RHEL 6 : kernel-rt (RHSA-2015:1787)

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 multiple security issues, several
bugs, and add various enhancements are now available for Red Hat
Enterprise Linux 7.

Red Hat Product Security has rated this update as having Important
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.

* Two flaws were found in the way the Linux kernel's networking
implementation handled UDP packets with incorrect checksum values. A
remote attacker could potentially use these flaws to trigger an
infinite loop in the kernel, resulting in a denial of service on the
system, or cause a denial of service in applications using the edge
triggered epoll functionality. (CVE-2015-5364, CVE-2015-5366,
Important)

* A flaw was found in the way the Linux kernel's ext4 file system
handled the 'page size > block size' condition when the fallocate zero
range functionality was used. A local attacker could use this flaw to
crash the system. (CVE-2015-0275, Moderate)

* It was found that the Linux kernel's keyring implementation would
leak memory when adding a key to a keyring via the add_key() function.
A local attacker could use this flaw to exhaust all available memory
on the system. (CVE-2015-1333, Moderate)

* A race condition flaw was found in the way the Linux kernel's SCTP
implementation handled Address Configuration lists when performing
Address Configuration Change (ASCONF). A local attacker could use this
flaw to crash the system via a race condition triggered by setting
certain ASCONF options on a socket. (CVE-2015-3212, Moderate)

* An information leak flaw was found in the way the Linux kernel's
Virtual Dynamic Shared Object (vDSO) implementation performed address
randomization. A local, unprivileged user could use this flaw to leak
kernel memory addresses to user-space. (CVE-2014-9585, Low)

Red Hat would like to thank Canonical for reporting the CVE-2015-1333
issue. The CVE-2015-0275 issue was discovered by Xiong Zhou of Red
Hat, and the CVE-2015-3212 issue was discovered by Ji Jianwen of Red
Hat Engineering.

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 :

* Fix regression in scsi_send_eh_cmnd()

* boot hangs at 'Console: switching to colour dummy device 80x25'

* Update tcp stack to 3.17 kernel

* ksoftirqd high CPU usage due to stray tasklet from ioatdma driver

(BZ#1245345)

This update also fixes the following bugs :

* The configuration option CONFIG_RTC_HCTOSYS was disabled on the
realtime kernel causing the RTC clock to be adjusted with the UTC time
even if the system is configured to set the RTC to the local time. By
enabling the CONFIG_RTC_HCTOSYS configuration option, when the system
is configured to use local time, RTC will correctly update with the
local time and not try to use another timezone. (BZ#1248047)

* In the realtime kernel, if a rt_mutex was taken while in interrupt
context the normal priority inheritance protocol would falsely
identify a deadlock and trigger a kernel crash. The patch that added
the rt_mutex in this interrupt context was reverted. (BZ#1250649)

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-2014-9585.html
https://www.redhat.com/security/data/cve/CVE-2015-0275.html
https://www.redhat.com/security/data/cve/CVE-2015-1333.html
https://www.redhat.com/security/data/cve/CVE-2015-3212.html
https://www.redhat.com/security/data/cve/CVE-2015-5364.html
https://www.redhat.com/security/data/cve/CVE-2015-5366.html
http://rhn.redhat.com/errata/RHSA-2015-1787.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 5.8
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 85979 ()

Bugtraq ID:

CVE ID: CVE-2014-9585
CVE-2015-0275
CVE-2015-1333
CVE-2015-3212
CVE-2015-5364
CVE-2015-5366

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