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CVE-2020-10690

Published: 8 May 2020

There is a use-after-free in kernel versions before 5.5 due to a race condition between the release of ptp_clock and cdev while resource deallocation. When a (high privileged) process allocates a ptp device file (like /dev/ptpX) and voluntarily goes to sleep. During this time if the underlying device is removed, it can cause an exploitable condition as the process wakes up to terminate and clean all attached files. The system crashes due to the cdev structure being invalid (as already freed) which is pointed to by the inode.

From the Ubuntu Security Team

It was discovered that a race condition existed in the Precision Time Protocol (PTP) implementation in the Linux kernel, leading to a use-after- free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Priority

Medium

CVSS 3 base score: 6.4

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-88.88)
eoan
Released (5.3.0-40.32)
focal Not vulnerable
(5.4.0-18.22)
precise Ignored
(was needs-triage ESM criteria)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.5~rc5)
xenial
Released (4.4.0-185.215)
Patches:
Introduced by

d94ba80ebbea17f036cecb104398fbcd788aa742

Fixed by a33121e5487b424339636b25c35d3a180eaa5f5e
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1060.62)
eoan
Released (5.3.0-1011.12)
focal Not vulnerable
(5.4.0-1005.5)
precise Does not exist

trusty
Released (4.4.0-1074.78)
upstream
Released (5.5~rc5)
xenial
Released (4.4.0-1110.121)
linux-aws-5.0
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 (5.5~rc5)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1016.17~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
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 (5.5~rc5)
xenial
Released (4.15.0-1060.62~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
eoan
Released (5.3.0-1013.14)
focal Not vulnerable
(5.4.0-1006.6)
precise Does not exist

trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.5~rc5)
xenial
Released (4.15.0-1071.76)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1082.92)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1013.14~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
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 (5.5~rc5)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
eoan
Released (5.3.0-1012.13)
focal Not vulnerable
(5.4.0-1005.5)
precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial
Released (4.15.0-1055.59)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1071.81)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1012.13~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
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 (5.5~rc5)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1052.55)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1030.31)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1012.13~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-40.32~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial
Released (4.15.0-88.88~16.04.1)
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 (5.5~rc5)
xenial Ignored
(was needs-triage now end-of-life)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1053.53)
eoan
Released (5.3.0-1010.11)
focal Not vulnerable
(5.4.0-1004.4)
precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial
Released (4.4.0-1076.83)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

precise Ignored
(was needs-triage ESM criteria)
trusty Does not exist

upstream
Released (5.5~rc5)
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 (4.4.0-185.215~14.04.1)
upstream
Released (5.5~rc5)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1073.83)
eoan Pending
(4.15.0-1076.86)
focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
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 (5.5~rc5)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1039.44)
eoan Pending
(5.0.0-1043.48)
focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1033.36)
eoan
Released (5.3.0-1009.10)
focal Not vulnerable
(5.4.0-1005.5)
precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial
Released (4.15.0-1033.36~16.04.1)
linux-oracle-5.0
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 (5.5~rc5)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1011.12~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
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 (5.5~rc5)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1055.59)
eoan
Released (5.3.0-1018.20)
focal Ignored
(was needs-triage now end-of-life)
precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial
Released (4.4.0-1135.144)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1018.20~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
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 (5.5~rc5)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1072.79)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.5~rc5)
xenial
Released (4.4.0-1139.147)