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CVE-2021-20322

Published: 19 October 2021

A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to allow the ability to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass the source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well.

From the Ubuntu security team

Keyu Man discovered that the ICMP implementation in the Linux kernel did not properly handle received ICMP error packets. A remote attacker could use this to facilitate attacks on UDP based services that depend on source port randomization.

Priority

Medium

CVSS 3 base score: 7.4

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-167.175)
focal
Released (5.4.0-92.103)
hirsute Ignored
(reached end-of-life)
impish
Released (5.13.0-21.21)
upstream
Released (5.15~rc1)
trusty Ignored
(was needed ESM criteria)
xenial Ignored
(was needed ESM criteria)
jammy Not vulnerable
(5.15.0-17.17)
linux-hwe
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Ignored
(replaced by linux-hwe-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

xenial
Released (4.15.0-167.175~16.04.1)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-hwe-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
bionic
Released (5.4.0-92.103~18.04.2)
jammy Does not exist

linux-hwe-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(was needs-triage now end-of-life)
hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-hwe-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(was needs-triage now end-of-life)
hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Ignored
(superseded by linux-hwe)
bionic Ignored
(superseded by linux-hwe-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

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

bionic Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

trusty Ignored
(was needed ESM criteria)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
trusty Does not exist

hirsute Ignored
(reached end-of-life)
xenial Ignored
(was needed ESM criteria)
bionic
Released (4.15.0-1106.108)
upstream
Released (5.15~rc1)
focal
Released (5.4.0-1051.53)
impish
Released (5.13.0-1005.5)
jammy Not vulnerable
(5.13.0-1006.6+22.04.1)
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1119.127)
hirsute Ignored
(reached end-of-life)
trusty Ignored
(was needed ESM criteria)
xenial Ignored
(was needed ESM criteria)
upstream
Released (5.15~rc1)
focal
Released (5.4.0-1061.64)
impish
Released (5.13.0-1006.7)
jammy Not vulnerable
(5.15.0-1002.4)
linux-aws-5.0
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-aws-5.3)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-aws-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-aws-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
bionic
Released (5.4.0-1061.64~18.04.1)
jammy Does not exist

linux-aws-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-aws-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal
Released (5.11.0-1021.22~20.04.2)
hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-aws-hwe
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
xenial
Released (4.15.0-1119.126~16.04.2)
jammy Does not exist

linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.3)
hirsute Ignored
(reached end-of-life)
trusty
Released (4.15.0-1130.143~14.04.1)
xenial
Released (4.15.0-1130.143~16.04.1)
upstream
Released (5.15~rc1)
focal
Released (5.4.0-1065.68)
impish
Released (5.13.0-1007.8)
jammy Not vulnerable
(5.15.0-1001.2)
linux-azure-4.15
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic
Released (4.15.0-1130.143)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-azure-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
bionic
Released (5.4.0-1065.68~18.04.1)
jammy Does not exist

linux-azure-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-azure-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
focal
Released (5.11.0-1021.22~20.04.1)
jammy Does not exist

linux-bluefield
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
focal
Released (5.4.0-1023.26)
jammy Does not exist

linux-dell300x
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic
Released (4.15.0-1034.39)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-azure-5.3)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Ignored
(superseded by linux-gcp-5.3)
hirsute Ignored
(reached end-of-life)
xenial
Released (4.15.0-1115.129~16.04.1)
upstream
Released (5.15~rc1)
focal
Released (5.4.0-1059.63)
impish
Released (5.13.0-1006.7)
jammy Not vulnerable
(5.15.0-1001.3)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic
Released (4.15.0-1115.129)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-gcp-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
bionic
Released (5.4.0-1059.63~18.04.1)
jammy Does not exist

linux-gcp-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(was needs-triage now end-of-life)
hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-gcp-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal
Released (5.11.0-1022.24~20.04.1)
hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

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

xenial Ignored
(reached end of standard support)
bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
focal
Released (5.4.0-1057.60)
jammy Needs triage

linux-gke-4.15
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(was needs-triage now end-of-life)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-gke-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
bionic
Released (5.4.0-1057.60~18.04.1)
jammy Does not exist

linux-gkeop
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
focal
Released (5.4.0-1029.30)
jammy Does not exist

linux-gkeop-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
bionic
Released (5.4.0-1029.30~18.04.2)
jammy Does not exist

linux-ibm
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
focal
Released (5.4.0-1010.11)
jammy Not vulnerable
(5.15.0-1002.2)
linux-intel-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(was needs-triage now end-of-life)
hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
trusty Does not exist

hirsute Ignored
(reached end-of-life)
xenial
Released (4.15.0-1086.94~16.04.1)
bionic
Released (4.15.0-1086.94)
upstream
Released (5.15~rc1)
focal
Released (5.4.0-1059.63)
impish
Released (5.13.0-1009.11)
jammy Not vulnerable
(5.15.0-1001.3)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-oracle-5.3)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-oracle-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
bionic
Released (5.4.0-1059.63~18.04.1)
jammy Does not exist

linux-oracle-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-oracle-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
focal
Released (5.11.0-1021.22~20.04.1)
jammy Does not exist

linux-oem
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Ignored
(superseded by linux-hwe)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
bionic Ignored
(was needs-triage now end-of-life)
jammy Does not exist

linux-oem-5.6
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
focal Ignored
(was needs-triage now end-of-life)
jammy Does not exist

linux-oem-5.10
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal
Released (5.10.0-1050.52)
hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-oem-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal
Released (5.13.0-1019.23)
hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
jammy Does not exist

linux-oem-5.14
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Not vulnerable
(5.14.0-1004.4)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.15~rc1)
jammy Does not exist

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

xenial Does not exist

bionic Does not exist

hirsute Ignored
(reached end-of-life)
upstream
Released (5.15~rc1)
focal
Released (5.4.0-1048.53)
impish
Released (5.13.0-1010.12)
jammy Not vulnerable
(5.15.0-1002.2)
linux-raspi2
Launchpad, Ubuntu, Debian
trusty Does not exist

focal Ignored
(replaced by linux-raspi)
hirsute Does not exist

impish Does not exist

xenial Ignored
(was needs-triage now end-of-life)
bionic
Released (4.15.0-1102.109)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-raspi2-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-raspi-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
bionic
Released (5.4.0-1048.53~18.04.1)
jammy Does not exist

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

xenial Does not exist

bionic Does not exist

focal Ignored
(superseded by linux-riscv-5.8)
hirsute Ignored
(reached end-of-life)
upstream
Released (5.15~rc1)
impish
Released (5.13.0-1005.5)
jammy Not vulnerable
(5.13.0-1006.6+22.04.1)
linux-riscv-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-riscv-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
focal
Released (5.11.0-1022.23~20.04.1)
jammy Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
trusty Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

xenial Ignored
(was needs-triage now end-of-life)
bionic
Released (4.15.0-1119.128)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-azure-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-1009.10~20.04.2)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-hwe-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-21.21~20.04.1)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-aws-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-1008.9~20.04.2)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-fips
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.15~rc1)
xenial Ignored
(was needed ESM criteria)
jammy Does not exist

linux-oracle-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-1011.13~20.04.2)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-gcp-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-1008.9~20.04.3)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-ibm-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

impish Does not exist

bionic Not vulnerable
(5.4.0-1010.11~18.04.2)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-azure-fde
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.4.0-1063.66+cvm2.2)
upstream
Released (5.15~rc1)
jammy Does not exist

linux-lowlatency
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

impish Does not exist

jammy Not vulnerable

upstream Needs triage

linux-oem-5.17
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

impish Does not exist

jammy Not vulnerable

upstream Needs triage