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CVE-2018-5391

Published: 14 August 2018

The Linux kernel, versions 3.9+, is vulnerable to a denial of service attack with low rates of specially modified packets targeting IP fragment re-assembly. An attacker may cause a denial of service condition by sending specially crafted IP fragments. Various vulnerabilities in IP fragmentation have been discovered and fixed over the years. The current vulnerability (CVE-2018-5391) became exploitable in the Linux kernel with the increase of the IP fragment reassembly queue size.

From the Ubuntu Security Team

Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service.

Notes

AuthorNote
tyhicks
CERT recommends reverting c2a936600f78aea00d3312ea4b66a79a4619f9b4

Priority

High

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1019.19)
cosmic Not vulnerable
(4.15.0-1020.20)
trusty
Released (4.4.0-1027.30)
upstream
Released (4.19~rc4)
xenial
Released (4.4.0-1065.75)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1021.21)
cosmic Not vulnerable
(4.15.0-1023.24)
trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
upstream
Released (4.19~rc4)
xenial
Released (4.15.0-1021.21~16.04.1)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

xenial
Released (4.4.0-9029.31)
trusty Does not exist

upstream
Released (4.19~rc4)
linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1015.18)
trusty Does not exist

upstream
Released (4.19~rc4)
xenial Ignored
(end of standard support, was needs-triage)
cosmic Not vulnerable
(4.15.0-1017.20)
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-32.35)
cosmic Not vulnerable
(4.18.0-9.10)
trusty
Released (3.13.0-155.205)
upstream
Released (4.19~rc4)
xenial
Released (4.4.0-133.159)
Patches:
Introduced by

c2a936600f78aea00d3312ea4b66a79a4619f9b4

Fixed by 7969e5c40dfd04799d4341f1b7cd266b6e47f227|local-2018-5391-fix
Introduced by

c2a936600f78aea00d3312ea4b66a79a4619f9b4

Fixed by 385114dec8a49b5e5945e77ba7de6356106713f4|local-2018-5391-fix
Introduced by

c2a936600f78aea00d3312ea4b66a79a4619f9b4

Fixed by fa0f527358bd900ef92f925878ed6bfbd51305cc|local-2018-5391-fix
Introduced by

c2a936600f78aea00d3312ea4b66a79a4619f9b4

Fixed by 70837ffe3085c9a91488b52ca13ac84424da1042|local-2018-5391-fix
Introduced by

c2a936600f78aea00d3312ea4b66a79a4619f9b4

Fixed by 5d407b071dc369c26a38398326ee2be53651cfe4|local-2018-5391-fix
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-1004.4~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc4)
xenial
Released (4.15.0-1021.21)
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc4)
xenial Ignored
(abandoned)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1017.18)
cosmic Not vulnerable
(4.15.0-1018.19)
trusty Does not exist

upstream
Released (4.19~rc4)
xenial
Released (4.15.0-1017.18~16.04.1)
linux-gke
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc4)
xenial Ignored
(end of standard support)
linux-goldfish
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc4)
xenial Ignored
(end of life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc4)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic Not vulnerable

cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc4)
xenial
Released (4.15.0-32.35~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-11.12~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc4)
xenial
Released (4.15.0-32.35~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1019.19)
cosmic Not vulnerable
(4.18.0-1003.3)
trusty Does not exist

upstream
Released (4.19~rc4)
xenial
Released (4.4.0-1031.37)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc4)
xenial Does not exist

linux-lts-utopic
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
upstream
Released (4.19~rc4)
xenial Does not exist

linux-lts-vivid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
upstream
Released (4.19~rc4)
xenial Does not exist

linux-lts-wily
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
upstream
Released (4.19~rc4)
xenial Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty
Released (4.4.0-133.159~14.04.1)
upstream
Released (4.19~rc4)
xenial Does not exist

linux-maguro
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc4)
xenial Does not exist

linux-mako
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc4)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.19~rc4)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1020.22)
cosmic Not vulnerable
(4.18.0-1005.7)
trusty Does not exist

upstream
Released (4.19~rc4)
xenial
Released (4.4.0-1094.102)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Not vulnerable

cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc4)
xenial
Released (4.4.0-1098.103)

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