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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2560 Important: kernel security and bug fix update 2 November 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 6 Impact/Access: Root Compromise -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2016-5195 Reference: ESB-2016.2551 ESB-2016.2550 ESB-2016.2534 ESB-2016.2518 ESB-2016.2513 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2016-2132.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2016:2132-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-2132.html Issue date: 2016-11-01 CVE Names: CVE-2016-5195 ===================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 6.2 Advanced Update Support. 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: Red Hat Enterprise Linux Server AUS (v. 6.2) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 6.2) - x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * A race condition was found in the way the Linux kernel's memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An unprivileged, local user could use this flaw to gain write access to otherwise read-only memory mappings and thus increase their privileges on the system. (CVE-2016-5195, Important) Red Hat would like to thank Phil Oester for reporting this issue. Bug Fix(es): * Previously, the BUG_ON() signal appeared in the fs_clear_inode() function where the nfs_have_writebacks() function reported a positive value for nfs_inode->npages. As a consequence, a kernel panic occurred. The provided patch performs a serialization by holding the inode i_lock over the check of PagePrivate and locking the request, which fixes this bug. (BZ#1365157) 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/): 1384344 - CVE-2016-5195 kernel: mm: privilege escalation via MAP_PRIVATE COW breakage 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.2): Source: kernel-2.6.32-220.68.1.el6.src.rpm noarch: kernel-doc-2.6.32-220.68.1.el6.noarch.rpm kernel-firmware-2.6.32-220.68.1.el6.noarch.rpm x86_64: kernel-2.6.32-220.68.1.el6.x86_64.rpm kernel-debug-2.6.32-220.68.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-220.68.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-220.68.1.el6.x86_64.rpm kernel-devel-2.6.32-220.68.1.el6.x86_64.rpm kernel-headers-2.6.32-220.68.1.el6.x86_64.rpm perf-2.6.32-220.68.1.el6.x86_64.rpm perf-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.2): Source: kernel-2.6.32-220.68.1.el6.src.rpm x86_64: kernel-debug-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-220.68.1.el6.x86_64.rpm perf-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm python-perf-2.6.32-220.68.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-220.68.1.el6.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-2016-5195 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 iD8DBQFYGJgSXlSAg2UNWIIRAjSsAKDBZosbNG/fp+RvGldspm5VwF17KQCdFfuL a6xl/AAR6Sp4dNXHQtW5xgI= =cYAw - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWBkssox+lLeg9Ub1AQitdw//eX2kuThR4mkVvztCiizEbOdNGFvrn7+u 1evB5+8Bf8uxtn+9Vi3hUgoiiy74NPHqORpb92KP3XcrsU85QnpArPFamgHJfvFr lZ7CE2pxtl/DqF19u9rHzapyyb7rwzjlyxDprw9JHxEy2+78z2p6q+DW9G2cQA7Q rAVwK9X5jvmrUaPbgrRrzTKJ/XI78y60o6BZVOuo3CnyrzAbewFWqLhAKGf9FpLg UwOX+eO1zmb5idrcxgVtZ8puwSYX0vBYaoJtY/UR/wd3RsqPEzx9NVhQzf8QW01d aBy4jUXbydN8oMhME4RMYEl5U9Wk8X5/6jkfm8qBcU1aO2QIGWBM29WTsBJVOgXj /LHqdm13tj+m09y2/LM5t3Yuqfy4RFwANh23Ds2j6s1+1BBmguMqhdG505Cyr9tT ONhm802DVZYoOHFXrr3Sgv5fu5+QqFrc6TgAxQQaOhOlaFEpZG8TGD2tV7wUFiTO 4DHeGMs6tev09vKMlrWIBWFmWd5BUYrpRM/bmk6qNuvH4ixAEOEgIhPoQmEGg6kO W322S3VddKndXG4puyTmZ6HtpnhUrcY/UAoqW6Tt+oBZ7C07/49pCTlG8kMDGTdY A02e1h70RdWmnxA9YqB6eV60GjlEjxwJp/F4NjbA3KLdyM+eNATWlCZfGNQle1/d ZnNVV4kMs9c= =QY13 -----END PGP SIGNATURE-----