RHEL 6 : kernel-rt (RHSA-2015:1564)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

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

Description :

Updated kernel-rt packages that fix three security issues, several
bugs, and add various enhancements are now available for Red Hat
Enterprise MRG 2.5.

Red Hat Product Security has rated this update as having Moderate
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

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

* An integer overflow flaw was found in the way the Linux kernel's
netfilter connection tracking implementation loaded extensions. An
attacker on a local network could potentially send a sequence of
specially crafted packets that would initiate the loading of a large
number of extensions, causing the targeted system in that network to
crash. (CVE-2014-9715, Moderate)

* It was found that the Linux kernel's ping socket implementation did
not properly handle socket unhashing during spurious disconnects,
which could lead to a use-after-free flaw. On x86-64 architecture
systems, a local user able to create ping sockets could use this flaw
to crash the system. On non-x86-64 architecture systems, a local user
able to create ping sockets could use this flaw to escalate their
privileges on the system. (CVE-2015-3636, Moderate)

* It was found that the Linux kernel's TCP/IP protocol suite
implementation for IPv6 allowed the Hop Limit value to be set to a
smaller value than the default one. An attacker on a local network
could use this flaw to prevent systems on that network from sending or
receiving network packets. (CVE-2015-2922, Low)

Red Hat would like to thank Nathan Hoad for reporting the
CVE-2014-9715 issue.

This update provides a build of the kernel-rt package for Red Hat
Enterprise MRG 2.5 that is layered on Red Hat Enterprise Linux 6, and
fixes the following issues :

* drbg: Add stdrng alias and increase priority * seqiv / eseqiv /
chainiv: Move IV seeding into init function * ipv4: kABI fix for
0bbf87d backport * ipv4: Convert ipv4.ip_local_port_range to be per
netns * libceph: tcp_nodelay support * ipr: Increase default adapter
init stage change timeout * fix use-after-free bug in
usb_hcd_unlink_urb() * libceph: fix double __remove_osd() problem *
ext4: fix data corruption caused by unwritten and delayed extents *
sunrpc: Add missing support for RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT *
nfs: Fixing lease renewal (Benjamin Coddington) * control hard lockup
detection default * Fix print-once on enable * watchdog: update
watchdog_thresh properly and watchdog attributes atomically * module:
Call module notifier on failure after complete_formation()

(BZ#1230403)

This update also fixes the following bugs :

* Non-standard usage of the functions write_seqcount_{begin,end}()
were used in NFSv4, which caused the realtime code to try to sleep
while locks were held and produced the 'scheduling while atomic'
messages. The code was modified to use the functions
__write_seqcount_{begin,end}() that do not hold any locks removing the
message and allowing correct execution. (BZ#1225642)

* Dracut in Red Hat Enterprise Linux 6 has a dependency on a module
called scsi_wait_scan that no longer exists on 3.x kernels. This
caused the system to display misleading messages at start-up when the
obsoleted scsi_wait_scan module was not found. To address this issue,
MRG Realtime provides a dummy scsi_wait_scan module so that the
requirements for the initramfs created by dracut are met and the boot
messages are no longer displayed. (BZ#1230403)

All kernel-rt users are advised to upgrade to these updated packages,
which correct these issues and add these enhancements. The system must
be rebooted for this update to take effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2014-9715.html
https://www.redhat.com/security/data/cve/CVE-2015-2922.html
https://www.redhat.com/security/data/cve/CVE-2015-3636.html
http://rhn.redhat.com/errata/RHSA-2015-1564.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 4.9
(CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 4.3
(CVSS2#E:H/RL:OF/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 85249 ()

Bugtraq ID:

CVE ID: CVE-2014-9715
CVE-2015-2922
CVE-2015-3636

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