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CVE-2020-8428

Published: 29 January 2020

fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed.

From the Ubuntu security team

Al Viro discovered that the vfs layer in the Linux kernel contained a use- after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory).

Priority

Medium

CVSS 3 base score: 7.1

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-96.97)
eoan
Released (5.3.0-46.38)
focal Not vulnerable
(5.4.0-18.22)
precise Not vulnerable
(3.0.0-12.20)
trusty Not vulnerable
(3.11.0-12.19)
upstream
Released (5.6~rc1)
xenial
Released (4.4.0-177.207)
Patches:
Introduced by

30aba6656f61ed44cba445a3c0d38b296fa9e8f5

Fixed by d0cb50185ae942b03c4327be322055d622dc79f6
Introduced by

30aba6656f61ed44cba445a3c0d38b296fa9e8f5

Fixed by 6404674acd596de41fd3ad5f267b4525494a891a
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1065.69)
eoan
Released (5.3.0-1016.17)
focal Not vulnerable
(5.4.0-1005.5)
precise Does not exist

trusty
Released (4.4.0-1065.69)
upstream
Released (5.6~rc1)
xenial
Released (4.4.0-1105.116)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(was pending \[5.0.0-1028.31\] now end-of-life)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable

eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

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

eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial
Released (4.15.0-1065.69~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1036.38)
eoan
Released (5.3.0-1019.20)
focal Not vulnerable
(5.4.0-1006.6)
precise Does not exist

trusty
Released (4.15.0-1077.82~14.04.1)
upstream
Released (5.6~rc1)
xenial
Released (4.15.0-1077.82)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable

eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1019.20~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~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

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1034.35)
eoan
Released (5.3.0-1017.18)
focal Not vulnerable
(5.4.0-1005.5)
precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial
Released (4.15.0-1060.64)
linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1017.18~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~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

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1057.60)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1033.34)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1017.18~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-46.38~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial
Released (4.15.0-96.97~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Ignored
(was needs-triage now end-of-life)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1058.59)
eoan
Released (5.3.0-1015.16)
focal Not vulnerable
(5.4.0-1004.4)
precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial
Released (4.4.0-1069.76)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

precise Not vulnerable
(3.13.0-24.46~precise1)
trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

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

eoan Does not exist

focal Does not exist

precise Does not exist

trusty
Released (4.4.0-177.207~14.04.1)
upstream
Released (5.6~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1079.89)
eoan
Released (4.15.0-1079.89)
focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Ignored
(was needs-triage now end-of-life)
linux-oem-5.6
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

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

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1047.52)
eoan
Released (5.0.0-1047.52)
focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1037.41)
eoan
Released (5.3.0-1014.15)
focal Not vulnerable
(5.4.0-1005.5)
precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial
Released (4.15.0-1037.41~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1014.19)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1014.15~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
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)
precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1060.64)
eoan
Released (5.3.0-1022.24)
focal Ignored
(was needed now end-of-life)
precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial
Released (4.4.0-1131.140)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1022.24~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
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)
precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1076.83)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc1)
xenial
Released (4.4.0-1135.143)