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CVE-2021-3732

Published: 27 August 2021

A security issue was found in Linux kernel’s OverlayFS subsystem where a local attacker who has the ability to mount the TmpFS filesystem with OverlayFS can abuse a logic bug in the overlayfs code which can inadvertently reveal files hidden in the original mount.

From the Ubuntu security team

Alois Wohlschlager discovered that the overlay file system in the Linux kernel did not restrict private clones in some situations. An attacker could use this to expose sensitive information.

Priority

Medium

CVSS 3 base score: 5.5

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-159.167)
focal
Released (5.4.0-89.100)
hirsute
Released (5.11.0-38.42)
impish Not vulnerable
(5.13.0-16.16)
jammy Not vulnerable
(5.13.0-19.19)
trusty Ignored
(was needed ESM criteria)
upstream
Released (5.14~rc6)
xenial Ignored
(was needed ESM criteria)
Patches:
Introduced by

c771d683a62e5d36bc46036f5c07f4f5bb7dda61

Fixed by 427215d85e8d1476da1a86b8d67aceb485eb3631
Introduced by

local-overlayfs-backport

Fixed by 427215d85e8d1476da1a86b8d67aceb485eb3631
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1112.119)
focal
Released (5.4.0-1058.61)
hirsute
Released (5.11.0-1020.21)
impish Not vulnerable
(5.13.0-1005.6)
jammy Not vulnerable
(5.13.0-1005.6)
trusty Ignored
(was needed ESM criteria)
upstream
Released (5.14~rc6)
xenial Ignored
(was needed ESM criteria)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-aws-5.3)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal
Released (5.11.0-1020.21~20.04.2)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

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

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial 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(superseded by linux-aws-5.4)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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-aws-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1058.61~18.04.3)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial
Released (4.15.0-1112.119~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.3)
focal
Released (5.4.0-1062.65)
hirsute
Released (5.11.0-1020.21)
impish Not vulnerable
(5.13.0-1004.5)
jammy Not vulnerable
(5.13.0-1006.7)
trusty
Released (4.15.0-1124.137~14.04.1)
upstream
Released (5.14~rc6)
xenial
Released (4.15.0-1124.137~16.04.1)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1124.137)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal
Released (5.11.0-1020.21~20.04.1)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal Not vulnerable
(5.13.0-1009.10~20.04.2)
impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial 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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1062.65~18.04.1)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial 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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal Not vulnerable
(5.4.0-1063.66+cvm2.2)
impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal
Released (5.4.0-1020.23)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-dell300x
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1028.33)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Ignored
(was needed ESM criteria)
linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.3)
focal
Released (5.4.0-1056.60)
hirsute
Released (5.11.0-1021.23)
impish Not vulnerable
(5.13.0-1003.4)
jammy Not vulnerable
(5.13.0-1005.6)
trusty Does not exist

upstream
Released (5.14~rc6)
xenial
Released (4.15.0-1109.123~16.04.1)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1109.123)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal
Released (5.11.0-1021.23~20.04.1)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal Not vulnerable
(5.13.0-1008.9~20.04.3)
impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial 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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1056.60~18.04.1)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial 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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal
Released (5.4.0-1054.57)
hirsute Does not exist

impish Does not exist

jammy Not vulnerable
(5.15.0-1002.2)
trusty Does not exist

upstream
Released (5.14~rc6)
xenial Ignored
(reached end of standard support)
linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-gke-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1054.57~18.04.1)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal
Released (5.4.0-1025.26)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-gkeop-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1025.26~18.04.1)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial
Released (4.15.0-159.167~16.04.1)
linux-hwe-5.11
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (5.11.0-38.42~20.04.1)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

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

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-hwe-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-89.100~18.04.1)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial 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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Ignored
(superseded by linux-hwe)
linux-ibm
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (5.4.0-1006.7)
hirsute Does not exist

impish Does not exist

jammy Not vulnerable
(5.15.0-1002.2)
trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-ibm-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1010.11~18.04.2)
focal Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal Not vulnerable
(5.13.0-1007.7)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-intel-iotg
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

impish Does not exist

jammy Not vulnerable

trusty Does not exist

upstream Needs triage

xenial Does not exist

linux-intel-iotg-5.15
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Not vulnerable

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1100.102)
focal
Released (5.4.0-1048.50)
hirsute
Released (5.11.0-1018.19)
impish Not vulnerable
(5.13.0-1002.2)
jammy Not vulnerable
(5.13.0-1004.4)
trusty Does not exist

upstream
Released (5.14~rc6)
xenial Ignored
(was needed ESM criteria)
linux-lowlatency
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

impish Does not exist

jammy Not vulnerable
(5.15.0-22.22)
trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Ignored
(was needed ESM criteria)
upstream
Released (5.14~rc6)
xenial Does not exist

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

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Ignored
(superseded by linux-hwe)
linux-oem-5.10
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (5.10.0-1050.52)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal
Released (5.13.0-1014.18)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal Not vulnerable
(5.14.0-1004.4)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal Does not exist

impish Does not exist

jammy Not vulnerable
(5.17.0-1003.3)
trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1081.89)
focal
Released (5.4.0-1056.60)
hirsute
Released (5.11.0-1020.21)
impish Not vulnerable
(5.13.0-1008.10)
jammy Not vulnerable
(5.13.0-1008.10)
trusty Does not exist

upstream
Released (5.14~rc6)
xenial
Released (4.15.0-1081.89~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-oracle-5.3)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal
Released (5.11.0-1020.21~20.04.1)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal Not vulnerable
(5.13.0-1011.13~20.04.2)
impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial 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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1056.60~18.04.1)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal
Released (5.4.0-1045.49)
hirsute
Released (5.11.0-1021.22)
impish Not vulnerable
(5.13.0-1007.8)
jammy Not vulnerable
(5.13.0-1008.9)
trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-raspi-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1045.49~18.04.1)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1096.102)
focal Ignored
(replaced by linux-raspi)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Ignored
(was needs-triage now end-of-life)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal Ignored
(superseded by linux-riscv-5.8)
hirsute
Released (5.11.0-1021.22)
impish Not vulnerable
(5.13.0-1003.3)
jammy Not vulnerable
(5.13.0-1004.4)
trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

focal
Released (5.11.0-1021.22~20.04.1)
hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

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

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

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1113.122)
focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream
Released (5.14~rc6)
xenial Ignored
(was needs-triage now end-of-life)