Race condition in Linux kernel - CVE-2017-2636

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Main Vulnerability Database Vulnerabilities #VU92796

Race condition in Linux kernel - CVE-2017-2636

Published: March 8, 2017 / Updated: February 24, 2023


Vulnerability identifier: #VU92796
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-2636
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to execute arbitrary code.

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.


Affected software

Linux kernel
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME
Arch Linux
SUSE Linux Enterprise Server 11
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Server for ARM
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
MRG Realtime
Red Hat Virtualization Host
linux-grsec
kernel (Red Hat package)
kernel-syms
kernel-xen-base
kernel-ec2
kernel-source
kernel-trace-base
kernel-default-devel
kernel-ec2-devel
kernel-xen-devel
kernel-ec2-base
kernel-default-base
kernel-trace-devel
kernel-xen
kernel-trace
kernel-default
kernel-rt (Red Hat package)
linux-lts
Linux
linux-zen

How to mitigate CVE-2017-2636

Install update from vendor's repository.

linux-grsec - update to 1
kernel (Red Hat package) - addressed in versions 2.6.32-358.78.1.el6, 2.6.32-504.60.2.el6, 2.6.32-696.1.1.el6, 3.10.0-327.53.1.el7, 3.10.0-514.16.1.el7
kernel-syms - update to 3.0.101-108.174.1
kernel-xen-base - update to 3.0.101-108.174.1
kernel-ec2 - update to 3.0.101-108.174.1
kernel-source - update to 3.0.101-108.174.1
kernel-trace-base - update to 3.0.101-108.174.1
kernel-default-devel - update to 3.0.101-108.174.1
kernel-ec2-devel - update to 3.0.101-108.174.1
kernel-xen-devel - update to 3.0.101-108.174.1
kernel-ec2-base - update to 3.0.101-108.174.1
kernel-default-base - update to 3.0.101-108.174.1
kernel-trace-devel - update to 3.0.101-108.174.1
kernel-xen - update to 3.0.101-108.174.1
kernel-trace - update to 3.0.101-108.174.1
kernel-default - update to 3.0.101-108.174.1
kernel-rt (Red Hat package) - addressed in versions 3.10.0-514.rt56.219.el6rt, 3.10.0-514.16.1.rt56.437.el7
linux-lts - update to 4.9.14-1
Linux - update to 4.10.2-1
linux-zen - update to 4.10.2-1

External References

Related Security Bulletins