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CVE-2018-16884

Publication date 18 December 2018

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.0 · High

Score breakdown

A flaw was found in the Linux kernel's NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.

From the Ubuntu Security Team

Vasily Averin and Evgenii Shatokhin discovered that a use-after-free vulnerability existed in the NFS41+ subsystem when multiple network namespaces are in use. A local attacker in a container could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Status

Package Ubuntu Release Status
linux 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-20.21
18.04 LTS bionic
Fixed 4.15.0-50.54
16.04 LTS xenial
Fixed 4.4.0-145.171
14.04 LTS trusty Ignored
linux-aws 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-1016.18
18.04 LTS bionic
Fixed 4.15.0-1039.41
16.04 LTS xenial
Fixed 4.4.0-1079.89
14.04 LTS trusty
Fixed 4.4.0-1040.43
linux-aws-hwe 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial
Fixed 4.15.0-1039.41~16.04.1
14.04 LTS trusty Not in release
linux-azure 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-1018.18
18.04 LTS bionic
Fixed 4.18.0-1018.18~18.04.1
16.04 LTS xenial
Fixed 4.15.0-1045.49
14.04 LTS trusty
Fixed 4.15.0-1045.49~14.04.1
linux-azure-edge 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.18.0-1018.18~18.04.1
16.04 LTS xenial
Fixed 4.15.0-1045.49
14.04 LTS trusty Not in release
linux-euclid 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-flo 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-gcp 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-1011.12
18.04 LTS bionic
Fixed 4.15.0-1032.34
16.04 LTS xenial
Fixed 4.15.0-1032.34~16.04.1
14.04 LTS trusty Not in release
linux-gcp-edge 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.18.0-1011.12~18.04.1
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-gke-4.15 19.04 disco Not in release
18.04 LTS bionic
Fixed 4.15.0-1032.34
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke-5.0 19.04 disco Not in release
18.04 LTS bionic
Not affected
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-goldfish 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-grouper 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-hwe 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.18.0-20.21~18.04.1
16.04 LTS xenial
Fixed 4.15.0-50.54~16.04.1
14.04 LTS trusty Not in release
linux-hwe-edge 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Not affected
16.04 LTS xenial
Fixed 4.15.0-50.54~16.04.1
14.04 LTS trusty Not in release
linux-kvm 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-1012.12
18.04 LTS bionic
Fixed 4.15.0-1034.34
16.04 LTS xenial
Fixed 4.4.0-1043.49
14.04 LTS trusty Not in release
linux-lts-trusty 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-lts-utopic 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Ignored
linux-lts-vivid 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Ignored
linux-lts-wily 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Ignored
linux-lts-xenial 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty
Fixed 4.4.0-144.170~14.04.1
linux-maguro 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-mako 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-manta 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-oem 19.04 disco
Fixed 4.15.0-1038.43
18.10 cosmic
Fixed 4.15.0-1038.43
18.04 LTS bionic
Fixed 4.15.0-1038.43
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-oracle 19.04 disco
Fixed 4.15.0-1013.15
18.10 cosmic
Fixed 4.15.0-1013.15
18.04 LTS bionic
Fixed 4.15.0-1013.15
16.04 LTS xenial
Fixed 4.15.0-1013.15~16.04.1
14.04 LTS trusty Not in release
linux-raspi2 19.04 disco
Not affected
18.10 cosmic
Fixed 4.18.0-1014.16
18.04 LTS bionic
Fixed 4.15.0-1036.38
16.04 LTS xenial
Fixed 4.4.0-1106.114
14.04 LTS trusty Not in release
linux-snapdragon 19.04 disco
Not affected
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.15.0-1053.57
16.04 LTS xenial
Fixed 4.4.0-1110.115
14.04 LTS trusty Not in release

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
linux

Severity score breakdown

Parameter Value
Base score 8.0 · High
Attack vector Adjacent
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-3932-1
    • Linux kernel vulnerabilities
    • 2 April 2019
    • USN-3932-2
    • Linux kernel (Xenial HWE) vulnerabilities
    • 2 April 2019
    • USN-3980-1
    • Linux kernel vulnerabilities
    • 14 May 2019
    • USN-3981-1
    • Linux kernel vulnerabilities
    • 14 May 2019
    • USN-3981-2
    • Linux kernel (HWE) vulnerabilities
    • 15 May 2019
    • USN-3980-2
    • Linux kernel (HWE) vulnerabilities
    • 14 May 2019

Other references