CVE-2018-16871

Published: 30 July 2019

A flaw was found in the Linux kernel's NFS implementation, all versions 3.x and all versions 4.x up to 4.20. An attacker, who is able to mount an exported NFS filesystem, is able to trigger a null pointer dereference by using an invalid NFS sequence. This can panic the machine and deny access to the NFS server. Any outstanding disk writes to the NFS server will be lost.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-46.49)
	cosmic	Released (4.18.0-14.15)
	disco	Not vulnerable (4.19.0-12.13)
	trusty	Not vulnerable (3.11.0-12.19)
	upstream	Released (4.20~rc3)
	xenial	Not vulnerable (4.2.0-16.19)
	Patches: Introduced by ffa0160a103917defd5d9c097ae0455a59166e03 Fixed by 01310bb7c9c98752cc763b36532fab028e0f8f81
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1033.35)
	cosmic	Released (4.18.0-1008.10)
	disco	Not vulnerable (4.18.0-1008.10)
	trusty	Not vulnerable (4.4.0-1002.2)
	upstream	Released (4.20~rc3)
	xenial	Not vulnerable (4.4.0-1001.10)
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-1033.35~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Released (4.18.0-1011.11~18.04.1)
	cosmic	Released (4.18.0-1008.8)
	disco	Not vulnerable (4.18.0-1008.8)
	trusty	Released (4.15.0-1040.44~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-1040.44)
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Released (4.18.0-1011.11~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-1040.44)
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~rc3)
	xenial	Ignored (end of life, was needs-triage)
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~rc3)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1028.29)
	cosmic	Released (4.18.0-1006.7)
	disco	Not vulnerable (4.18.0-1006.7)
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-1028.29~16.04.1)
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Released (4.18.0-1006.7~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	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~rc3)
	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
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	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~rc3)
	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~rc3)
	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
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-46.49~16.04.1)
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~rc3)
	xenial	Released (4.15.0-46.49~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1030.30)
	cosmic	Released (4.18.0-1007.7)
	disco	Not vulnerable (4.18.0-1007.7)
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Not vulnerable (4.4.0-1004.9)
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~rc3)
	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~rc3)
	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~rc3)
	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~rc3)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Not vulnerable (4.4.0-13.29~14.04.1)
	upstream	Released (4.20~rc3)
	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~rc3)
	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~rc3)
	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~rc3)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1034.39)
	cosmic	Released (4.15.0-1034.39)
	disco	Not vulnerable (4.15.0-1034.39)
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Ignored (end of standard support, was needs-triage)
linux-oracle Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1009.11)
	cosmic	Released (4.15.0-1009.11)
	disco	Not vulnerable (4.15.0-1009.11)
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Released (4.15.0-1009.11~16.04.1)
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1032.34)
	cosmic	Released (4.18.0-1009.11)
	disco	Not vulnerable (4.18.0-1009.11)
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Not vulnerable (4.2.0-1013.19)
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.4.0-1077.82)
	cosmic	Does not exist
	disco	Not vulnerable (5.0.0-1010.10)
	trusty	Does not exist
	upstream	Released (4.20~rc3)
	xenial	Not vulnerable (4.4.0-1012.12)

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Bugs

https://bugzilla.redhat.com/show_bug.cgi?id=1655162

Join the discussion

Canonical is offering Expanded Security Maintenance

Canonical is offering Ubuntu Expanded Security Maintenance (ESM) for security fixes and essential packages.

Find out more about ESM ›