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CVE-2020-8648

Published: 6 February 2020

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the n_tty_receive_buf_common function in drivers/tty/n_tty.c.

From the Ubuntu Security Team

It was discovered that the virtual terminal implementation in the Linux kernel contained a race condition. A local attacker could possibly use this to cause a denial of service (system crash) or expose sensitive information.

Notes

AuthorNote
cascardo
This looks like a race between set_selection_kernel and
paste_selection that may lead to data leak.

Priority

Medium

Cvss 3 Severity Score

7.1

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
xenial
Released (4.4.0-1106.117)
bionic
Released (4.15.0-1066.70)
eoan
Released (5.3.0-1017.18)
focal Not vulnerable
(5.4.0-1007.7)
trusty
Released (4.4.0-1066.70)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.6~rc3)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needed)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
xenial 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~rc3)
xenial
Released (4.15.0-1066.70~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needed)
eoan
Released (5.3.0-1020.21)
focal Not vulnerable
(5.4.0-1008.8)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.6~rc3)
xenial
Released (4.15.0-1082.92~16.04.1)
linux-azure-4.15
Launchpad, Ubuntu, Debian
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
xenial Does not exist

bionic Not vulnerable
(4.15.0-1082.92)
linux-azure-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

upstream
Released (5.6~rc3)
xenial Does not exist

bionic
Released (5.3.0-1020.21~18.04.1)
eoan Does not exist

focal Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needed)
eoan
Released (5.3.0-1018.19)
focal Not vulnerable
(5.4.0-1007.7)
trusty Does not exist

upstream
Released (5.6~rc3)
xenial
Released (4.15.0-1061.65)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1071.81)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1018.19~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
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~rc3)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1058.61)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1035.36)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1018.19~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-51.44~18.04.2)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
xenial
Released (4.15.0-99.100~16.04.1)
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~rc3)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1059.60)
eoan
Released (5.3.0-1016.17)
focal Not vulnerable
(5.4.0-1006.6)
trusty Does not exist

upstream
Released (5.6~rc3)
xenial
Released (4.4.0-1070.77)
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~rc3)
xenial Does not exist

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

eoan Does not exist

focal Does not exist

trusty
Released (4.4.0-178.208~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.6~rc3)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1080.90)
eoan Ignored
(end of life, was pending)
focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
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~rc3)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1050.55)
eoan Ignored
(end of life, was pending)
focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1038.42)
eoan
Released (5.3.0-1016.18)
focal Not vulnerable
(5.4.0-1007.7)
trusty Does not exist

upstream
Released (5.6~rc3)
xenial
Released (4.15.0-1038.42~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needed)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1016.18~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
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~rc3)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1061.65)
eoan
Released (5.3.0-1023.25)
focal Ignored
(end of life, was needs-triage)
trusty Does not exist

upstream
Released (5.6~rc3)
xenial
Released (4.4.0-1132.141)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1023.25~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
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~rc3)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1077.84)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc3)
xenial
Released (4.4.0-1136.144)
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-99.100)
eoan
Released (5.3.0-51.44)
focal Not vulnerable
(5.4.0-21.25)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.6~rc3)
xenial
Released (4.4.0-178.208)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by 07e6124a1a46b4b5a9b3cacc0c306b50da87abf5
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~rc3)
xenial Does not exist

linux-aws-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~rc3)
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