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CVE-2021-28691

Published: 29 June 2021

Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer.

From the Ubuntu security team

Michael Brown discovered that the Xen netback driver in the Linux kernel did not properly handle malformed packets from a network PV frontend, leading to a use-after-free vulnerability. An attacker in a guest VM could use this to cause a denial of service or possibly execute arbitrary code.

Priority

Medium

CVSS 3 base score: 7.8

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.13.0-16.19)
focal Not vulnerable
(5.4.0-9.12)
hirsute
Released (5.11.0-31.33)
upstream
Released (5.13~rc6)
xenial Not vulnerable
(4.4.0-2.16)
groovy Ignored
(was pending now end-of-life)
impish Not vulnerable
(5.13.0-14.14)
trusty Not vulnerable
(3.11.0-12.19)
jammy Not vulnerable
(5.13.0-19.19)
linux-hwe
Launchpad, Ubuntu, Debian
bionic Ignored
(replaced by linux-hwe-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Not vulnerable
(4.8.0-39.42~16.04.1)
groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

bionic Not vulnerable
(5.4.0-37.41~18.04.1)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

upstream
Released (5.13~rc6)
focal Ignored
(was pending [5.8.0-67.75] now end-of-life)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-hwe-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

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(superseded by linux-hwe)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

impish Does not exist

jammy Does not exist

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

focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
xenial Does not exist

groovy Does not exist

impish Does not exist

trusty Not vulnerable
(4.4.0-13.29~14.04.1)
jammy Does not exist

linux-aws
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1001.1)
focal Not vulnerable
(5.4.0-1005.5)
hirsute
Released (5.11.0-1016.17)
upstream
Released (5.13~rc6)
xenial Not vulnerable
(4.4.0-1001.10)
groovy Ignored
(reached end-of-life)
impish Not vulnerable
(5.11.0-1015.16+21.10.1)
trusty Not vulnerable
(4.4.0-1002.2)
jammy Not vulnerable
(5.13.0-1005.6)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-aws-5.3)
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-aws-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

bionic Not vulnerable
(5.4.0-1018.18~18.04.1)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Not vulnerable
(4.15.0-1030.31~16.04.1)
groovy Does not exist

impish Does not exist

jammy Does not exist

linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.3)
focal Not vulnerable
(5.4.0-1006.6)
hirsute
Released (5.11.0-1013.14)
upstream
Released (5.13~rc6)
xenial Not vulnerable
(4.11.0-1009.9)
groovy Ignored
(reached end-of-life)
impish Not vulnerable
(5.11.0-1013.14+21.10.1)
trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
jammy Not vulnerable
(5.13.0-1006.7)
linux-azure-4.15
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic Not vulnerable
(4.15.0-1082.92)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

bionic Not vulnerable
(4.15.0-1005.8)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.3)
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.3)
focal Not vulnerable
(5.4.0-1005.5)
hirsute
Released (5.11.0-1017.19)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Not vulnerable
(4.10.0-1004.4)
groovy Ignored
(reached end-of-life)
impish Not vulnerable
(5.11.0-1016.18+21.10.2)
jammy Not vulnerable
(5.13.0-1005.6)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
bionic Not vulnerable
(4.15.0-1071.81)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

bionic Not vulnerable
(5.4.0-1019.19~18.04.2)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.3)
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

focal Not vulnerable
(5.4.0-1033.35)
upstream
Released (5.13~rc6)
trusty Does not exist

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

impish Does not exist

jammy Not vulnerable
(5.15.0-1002.2)
linux-gke-4.15
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
bionic Ignored
(was needs-triage now end-of-life)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

bionic Not vulnerable
(5.3.0-1011.12~18.04.1)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

bionic Not vulnerable
(5.4.0-1025.25~18.04.1)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

focal Not vulnerable
(5.4.0-1008.9)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

bionic Not vulnerable
(5.4.0-1001.1)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-oracle-5.3)
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-oracle-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

bionic Not vulnerable
(5.4.0-1019.19~18.04.1)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

upstream
Released (5.13~rc6)
bionic Ignored
(was needs-triage now end-of-life)
trusty Does not exist

