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CVE-2020-12826

Published: 12 May 2020

A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.

From the Ubuntu security team

It was discovered that the exit signaling implementation in the Linux kernel contained an integer overflow. A local attacker could use this to cause a denial of service (arbitrary application crash).

Priority

Medium

CVSS 3 base score: 5.3

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-101.102)
eoan
Released (5.3.0-53.47)
focal
Released (5.4.0-31.35)
groovy Not vulnerable
(5.4.0-42.46)
precise Ignored
(was needed ESM criteria)
trusty Ignored
(was needed ESM criteria)
upstream
Released (5.7~rc1)
xenial
Released (4.4.0-184.214)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by d1e7fd6462ca9fc76650fbe6ca800e35b24267da
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1067.71)
eoan
Released (5.3.0-1019.21)
focal
Released (5.4.0-1011.11)
groovy Not vulnerable
(5.4.0-1020.20)
precise Does not exist

trusty
Released (4.4.0-1073.77)
upstream
Released (5.7~rc1)
xenial
Released (4.4.0-1109.120)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1019.21~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
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

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial
Released (4.15.0-1067.71~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
eoan
Released (5.3.0-1022.23)
focal
Released (5.4.0-1012.12)
groovy Not vulnerable
(5.4.0-1022.22)
precise Does not exist

trusty
Released (4.15.0-1083.93~14.04.1)
upstream
Released (5.7~rc1)
xenial
Released (4.15.0-1083.93~16.04.1)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1083.93)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1022.23~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial 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

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-dell300x
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1005.8)
focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
eoan
Released (5.3.0-1020.22)
focal
Released (5.4.0-1011.11)
groovy Not vulnerable
(5.4.0-1021.21)
precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial
Released (4.15.0-1071.81~16.04.1)
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

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1020.22~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
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

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1059.62)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1037.38)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1020.22~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-gke-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1025.25~18.04.1)
focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

focal Not vulnerable
(5.4.0-1008.9)
groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-gkeop-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1001.1)
focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-53.47~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial
Released (4.15.0-101.102~16.04.1)
linux-hwe-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-37.41~18.04.1)
focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

focal Not vulnerable
(5.8.0-23.24~20.04.1)
groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Ignored
(was needs-triage now end-of-life)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1060.61)
eoan
Released (5.3.0-1017.19)
focal
Released (5.4.0-1011.11)
groovy Not vulnerable
(5.4.0-1015.15)
precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial
Released (4.4.0-1075.82)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

precise Ignored
(was needed ESM criteria)
trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty
Released (4.4.0-184.214~14.04.1)
upstream
Released (5.7~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1081.91)
eoan Ignored
(reached end-of-life)
focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Ignored
(was needs-triage now end-of-life)
linux-oem-5.10
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Not vulnerable
(5.10.0-1008.9)
groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.6.0-1010.10)
groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1052.57)
eoan Ignored
(reached end-of-life)
focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1039.43)
eoan
Released (5.3.0-1018.20)
focal
Released (5.4.0-1011.11)
groovy Not vulnerable
(5.4.0-1021.21)
precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial
Released (4.15.0-1039.43~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1018.20~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
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

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.4.0-1011.11)
groovy Not vulnerable
(5.4.0-1012.12)
precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1062.66)
eoan
Released (5.3.0-1025.27)
focal Ignored
(was needs-triage now end-of-life)
groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial
Released (4.4.0-1134.143)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1026.28~18.04.1)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.4.0-26.30)
groovy Not vulnerable
(5.4.0-27.31)
precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1079.86)
eoan Does not exist

focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.7~rc1)
xenial
Released (4.4.0-1138.146)