CVE-2018-20836
Published: 7 May 2019
An issue was discovered in the Linux kernel before 4.20. There is a race condition in smp_task_timedout() and smp_task_done() in drivers/scsi/libsas/sas_expander.c, leading to a use-after-free.
From the Ubuntu Security Team
It was discovered that a race condition existed in the Serial Attached SCSI (SAS) implementation in the Linux kernel. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code.
Notes
| Author | Note |
|---|---|
| sbeattie | hard to see how this can be attacker controlled |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
linux-aws Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1032.34)
|
| cosmic |
Released
(4.18.0-1008.10)
|
|
| disco |
Not vulnerable
(4.18.0-1008.10)
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Released
(4.4.0-1090.101)
|
|
|
linux-flo Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Ignored
(abandoned)
|
|
|
linux-aws-hwe Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Released
(4.15.0-1032.34~16.04.1)
|
|
|
linux-azure Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1037.39)
|
| cosmic |
Released
(4.18.0-1008.8)
|
|
| disco |
Not vulnerable
(4.18.0-1008.8)
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Released
(4.15.0-1037.39~16.04.1)
|
|
|
linux-azure-edge Launchpad, Ubuntu, Debian |
cosmic |
Does not exist
|
| bionic |
Released
(4.15.0-1037.39)
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Released
(4.15.0-1037.39~16.04.1)
|
|
|
linux Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-44.47)
|
| cosmic |
Released
(4.18.0-14.15)
|
|
| disco |
Not vulnerable
(4.19.0-12.13)
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Released
(4.4.0-157.185)
|
|
|
Patches: Introduced by 2908d778ab3e244900c310974e1fc1c69066e450 |
||
|
linux-euclid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Ignored
(end of life, was needs-triage)
|
|
|
linux-gcp Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1027.28)
|
| cosmic |
Released
(4.18.0-1006.7)
|
|
| disco |
Not vulnerable
(4.18.0-1006.7)
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Released
(4.15.0-1027.28~16.04.1)
|
|
|
linux-gcp-edge Launchpad, Ubuntu, Debian |
bionic |
Released
(4.18.0-1006.7~18.04.1)
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Does not exist
|
|
|
linux-gke Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Ignored
(end of standard support)
|
|
|
linux-gke-4.15 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1030.32)
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~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
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Does not exist
|
|
|
linux-goldfish Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Ignored
(end of life)
|
|
|
linux-grouper Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Does not exist
|
|
|
linux-hwe Launchpad, Ubuntu, Debian |
bionic |
Released
(4.18.0-14.15~18.04.1)
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| 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
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Released
(4.15.0-45.48~16.04.1)
|
|
|
linux-kvm Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1029.29)
|
| cosmic |
Released
(4.18.0-1007.7)
|
|
| disco |
Not vulnerable
(4.18.0-1007.7)
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Released
(4.4.0-1052.59)
|
|
|
linux-lts-trusty Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Does not exist
|
|
|
linux-lts-utopic Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Does not exist
|
|
|
linux-lts-vivid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Does not exist
|
|
|
linux-lts-wily Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Does not exist
|
|
|
linux-lts-xenial Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Does not exist
|
|
|
linux-maguro Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Does not exist
|
|
|
linux-mako Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Ignored
(abandoned)
|
|
|
linux-manta Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc1)
|
|
| 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)
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Ignored
(end of standard support, was needs-triage)
|
|
|
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)
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Released
(4.15.0-1008.10~16.04.1)
|
|
|
linux-raspi2 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1031.33)
|
| cosmic |
Released
(4.18.0-1009.11)
|
|
| disco |
Not vulnerable
(4.18.0-1009.11)
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Released
(4.4.0-1117.126)
|
|
|
linux-snapdragon Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1053.57)
|
| cosmic |
Does not exist
|
|
| disco |
Not vulnerable
(5.0.0-1010.10)
|
|
| upstream |
Released
(4.20~rc1)
|
|
| xenial |
Released
(4.4.0-1121.127)
|
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.1 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |