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).
Notes
Author | Note |
---|---|
alexmurray | Original fix caused a regression so need second commit as well |
Priority
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)
|
|
trusty |
Not vulnerable
(3.11.0-12.19)
|
|
upstream |
Released
(5.6~rc1)
|
|
xenial |
Released
(4.4.0-177.207)
|
|
Patches: Introduced by 30aba6656f61ed44cba445a3c0d38b296fa9e8f5 Introduced by 30aba6656f61ed44cba445a3c0d38b296fa9e8f5 |
||
linux-aws-5.0 Launchpad, Ubuntu, Debian |
trusty |
Does not exist
|
upstream |
Released
(5.6~rc1)
|
|
xenial |
Does not exist
|
|
bionic |
Ignored
(end of life, was pending)
|
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
linux-aws-hwe Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
eoan |
Does not exist
|
|
focal |
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)
|
|
trusty |
Released
(4.15.0-1077.82~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
upstream |
Released
(5.6~rc1)
|
|
xenial |
Released
(4.15.0-1077.82)
|
|
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
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.6~rc1)
|
|
xenial |
Does not exist
|
|
linux-azure-edge Launchpad, Ubuntu, Debian |
bionic |
Ignored
(end of life, was needs-triage)
|
eoan |
Does not exist
|
|
focal |
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)
|
|
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
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.6~rc1)
|
|
xenial |
Does not exist
|
|
linux-gcp-edge Launchpad, Ubuntu, Debian |
bionic |
Ignored
(end of life, was needs-triage)
|
eoan |
Does not exist
|
|
focal |
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
|
|
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
|
|
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
|
|
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
(end of life, was needs-triage)
|
eoan |
Does not exist
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.6~rc1)
|
|
xenial |
Ignored
(end of life, was needs-triage)
|
|
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)
|
|
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
|
|
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
|
|
trusty |
Released
(4.4.0-177.207~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
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
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.6~rc1)
|
|
xenial |
Ignored
(end of standard support, was needs-triage)
|
|
linux-oem-5.6 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
eoan |
Does not exist
|
|
focal |
Not vulnerable
(5.6.0-1007.7)
|
|
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
|
|
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)
|
|
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
|
|
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
|
|
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)
|
|
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
(end of life, was needed)
|
|
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
|
|
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)
|
|
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
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.6~rc1)
|
|
xenial |
Released
(4.4.0-1135.143)
|
|
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)
|
|
trusty |
Released
(4.4.0-1065.69)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
upstream |
Released
(5.6~rc1)
|
|
xenial |
Released
(4.4.0-1105.116)
|
|
linux-azure-4.15 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
|
trusty |
Does not exist
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
|
eoan |
Does not exist
|
|
focal |
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
|
|
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
|
|
trusty |
Does not exist
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.1 |
Attack vector | Local |
Attack complexity | Low |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity impact | None |
Availability impact | High |
Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8428
- https://www.openwall.com/lists/oss-security/2020/01/28/2
- https://www.openwall.com/lists/oss-security/2020/02/02/1
- https://syzkaller.appspot.com/bug?extid=190005201ced78a74ad6
- https://ubuntu.com/security/notices/USN-4318-1
- https://ubuntu.com/security/notices/USN-4319-1
- https://ubuntu.com/security/notices/USN-4320-1
- https://ubuntu.com/security/notices/USN-4325-1
- https://ubuntu.com/security/notices/USN-4324-1
- https://usn.ubuntu.com/lsn/0065-1/
- NVD
- Launchpad
- Debian