drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Zwei Probleme in RT-Preempt-Realtime-Patch
Name: |
Zwei Probleme in RT-Preempt-Realtime-Patch |
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ID: |
RHSA-2016:1532-02 |
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Distribution: |
Red Hat |
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Plattformen: |
Red Hat Enterprise MRG for RHEL-6 |
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Datum: |
Mi, 3. August 2016, 08:44 |
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Referenzen: |
https://access.redhat.com/security/cve/CVE-2015-8660
https://access.redhat.com/security/cve/CVE-2016-4470 |
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Applikationen: |
RT-Preempt-Realtime-Patch |
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Originalnachricht |
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
===================================================================== Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update Advisory ID: RHSA-2016:1532-02 Product: Red Hat Enterprise MRG for RHEL-6 Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1532.html Issue date: 2016-08-02 CVE Names: CVE-2015-8660 CVE-2016-4470 =====================================================================
1. Summary:
An update for kernel-rt is now available for Red Hat Enterprise MRG 2.5.
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.
2. Relevant releases/architectures:
MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64
3. Description:
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
* A flaw was found in the Linux kernel's keyring handling code, where in key_reject_and_link() an uninitialised variable would eventually lead to arbitrary free address which could allow attacker to use a use-after-free style attack. (CVE-2016-4470, Important)
* The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr operations, which allows local users to bypass intended access restrictions and modify the attributes of arbitrary overlay files via a crafted application. (CVE-2015-8660, Moderate)
Red Hat would like to thank Nathan Williams for reporting CVE-2015-8660. The CVE-2016-4470 issue was discovered by David Howells (Red Hat Inc.).
The kernel-rt packages have been upgraded to upstream version 3.10.0-327.rt56.194.el6rt, which provides a number of bug fixes over the previous version. (BZ#1343658)
This update also fixes the following bugs:
* Previously, use of the get/put_cpu_var() function in function refill_stock() from the memcontrol cgroup code lead to a "scheduling while atomic" warning. With this update, refill_stock() uses the get/put_cpu_light() function instead, and the warnings no longer appear. (BZ#1348710)
* Prior to this update, if a real time task pinned to a given CPU was taking 100% of the CPU time, then calls to the lru_add_drain_all() function on other CPUs blocked for an undetermined amount of time. This caused latencies and undesired side effects. With this update, lru_add_drain_all() has been changed to drain the LRU pagevecs of remote CPUs. (BZ#1348711)
4. Solution:
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
5. Bugs fixed (https://bugzilla.redhat.com/):
1291329 - CVE-2015-8660 kernel: Permission bypass on overlayfs during copy_up 1341716 - CVE-2016-4470 kernel: Uninitialized variable in request_key handling causes kernel crash in error handling path 1343658 - update the MRG 2.5.z 3.10 kernel-rt sources
6. Package List:
MRG Realtime for RHEL 6 Server v.2:
Source: kernel-rt-3.10.0-327.rt56.194.el6rt.src.rpm
noarch: kernel-rt-doc-3.10.0-327.rt56.194.el6rt.noarch.rpm kernel-rt-firmware-3.10.0-327.rt56.194.el6rt.noarch.rpm
x86_64: kernel-rt-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-debug-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-debug-devel-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-debuginfo-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-devel-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-trace-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-trace-devel-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-vanilla-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-vanilla-debuginfo-3.10.0-327.rt56.194.el6rt.x86_64.rpm kernel-rt-vanilla-devel-3.10.0-327.rt56.194.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/
7. References:
https://access.redhat.com/security/cve/CVE-2015-8660 https://access.redhat.com/security/cve/CVE-2016-4470 https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/
Copyright 2016 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1
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