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CVE-2021-3178

Published: 19 January 2021

** DISPUTED ** fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior.

From the Ubuntu security team

吴异 discovered that the NFS implementation in the Linux kernel did not properly prevent access outside of an NFS export that is a subdirectory of a file system. An attacker could possibly use this to bypass NFS access restrictions.

Priority

Negligible

CVSS 3 base score: 6.5

Status

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

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal Not vulnerable
(5.8.0-1035.37~20.04.1)
upstream
Released (5.11~rc5)
impish Does not exist

jammy Does not exist

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

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal Not vulnerable
(5.8.0-1033.35~20.04.1)
upstream
Released (5.11~rc5)
impish Does not exist

jammy Does not exist

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

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal Not vulnerable
(5.8.0-1032.34~20.04.1)
upstream
Released (5.11~rc5)
impish Does not exist

jammy Does not exist

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

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal Not vulnerable
(5.8.0-1031.32~20.04.2)
upstream
Released (5.11~rc5)
impish Does not exist

jammy Does not exist

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

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal
Released (5.8.0-22.24~20.04.1)
upstream
Released (5.11~rc5)
impish Does not exist

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

upstream
Released (5.11~rc5)
focal
Released (5.4.0-1011.14)
impish Does not exist

jammy Does not exist

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

xenial Does not exist

bionic Does not exist

hirsute Does not exist

focal Not vulnerable
(5.11.0-22.23~20.04.1)
upstream
Released (5.11~rc5)
impish Does not exist

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

focal Not vulnerable
(5.11.0-1015.16~20.04.1)
upstream
Released (5.11~rc5)
impish Does not exist

jammy Does not exist

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

xenial Does not exist

bionic Does not exist

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

upstream
Released (5.11~rc5)
impish Does not exist

jammy Does not exist

linux-aws-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

focal Not vulnerable
(5.11.0-1009.9~20.04.2)
upstream
Released (5.11~rc5)
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

focal Not vulnerable
(5.11.0-1007.7~20.04.2)
upstream
Released (5.11~rc5)
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

focal Not vulnerable
(5.11.0-1008.8~20.04.1)
upstream
Released (5.11~rc5)
jammy Does not exist

linux
Launchpad, Ubuntu, Debian
impish Not vulnerable
(5.11.0-16.17)
focal
Released (5.4.0-67.75)
xenial
Released (4.4.0-204.236)
hirsute Not vulnerable
(5.10.0-14.15)
groovy
Released (5.8.0-49.55)
precise Ignored
(was needs-triage ESM criteria)
trusty Ignored
(was needed ESM criteria)
upstream
Released (5.11~rc5)
bionic
Released (4.15.0-137.141)
jammy Not vulnerable
(5.13.0-19.19)
linux-hwe
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

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

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
xenial
Released (4.15.0-137.141~16.04.1)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
bionic
Released (5.4.0-67.75~18.04.1)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal
Released (5.8.0-49.55~20.04.1)
upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

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

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
jammy Does not exist

linux-lts-trusty
Launchpad, Ubuntu, Debian
impish Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

precise Ignored
(was needs-triage ESM criteria)
upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty
Released (4.4.0-204.236~14.04.1)
upstream
Released (5.11~rc5)
jammy Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
impish Not vulnerable
(5.11.0-1006.6)
precise Does not exist

trusty Does not exist

bionic
Released (4.15.0-1086.88)
groovy
Released (5.8.0-1023.25)
hirsute Not vulnerable
(5.11.0-1003.3)
upstream
Released (5.11~rc5)
focal
Released (5.4.0-1034.35)
xenial
Released (4.4.0-1089.98)
jammy Not vulnerable
(5.13.0-1004.4)
linux-aws
Launchpad, Ubuntu, Debian
impish Not vulnerable
(5.11.0-1006.6)
precise Does not exist

bionic
Released (4.15.0-1095.102)
groovy
Released (5.8.0-1028.30)
hirsute Not vulnerable
(5.11.0-1003.3)
trusty
Released (4.4.0-1087.91)
upstream
Released (5.11~rc5)
focal
Released (5.4.0-1039.41)
xenial
Released (4.4.0-1123.137)
jammy Not vulnerable
(5.13.0-1005.6)
linux-aws-5.0
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

xenial Does not exist

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

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

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

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
bionic
Released (5.4.0-1039.41~18.04.1)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
xenial
Released (4.15.0-1095.102~16.04.1)
jammy Does not exist

linux-azure
Launchpad, Ubuntu, Debian
impish Not vulnerable
(5.11.0-1004.4)
precise Does not exist

bionic Ignored
(superseded by linux-azure-5.3)
groovy
Released (5.8.0-1027.29)
hirsute Not vulnerable
(5.11.0-1002.2)
trusty
Released (4.15.0-1109.121~14.04.1)
upstream
Released (5.11~rc5)
focal
Released (5.4.0-1041.43)
xenial
Released (4.15.0-1109.121~16.04.1)
jammy Not vulnerable
(5.13.0-1006.7)
linux-azure-4.15
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
bionic
Released (4.15.0-1109.121)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

