(5.0.0-1004.4)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Released
(4.4.0-1040.46)
|
|
linux-gke Launchpad, Ubuntu, Debian |
focal |
Not vulnerable
|
bionic |
Does not exist
|
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Ignored
(end of standard support)
|
|
linux-azure-5.4 Launchpad, Ubuntu, Debian |
upstream |
Released
(4.19)
|
bionic |
Not vulnerable
(5.4.0-1020.20~18.04.1)
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
xenial |
Does not exist
|
|
linux-hwe-5.4 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-37.41~18.04.1)
|
upstream |
Released
(4.19)
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
xenial |
Does not exist
|
|
linux-raspi-5.4 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-1013.13~18.04.1)
|
upstream |
Released
(4.19)
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
xenial |
Does not exist
|
|
linux-raspi2 Launchpad, Ubuntu, Debian |
xenial |
Released
(4.4.0-1103.111)
|
bionic |
Released
(4.15.0-1031.33)
|
|
cosmic |
Released
(4.18.0-1007.9)
|
|
disco |
Not vulnerable
(4.18.0-1009.11)
|
|
eoan |
Not vulnerable
(5.0.0-1006.6)
|
|
focal |
Not vulnerable
(5.4.0-1004.4)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
linux-snapdragon Launchpad, Ubuntu, Debian |
xenial |
Released
(4.4.0-1107.112)
|
bionic |
Released
(4.15.0-1053.57)
|
|
cosmic |
Does not exist
|
|
disco |
Not vulnerable
(5.0.0-1010.10)
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
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
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-aws-5.3 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.3.0-1016.17~18.04.1)
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-aws-hwe Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Released
(4.15.0-1032.34~16.04.1)
|
|
linux-azure-4.15 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1082.92)
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
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
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-azure-edge Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1037.39)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-euclid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Ignored
(was needed ESM criteria)
|
|
linux-flo Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(4.19)
|
|
xenial |
Ignored
(abandoned)
|
|
linux-gcp-4.15 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1071.81)
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
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
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-gcp-edge Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1027.28)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
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
|
|
focal |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
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
|
|
focal |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-gke-5.3 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.3.0-1011.12~18.04.1)
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-goldfish Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(4.19)
|
|
xenial |
Ignored
(end of life)
|
|
linux-grouper Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-hwe Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.18.0-13.14~18.04.1)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Released
(4.15.0-45.48~16.04.1)
|
|
linux-hwe-edge Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.0.0-15.16~18.04.1)
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Released
(4.15.0-45.48~16.04.1)
|
|
linux-lts-trusty Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-lts-utopic Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Ignored
(end of life, was ignored)
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-lts-vivid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Ignored
(end of life, was ignored)
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-lts-wily Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Ignored
(end of life, was ignored)
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-lts-xenial Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Ignored
(was needed ESM criteria)
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-maguro Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-mako Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(4.19)
|
|
xenial |
Ignored
(abandoned)
|
|
linux-manta Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
cosmic |
Does not exist
|
|
disco |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-oem Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1033.38)
|
cosmic |
Released
(4.15.0-1033.38)
|
|
disco |
Not vulnerable
(4.15.0-1033.38)
|
|
eoan |
Not vulnerable
(4.15.0-1035.40)
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Ignored
(end of standard support, was needs-triage)
|
|
linux-oem-5.6 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
eoan |
Does not exist
|
|
focal |
Not vulnerable
(5.6.0-1007.7)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
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)
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-oracle Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1008.10)
|
cosmic |
Released
(4.15.0-1008.10)
|
|
disco |
Not vulnerable
(4.15.0-1008.10)
|
|
eoan |
Not vulnerable
(4.15.0-1011.13)
|
|
focal |
Not vulnerable
(5.4.0-1005.5)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Released
(4.15.0-1008.10~16.04.1)
|
|
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
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-oracle-5.3 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.3.0-1011.12~18.04.1)
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-raspi Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
eoan |
Does not exist
|
|
focal |
Not vulnerable
(5.4.0-1007.7)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-raspi2-5.3 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.3.0-1017.19~18.04.1)
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
|
linux-riscv Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
eoan |
Does not exist
|
|
focal |
Not vulnerable
(5.4.0-24.28)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(4.19)
|
|
xenial |
Does not exist
|
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:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18281
- https://git.kernel.org/linus/eb66ae030829605d61fbef1909ce310e29f78821
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1695
- https://ubuntu.com/security/notices/USN-3832-1
- https://ubuntu.com/security/notices/USN-3835-1
- https://ubuntu.com/security/notices/USN-3871-1
- https://ubuntu.com/security/notices/USN-3871-3
- https://ubuntu.com/security/notices/USN-3871-4
- https://ubuntu.com/security/notices/USN-3880-1
- https://ubuntu.com/security/notices/USN-3880-2
- https://ubuntu.com/security/notices/USN-3871-5
- NVD
- Launchpad
- Debian