19 April 2017
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.0990 Important: kernel security update 19 April 2017 =========================================================================== 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-2017-2636 Reference: ESB-2017.0881 Original Bulletin: https://access.redhat.com/errata/RHSA-2017:0986 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security update Advisory ID: RHSA-2017:0986-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2017:0986 Issue date: 2017-04-18 CVE Names: CVE-2017-2636 ===================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 6.4 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. 6.4) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * A race condition flaw was found in the N_HLDC Linux kernel driver when accessing n_hdlc.tbuf list that can lead to double free. A local, unprivileged user able to set the HDLC line discipline on the tty device could use this flaw to increase their privileges on the system. (CVE-2017-2636, Important) Red Hat would like to thank Alexander Popov for reporting this issue. 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/): 1428319 - CVE-2017-2636 kernel: Race condition access to n_hdlc.tbuf causes double free in n_hdlc_release() 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.4): Source: kernel-2.6.32-358.78.1.el6.src.rpm noarch: kernel-doc-2.6.32-358.78.1.el6.noarch.rpm kernel-firmware-2.6.32-358.78.1.el6.noarch.rpm x86_64: kernel-2.6.32-358.78.1.el6.x86_64.rpm kernel-debug-2.6.32-358.78.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-358.78.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-358.78.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.78.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.78.1.el6.x86_64.rpm kernel-devel-2.6.32-358.78.1.el6.x86_64.rpm kernel-headers-2.6.32-358.78.1.el6.x86_64.rpm perf-2.6.32-358.78.1.el6.x86_64.rpm perf-debuginfo-2.6.32-358.78.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.78.1.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.4): Source: kernel-2.6.32-358.78.1.el6.src.rpm x86_64: kernel-debug-debuginfo-2.6.32-358.78.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.78.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.78.1.el6.x86_64.rpm perf-debuginfo-2.6.32-358.78.1.el6.x86_64.rpm python-perf-2.6.32-358.78.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.78.1.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-2017-2636 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is <email@example.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2017 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFY9eUkXlSAg2UNWIIRAmFeAKCdpbP4Du+kPk5Yl2h14YrmM9uLHwCeKFBI UJoS8xX6O7HwjIyr4Vn+5Gs= =85YF - -----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 firstname.lastname@example.org 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: email@example.com 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). 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