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

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
bionic
Released (5.4.0-1041.43~18.04.1)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

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

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
jammy Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
impish Not vulnerable
(5.11.0-1006.6)
precise Does not exist

trusty Does not exist

bionic Ignored
(superseded by linux-gcp-5.3)
groovy
Released (5.8.0-1027.28)
hirsute Not vulnerable
(5.11.0-1003.3)
upstream
Released (5.11~rc5)
xenial
Released (4.15.0-1094.107~16.04.1)
focal
Released (5.4.0-1038.41)
jammy Not vulnerable
(5.13.0-1005.6)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
bionic
Released (4.15.0-1094.107)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

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

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic
Released (5.4.0-1038.41~18.04.1)
upstream
Released (5.11~rc5)
jammy Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

xenial Does not exist

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

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needed now end-of-life)
upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needed now end-of-life)
upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needed now end-of-life)
upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
bionic
Released (5.4.0-1037.39~18.04.1)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
bionic
Released (5.4.0-1011.12~18.04.2)
jammy Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
impish Not vulnerable
(5.11.0-1005.5)
precise Does not exist

trusty Does not exist

focal
Released (5.4.0-1039.42)
groovy
Released (5.8.0-1025.26)
hirsute Not vulnerable
(5.11.0-1002.2)
upstream
Released (5.11~rc5)
bionic
Released (4.15.0-1066.74)
xenial
Released (4.15.0-1066.74~16.04.1)
jammy Not vulnerable
(5.13.0-1008.10)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

xenial Does not exist

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

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

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

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic
Released (5.4.0-1039.42~18.04.1)
upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

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

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal
Released (5.6.0-1053.57)
upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.11~rc5)
jammy Does not exist

linux-raspi
Launchpad, Ubuntu, Debian
impish Not vulnerable
(5.11.0-1007.7)
precise Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy
Released (5.8.0-1020.23)
hirsute Not vulnerable
(5.11.0-1003.3)
upstream
Released (5.11~rc5)
focal
Released (5.4.0-1030.33)
jammy Not vulnerable
(5.13.0-1008.9)
linux-raspi2
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

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

hirsute Does not exist

upstream
Released (5.11~rc5)
bionic
Released (4.15.0-1080.85)
xenial
Released (4.4.0-1147.157)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needed now end-of-life)
upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
bionic
Released (5.4.0-1030.33~18.04.1)
jammy Does not exist

linux-riscv
Launchpad, Ubuntu, Debian
impish Not vulnerable
(5.11.0-1007.7)
precise Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(was needs-triage now end-of-life)
groovy
Released (5.8.0-22.24)
hirsute Not vulnerable
(5.11.0-1004.4)
upstream
Released (5.11~rc5)
jammy Not vulnerable
(5.13.0-1004.4)
linux-snapdragon
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
xenial
Released (4.4.0-1151.161)
bionic
Released (4.15.0-1097.106)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic
Released (4.15.0-1013.17)
upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.11~rc5)
focal
Released (5.10.0-1014.15)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal
Released (5.4.0-1011.12)
upstream
Released (5.11~rc5)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

jammy Not vulnerable
(5.15.0-1002.2)
focal
Released (5.4.0-1037.39)
upstream
Released (5.11~rc5)
xenial Ignored
(reached end of standard support)
linux-ibm
Launchpad, Ubuntu, Debian
impish Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

focal Not vulnerable
(5.4.0-1003.4)
upstream
Released (5.11~rc5)
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

focal Not vulnerable
(5.11.0-1009.10~20.04.1)
hirsute Does not exist

impish Does not exist

upstream
Released (5.11~rc5)
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 (5.11~rc5)
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 (5.11~rc5)
jammy Does not exist

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

xenial Does not exist

bionic Does not exist

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

upstream
Released (5.11~rc5)
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 (5.11~rc5)
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 (5.11~rc5)
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 (5.11~rc5)
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 (5.11~rc5)
jammy Does not exist

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

xenial Does not exist

bionic Does not exist

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

upstream
Released (5.11~rc5)
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 (5.11~rc5)
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 Needed

upstream
Released (5.11~rc5)
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