Red Hat: 2015:1787-01: kernel-rt: Important Advisory
Summary
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.
Summary
Solution
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
For details on how to apply this update, refer to:
https://access.redhat.com/articles/11258
References
https://access.redhat.com/security/cve/CVE-2014-9585 https://access.redhat.com/security/cve/CVE-2015-0275 https://access.redhat.com/security/cve/CVE-2015-1333 https://access.redhat.com/security/cve/CVE-2015-3212 https://access.redhat.com/security/cve/CVE-2015-5364 https://access.redhat.com/security/cve/CVE-2015-5366 https://access.redhat.com/security/updates/classification/#important
Package List
MRG Realtime for RHEL 6 Server v.2:
Source:
kernel-rt-3.10.0-229.rt56.161.el6rt.src.rpm
noarch:
kernel-rt-doc-3.10.0-229.rt56.161.el6rt.noarch.rpm
kernel-rt-firmware-3.10.0-229.rt56.161.el6rt.noarch.rpm
x86_64:
kernel-rt-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-debug-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-devel-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-trace-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.0-229.rt56.161.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.0-229.rt56.161.el6rt.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
Topic
Updated kernel-rt packages that fix multiple security issues, several bugs,and add various enhancements are now available for Red Hat EnterpriseLinux 7.Red Hat Product Security has rated this update as having Important securityimpact. Common Vulnerability Scoring System (CVSS) base scores, which givedetailed severity ratings, are available for each vulnerability from theCVE links in the References section.
Topic
Relevant Releases Architectures
MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64
Bugs Fixed
1181054 - CVE-2014-9585 kernel: ASLR bruteforce possible for vdso library
1193907 - CVE-2015-0275 kernel: fs: ext4: fallocate zero range page size > block size BUG()
1226442 - CVE-2015-3212 kernel: SCTP race condition allows list corruption and panic from userlevel
1239029 - CVE-2015-5366 CVE-2015-5364 kernel: net: incorrect processing of checksums in UDP implementation
1245345 - RFE: update the MRG 2.5 3.10 kernel-rt sources
1245658 - CVE-2015-1333 kernel: denial of service due to memory leak in add_key()
