RHEL 7 : kernel (RHSA-2017:1125)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

An update for kernel is now available for Red Hat Enterprise Linux 7.2
Extended Update Support.

Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es) :

* A race condition flaw was found in the N_HLDC Linux kernel driver
when accessing n_hdlc.tbuf list that can lead to double free. A local,
unprivileged user able to set the HDLC line discipline on the tty
device could use this flaw to increase their privileges on the system.
(CVE-2017-2636, Important)

Red Hat would like to thank Alexander Popov for reporting this issue.

Bug Fix(es) :

* Previously, memory allocation in the libceph kernel module did not
work correctly. Consequently, the file system on a RADOS Block
Device(RBD) could become unresponsive in the situations under high
memory pressure. With this update, the underlying source code has been
fixed, and the file system no longer hangs in the described scenario.
(BZ#1418314)

* Previously, the mpt3sas driver incorrectly checked the Transport
Layer Retries (TLR) state even on Redundant Array Of Independent Discs
(RAID) devices. Consequently, a kernel panic occurred when mpt3sas
attempted to read from the RAID devices. With this update, mpt3sas has
been fixed to check the TLR state only for non-RAID devices, and the
kernel no longer panics under the described circumstances.
(BZ#1427453)

See also :

https://www.redhat.com/security/data/cve/CVE-2017-2636.html
http://rhn.redhat.com/errata/RHSA-2017-1125.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.8
(CVSS2#E:F/RL:U/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 99683 ()

Bugtraq ID:

CVE ID: CVE-2017-2636

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