Public Date:
1094232: CVE-2014-0196 kernel: pty layer race condition leading to memory corruption

The MITRE CVE dictionary describes this issue as:

The n_tty_write function in drivers/tty/n_tty.c in the Linux kernel through 3.14.3 does not properly manage tty driver access in the "LECHO & !OPOST" case, which allows local users to cause a denial of service (memory corruption and system crash) or gain privileges by triggering a race condition involving read and write operations with long strings.

Find out more about CVE-2014-0196 from the MITRE CVE dictionary dictionary and NIST NVD.


This issue did not affect the versions of the Linux kernel packages as shipped with Red Hat Enterprise Linux 5. This issue affected the versions of the Linux kernel packages as shipped with Red Hat Enterprise Linux 6 prior to version kernel-2.6.32-358.6.1.el6, released via RHSA-2013:0744 ( That update added a backport of the upstream commit c56a00a165, which avoided this issue. This flaw requires local system access to be exploited. We are currently not aware of any working exploit for Red Hat Enterprise Linux 6 or Red Hat Enterprise MRG 2.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 6.9
Base Metrics AV:L/AC:M/Au:N/C:C/I:C/A:C
Access Vector Local
Access Complexity Medium
Authentication None
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux AUS (v. 6.2 server) (kernel) RHSA-2014:0520 2014-05-20
Red Hat Enterprise Linux Server EUS (v. 6.3) (kernel) RHSA-2014:0512 2014-05-19
MRG Grid for RHEL 6 Server v.2 (kernel-rt) RHSA-2014:0557 2014-05-27
Red Hat Enterprise Linux version 7 (kernel) RHSA-2014:0678 2014-06-10

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 6 kernel Affected
Red Hat Enterprise Linux 5 kernel Not affected