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

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

focal
Released (5.10.0-1038.40)
hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

focal Not vulnerable
(5.4.0-1007.7)
upstream
Released (5.13~rc6)
hirsute
Released (5.11.0-1016.17)
trusty Does not exist

xenial Does not exist

groovy Ignored
(reached end-of-life)
impish Not vulnerable
(5.13.0-1006.7)
jammy Not vulnerable
(5.13.0-1008.9)
linux-raspi2
Launchpad, Ubuntu, Debian
focal Ignored
(replaced by linux-raspi)
hirsute Does not exist

bionic Not vulnerable
(4.13.0-1005.5)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Ignored
(was needs-triage now end-of-life)
groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

bionic Not vulnerable
(5.3.0-1017.19~18.04.1)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

upstream
Released (5.13~rc6)
bionic Not vulnerable
(5.4.0-1013.13~18.04.1)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

focal Ignored
(was needs-triage now end-of-life)
hirsute
Released (5.11.0-1017.18)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Ignored
(reached end-of-life)
impish Not vulnerable
(5.13.0-1002.2)
jammy Not vulnerable
(5.13.0-1004.4)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.4.0-1077.82)
focal Does not exist

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Ignored
(was needs-triage now end-of-life)
groovy Does not exist

impish Does not exist

jammy Does not exist

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

focal Not vulnerable
(5.13.0-1009.10)
hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

trusty Does not exist

xenial Does not exist

impish Does not exist

upstream
Released (5.13~rc6)
focal
Released (5.11.0-1016.17~20.04.1)
jammy Does not exist

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

focal
Released (5.11.0-1013.14~20.04.1)
hirsute Does not exist

trusty Does not exist

xenial Does not exist

impish Does not exist

upstream
Released (5.13~rc6)
jammy Does not exist

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

hirsute Does not exist

trusty Does not exist

xenial Does not exist

impish Does not exist

upstream
Released (5.13~rc6)
focal
Released (5.11.0-1016.17~20.04.1)
jammy Does not exist

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

focal
Released (5.8.0-1042.44~20.04.1)
hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

focal
Released (5.8.0-1040.43~20.04.1)
jammy Does not exist

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

focal
Released (5.8.0-1039.41)
hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

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

focal
Released (5.8.0-1038.39~20.04.1)
hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

linux-riscv-5.8
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Ignored
(was pending [5.8.0-33.36] now end-of-life)
hirsute Does not exist

upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

groovy Does not exist

impish Does not exist

jammy Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.2)
focal Not vulnerable
(5.4.0-1004.4)
upstream
Released (5.13~rc6)
hirsute
Released (5.11.0-1014.15)
trusty Does not exist

xenial Not vulnerable
(4.4.0-1004.9)
groovy Ignored
(reached end-of-life)
impish Not vulnerable
(5.13.0-1001.1)
jammy Not vulnerable
(5.13.0-1004.4)
linux-oracle
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1007.9)
focal Not vulnerable
(5.4.0-1005.5)
upstream
Released (5.13~rc6)
hirsute
Released (5.11.0-1016.17)
trusty Does not exist

xenial Not vulnerable
(4.15.0-1007.9~16.04.1)
groovy Ignored
(reached end-of-life)
impish Not vulnerable
(5.11.0-1015.16+21.10.1)
jammy Not vulnerable
(5.13.0-1008.10)
linux-bluefield
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

focal Not vulnerable
(5.4.0-1007.10)
upstream
Released (5.13~rc6)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-hwe-5.11
Launchpad, Ubuntu, Debian
focal
Released (5.11.0-34.36~20.04.1)
upstream
Released (5.13~rc6)
bionic Does not exist

hirsute Does not exist

trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-riscv-5.11
Launchpad, Ubuntu, Debian
upstream
Released (5.13~rc6)
bionic Does not exist

hirsute Does not exist

trusty Does not exist

xenial Does not exist

impish Does not exist

focal
Released (5.11.0-1017.18~20.04.1)
jammy Does not exist

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

xenial Does not exist

impish Does not exist

bionic Does not exist

hirsute Does not exist

focal Not vulnerable
(5.4.0-1003.4)
upstream
Released (5.13~rc6)
jammy Not vulnerable
(5.15.0-1002.2)
linux-gcp-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 (5.13~rc6)
focal
Released (5.11.0-1017.19~20.04.1)
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 (5.13~rc6)
jammy Does not exist

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

xenial Does not exist

bionic Does not exist

focal Not vulnerable

hirsute Does not exist

impish Does not exist

upstream
Released (5.13~rc6)
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 (5.13~rc6)
jammy Does not exist

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

xenial Does not exist

bionic Does not exist

focal Not vulnerable
(5.13.0-21.21~20.04.1)
impish Does not exist

upstream
Released (5.13~rc6)
jammy Does not exist

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

xenial Does not exist

bionic Does not exist

focal Not vulnerable
(5.13.0-1008.9~20.04.2)
impish Does not exist

upstream
Released (5.13~rc6)
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 (5.13~rc6)
xenial Not vulnerable
(4.4.0-1073.79)
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 (5.13~rc6)
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 (5.13~rc6)
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 (5.13~rc6)
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 (5.13~rc6)
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