CVE-2017-2636

Published: 07 March 2017

Race condition in drivers/tty/n_hdlc.c in the Linux kernel through 4.10.1 allows local users to gain privileges or cause a denial of service (double free) by setting the HDLC line discipline.

From the Ubuntu security team

Alexander Popov discovered that the N_HDLC line discipline implementation in the Linux kernel contained a double-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges.

Priority

High

CVSS 3 base score: 7.8

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
Patches:
Introduced by be10eb7589337e5defbe214dae038a53dd21add8
Fixed by 82f2341c94d270421f383641b7cd670e474db56b
linux-armadaxp
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-azure
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-euclid
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-gcp
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-kvm
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-linaro-omap
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-linaro-shared
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-lts-quantal
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-lts-saucy
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-oem
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-qcm-msm
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)
linux-ti-omap4
Launchpad, Ubuntu, Debian
Upstream
Released (4.11~rc2)

Notes

AuthorNote
jdstrand
android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support
tyhicks
all of our kernels are affected as CONFIG_N_HDLC=m is set
in all releases

References