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CVE-2019-18805

Published: 7 November 2019

An issue was discovered in net/ipv4/sysctl_net_ipv4.c in the Linux kernel before 5.0.11. There is a net/ipv4/tcp_input.c signed integer overflow in tcp_ack_update_rtt() when userspace writes a very large integer to /proc/sys/net/ipv4/tcp_min_rtt_wlen, leading to a denial of service or possibly unspecified other impact, aka CID-19fad20d15a6.

Notes

AuthorNote
sbeattie
requires write access to /proc/sys/net/ipv4/tcp_min_rtt_wlen
... which is probably possible with unprivileged user namespaces;
Marking when this sysctl was added as the break line

Priority

Low

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
linux-hwe-5.8
Launchpad, Ubuntu, Debian
bionic Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

focal Not vulnerable
(5.8.0-23.24~20.04.1)
upstream
Released (5.1~rc7)
linux-gke-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(5.4.0-1025.25~18.04.1)
upstream
Released (5.1~rc7)
linux-gkeop-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(5.4.0-1001.1)
upstream
Released (5.1~rc7)
linux-dell300x
Launchpad, Ubuntu, Debian
focal Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(4.15.0-1005.8)
upstream
Released (5.1~rc7)
linux-gkeop
Launchpad, Ubuntu, Debian
bionic Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

focal Not vulnerable
(5.4.0-1008.9)
upstream
Released (5.1~rc7)
linux-oem-5.10
Launchpad, Ubuntu, Debian
bionic Does not exist

groovy Does not exist

trusty Does not exist

focal Not vulnerable
(5.10.0-1008.9)
upstream
Released (5.1~rc7)
xenial Does not exist

linux-aws
Launchpad, Ubuntu, Debian
trusty
Released (4.4.0-1054.58)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
bionic
Released (4.15.0-1047.49)
disco Ignored
(end of life, was pending)
eoan Not vulnerable
(5.0.0-1011.12)
focal Not vulnerable
(5.4.0-1005.5)
groovy Not vulnerable
(5.4.0-1009.9)
upstream
Released (5.1~rc7)
xenial
Released (4.4.0-1090.101)
linux-lts-xenial
Launchpad, Ubuntu, Debian
trusty
Released (4.4.0-164.192~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
bionic Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
upstream
Released (5.1~rc7)
bionic Not vulnerable
(5.4.0-1020.20~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

linux-hwe-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-37.41~18.04.1)
upstream
Released (5.1~rc7)
focal Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

linux-raspi-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1013.13~18.04.1)
upstream
Released (5.1~rc7)
focal Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

linux-aws-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1018.18~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1019.19~18.04.2)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1019.19~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-60.67)
disco
Released (5.0.0-21.22)
eoan Not vulnerable
(5.2.0-8.9)
groovy Not vulnerable
(5.4.0-26.30)
trusty Not vulnerable
(3.11.0-12.19)
upstream
Released (5.1~rc7)
xenial
Released (4.4.0-157.185)
focal Not vulnerable
(5.4.0-9.12)
Patches:
Introduced by

bd239704295c66196e6b77c5717ec4aec076ddd5

Fixed by 19fad20d15a6494f47f85d869f00b11343ee5c78
Introduced by

f672258391b42a5c7cc2732c9c063e56a85c8dbe

Fixed by 19fad20d15a6494f47f85d869f00b11343ee5c78
linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-23.24~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial
Released (4.15.0-60.67~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was pending)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Ignored
(end of life, was pending)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial
Released (4.15.0-1047.49~16.04.1)
linux-oem-5.6
Launchpad, Ubuntu, Debian
groovy Does not exist

bionic Does not exist

eoan Does not exist

focal Not vulnerable
(5.6.0-1007.7)
trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1021.24~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1016.17~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1014.14~18.04.1)
disco
Released (5.0.0-1012.12)
eoan Not vulnerable
(5.0.0-1012.12)
focal Not vulnerable
(5.4.0-1006.6)
groovy Not vulnerable
(5.4.0-1010.10)
trusty
Released (4.15.0-1059.64~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.1~rc7)
xenial
Released (4.15.0-1056.61)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1082.92)
eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1007.8~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1042.45)
disco Ignored
(end of life, was pending)
eoan Not vulnerable
(5.0.0-1011.11)
focal Not vulnerable
(5.4.0-1005.5)
groovy Not vulnerable
(5.4.0-1009.9)
trusty Does not exist

upstream
Released (5.1~rc7)
xenial
Released (4.15.0-1041.43)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1071.81)
eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1008.9~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1041.43)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
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

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1011.12~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1043.43)
disco Ignored
(end of life, was pending)
eoan Not vulnerable
(5.0.0-1011.12)
focal Not vulnerable
(5.4.0-1004.4)
groovy Not vulnerable
(5.4.0-1009.9)
trusty Does not exist

upstream
Released (5.1~rc7)
xenial
Released (4.4.0-1052.59)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1056.65)
disco Ignored
(end of life, was pending)
eoan
Released (4.15.0-1059.68)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Ignored
(end of standard support, was needs-triage)
linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1015.16)
disco Ignored
(end of life, was pending)
eoan
Released (5.0.0-1018.20)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1022.25)
disco Ignored
(end of life, was pending)
eoan Not vulnerable
(5.3.0-1002.2)
focal Not vulnerable
(5.4.0-1005.5)
groovy Not vulnerable
(5.4.0-1009.9)
trusty Does not exist

upstream
Released (5.1~rc7)
xenial
Released (4.15.0-1022.25~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1007.12~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1011.12~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

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

eoan Does not exist

focal Not vulnerable
(5.4.0-1007.7)
groovy Not vulnerable
(5.4.0-1008.8)
trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1044.47)
disco Ignored
(end of life, was pending)
eoan Not vulnerable
(5.0.0-1013.13)
focal Not vulnerable
(5.4.0-1004.4)
groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial
Released (4.4.0-1117.126)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1017.19~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

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

eoan Does not exist

focal Not vulnerable
(5.4.0-24.28)
groovy Not vulnerable
(5.4.0-24.28)
trusty Does not exist

upstream
Released (5.1~rc7)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1062.69)
disco Ignored
(end of life, was pending)
eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.1~rc7)
xenial
Released (4.4.0-1121.127)

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H