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CVE-2019-11477

Published: 17 June 2019

Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commit 3b4929f65b0d8249f19a50245cd88ed1a2f78cff.

From the Ubuntu Security Team

Jonathan Looney discovered that an integer overflow existed in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). A remote attacker could use this to cause a denial of service (system crash).

Notes

AuthorNote
tyhicks
Known as "SACK Panic"

Priority

High

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1041.43)
cosmic
Released (4.18.0-1018.20)
disco
Released (5.0.0-1008.8)
upstream
Released (5.2~rc6)
xenial
Released (4.4.0-1085.96)
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Ignored
(abandoned)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial
Released (4.15.0-1041.43~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1020.20~18.04.1)
cosmic
Released (4.18.0-1020.20)
disco
Released (5.0.0-1008.8)
upstream
Released (5.2~rc6)
xenial
Released (4.15.0-1047.51)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Ignored
(end of life, was needed)
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-52.56)
cosmic
Released (4.18.0-22.23)
disco
Released (5.0.0-17.18)
upstream
Released (5.2~rc6)
xenial
Released (4.4.0-151.178)
Patches:
Introduced by

832d11c5cd076abc0aa1eaf7be96c81d1a59ce41

Fixed by 3b4929f65b0d8249f19a50245cd88ed1a2f78cff
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1020.20~18.04.1)
cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial
Released (4.15.0-1047.51)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1034.36)
cosmic
Released (4.18.0-1013.14)
disco
Released (5.0.0-1008.8)
upstream
Released (5.2~rc6)
xenial
Released (4.15.0-1034.36~16.04.1)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1013.14~18.04.1)
cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Ignored
(end of standard support)
linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1034.36)
disco Does not exist

upstream
Released (5.2~rc6)
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 (5.2~rc6)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Ignored
(end of life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-22.23~18.04.1)
cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial
Released (4.15.0-52.56~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-17.18~18.04.1)
cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial
Released (4.15.0-52.56~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1036.36)
cosmic
Released (4.18.0-1014.14)
disco
Released (5.0.0-1008.8)
upstream
Released (5.2~rc6)
xenial
Released (4.4.0-1048.55)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

upstream
Released (5.2~rc6)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1043.48)
cosmic
Released (4.15.0-1043.48)
disco
Released (4.15.0-1043.48)
upstream
Released (5.2~rc6)
xenial Ignored
(end of standard support, was needed)
linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1015.17)
cosmic
Released (4.15.0-1015.17)
disco
Released (4.15.0-1015.17)
upstream
Released (5.2~rc6)
xenial
Released (4.15.0-1015.17~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1038.40)
cosmic
Released (4.18.0-1016.18)
disco
Released (5.0.0-1010.10)
upstream
Released (5.2~rc6)
xenial
Released (4.4.0-1111.120)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1055.59)
cosmic Does not exist

disco
Released (5.0.0-1014.14)
upstream
Released (5.2~rc6)
xenial
Released (4.4.0-1115.121)

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