RHEL 7 : kernel-rt (RHSA-2015:1788)

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.

* A flaw was found in the kernel's implementation of the Berkeley
Packet Filter (BPF). A local attacker could craft BPF code to crash
the system by creating a situation in which the JIT compiler would
fail to correctly optimize the JIT image on the last pass. This would
lead to the CPU executing instructions that were not part of the JIT
code. (CVE-2015-4700, Important)

* 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 Daniel Borkmann for reporting
CVE-2015-4700, and 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.

The kernel-rt packages have been upgraded to version 3.10.0-229.13.1,
which provides a number of bug fixes and enhancements over the
previous version, including :

* Fix regression in scsi_send_eh_cmnd()

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

* Update tcp stack to 3.17 kernel

* Missing some code from patch '(...) Fix VGA switcheroo problem
related to hotplug'

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

* During Live Partition Mobility (LPM) testing, RHEL 7.1 LPARs will
crash in kmem_cache_alloc

(BZ#1253809)

This update also fixes the following bug :

* The hwlat_detector.ko module samples the clock and records any
intervals between reads that exceed a specified threshold. However,
the module previously tracked the maximum interval seen for the
'inner' interval but did not record when the 'outer' interval was
greater. A patch has been applied to fix this bug, and
hwlat_detector.ko now correctly records if the outer interval is the
maximal interval encountered during the run. (BZ#1252365)

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 :

http://rhn.redhat.com/errata/RHSA-2015-1788.html
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-2015-4700.html
https://www.redhat.com/security/data/cve/CVE-2015-5364.html
https://www.redhat.com/security/data/cve/CVE-2015-5366.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)

Family: Red Hat Local Security Checks

Nessus Plugin ID: 85980 ()

Bugtraq ID:

CVE ID: CVE-2014-9585
CVE-2015-0275
CVE-2015-1333
CVE-2015-3212
CVE-2015-4700
CVE-2015-5364
CVE-2015-5366

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