CVE-2018-16862
Published: 26 November 2018
A security flaw was found in the Linux kernel in a way that the cleancache subsystem clears an inode after the final file truncation (removal). The new file created with the same inode may contain leftover pages from cleancache and the old file data instead of the new one.
From the Ubuntu Security Team
Vasily Averin and Pavel Tikhomirov discovered that the cleancache subsystem of the Linux kernel did not properly initialize new files in some situations. A local attacker could use this to expose sensitive information.
Notes
| Author | Note |
|---|---|
| tyhicks | Only affects Ubuntu kernels running under Xen which use the tmem driver |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
linux Launchpad, Ubuntu, Debian |
upstream |
Released
(4.20~rc5)
|
| trusty |
Not vulnerable
(3.11.0-12.19)
|
|
| bionic |
Released
(4.15.0-58.64)
|
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Not vulnerable
(4.19.0-12.13)
|
|
| xenial |
Released
(4.4.0-142.168)
|
|
|
Patches: Introduced by 91b0abe36a7b2b3b02d7500925a5f8455334f0e5 |
||
|
linux-aws Launchpad, Ubuntu, Debian |
upstream |
Released
(4.20~rc5)
|
| trusty |
Released
(4.4.0-1038.41)
|
|
| xenial |
Released
(4.4.0-1075.85)
|
|
| bionic |
Released
(4.15.0-1047.49)
|
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Not vulnerable
(5.0.0-1001.1)
|
|
|
linux-azure Launchpad, Ubuntu, Debian |
upstream |
Released
(4.20~rc5)
|
| trusty |
Ignored
(was needed ESM criteria)
|
|
| bionic |
Released
(5.0.0-1014.14~18.04.1)
|
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Not vulnerable
(5.0.0-1001.1)
|
|
| xenial |
Released
(4.15.0-1055.60)
|
|
|
linux-azure-edge Launchpad, Ubuntu, Debian |
bionic |
Released
(5.0.0-1014.14~18.04.1)
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Released
(4.15.0-1055.60)
|
|
|
linux-aws-hwe Launchpad, Ubuntu, Debian |
upstream |
Released
(4.20~rc5)
|
| trusty |
Does not exist
|
|
| xenial |
Released
(4.15.0-1047.49~16.04.1)
|
|
| bionic |
Does not exist
|
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
|
linux-euclid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Ignored
(was needs-triage ESM criteria)
|
|
|
linux-flo Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Ignored
(abandoned)
|
|
|
linux-gcp Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1040.42)
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Not vulnerable
(5.0.0-1001.1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Released
(4.15.0-1040.42~16.04.1)
|
|
|
linux-gcp-edge Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1040.42)
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-gke Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Ignored
(end of standard support)
|
|
|
linux-gke-4.15 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1040.42)
|
| disco |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| 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~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-goldfish Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Ignored
(end of life)
|
|
|
linux-grouper Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-hwe Launchpad, Ubuntu, Debian |
bionic |
Released
(5.0.0-23.24~18.04.1)
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Released
(4.15.0-58.64~16.04.1)
|
|
|
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
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Released
(4.15.0-58.64~16.04.1)
|
|
|
linux-kvm Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1042.42)
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Not vulnerable
(5.0.0-1001.1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Released
(4.4.0-1040.46)
|
|
|
linux-lts-trusty Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-lts-utopic Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Ignored
(end of life, was ignored)
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-lts-vivid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Ignored
(end of life, was ignored)
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-lts-wily Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Ignored
(end of life, was ignored)
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-lts-xenial Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Released
(4.4.0-142.168~14.04.1)
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-maguro Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-mako Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Ignored
(abandoned)
|
|
|
linux-manta Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Does not exist
(trusty was ignored [abandoned])
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-oem Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1050.57)
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Released
(4.15.0-1050.57)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Ignored
(end of standard support, was needs-triage)
|
|
|
linux-oracle Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1021.23)
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Released
(5.0.0-1004.8)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Released
(4.15.0-1021.23~16.04.1)
|
|
|
linux-raspi2 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1043.46)
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Not vulnerable
(5.0.0-1004.4)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Released
(4.4.0-1103.111)
|
|
|
linux-snapdragon Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1060.66)
|
| cosmic |
Does not exist
|
|
| disco |
Not vulnerable
(5.0.0-1010.10)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.20~rc5)
|
|
| xenial |
Released
(4.4.0-1107.112)
|
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16862
- https://lore.kernel.org/patchwork/patch/1011367/
- https://ubuntu.com/security/notices/USN-3879-1
- https://ubuntu.com/security/notices/USN-3879-2
- https://ubuntu.com/security/notices/USN-4094-1
- https://ubuntu.com/security/notices/USN-4118-1
- NVD
- Launchpad
- Debian