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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1291 Important: kernel security and bug fix update 24 May 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Red Hat Operating System: Red Hat Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-5366 CVE-2015-5364 Reference: ESB-2015.2329 ESB-2015.2110 ESB-2015.2043 ESB-2015.1942 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2016-1096.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-2016:1096-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1096.html Issue date: 2016-05-23 CVE Names: CVE-2015-5364 CVE-2015-5366 ===================================================================== 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): * 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) Bug Fix(es): * Prior to this update, if processes that generate interrupts were active during the guest shutdown sequence, the virtio driver in some cases did not correctly clear the interrupts. As a consequence, the guest kernel became unresponsive, which prevented the shutdown from completing. With this update, the virtio driver processes interrupts more effectively, and guests now shut down reliably in the described scenario. (BZ#1323568) * At a process or thread exit, when the Linux kernel undoes any SysV semaphore operations done previously (the ones done using semop with the SEM_UNDO flag), there was a possible flaw and race with another process or thread removing the same semaphore set where the operations occurred, leading to possible use of in-kernel-freed memory and then to possible unpredictable behavior. This bug could be noticed with software which uses IPC SysV semaphores, such as IBM DB2, which for example in certain cases could lead to some of its processes or utilities to get incorrectly stalled in some IPC semaphore operation or syscall after the race or problem happened. A patch has been provided to fix this bug, and the kernel now behaves as expected in the aforementioned scenario. (BZ#1326341) 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/): 1239029 - CVE-2015-5366 CVE-2015-5364 kernel: net: incorrect processing of checksums in UDP implementation 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.4): Source: kernel-2.6.32-358.71.1.el6.src.rpm noarch: kernel-doc-2.6.32-358.71.1.el6.noarch.rpm kernel-firmware-2.6.32-358.71.1.el6.noarch.rpm x86_64: kernel-2.6.32-358.71.1.el6.x86_64.rpm kernel-debug-2.6.32-358.71.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-358.71.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.71.1.el6.x86_64.rpm kernel-devel-2.6.32-358.71.1.el6.x86_64.rpm kernel-headers-2.6.32-358.71.1.el6.x86_64.rpm perf-2.6.32-358.71.1.el6.x86_64.rpm perf-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.4): Source: kernel-2.6.32-358.71.1.el6.src.rpm x86_64: kernel-debug-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.71.1.el6.x86_64.rpm perf-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm python-perf-2.6.32-358.71.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.71.1.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-2015-5364 https://access.redhat.com/security/cve/CVE-2015-5366 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 iD8DBQFXQwsMXlSAg2UNWIIRAqQGAJ4rAvyXoPPGVAneJMtohEKPeXMIGwCeK6qR BXlMhXfyGRME/4hnOYmg4DQ= =falh - -----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 iQIVAwUBV0OIvX6ZAP0PgtI9AQKXMA//eRM4sdYBLfqTUTSuPMrQ7kswUGCgj2qM 1gRJGOW+dvBpMMS+FYauuyHQETE7eIvlPu2VR9XA/+5L1WAXIVCPUhFU36ADuuOQ d5CBBlhYU2eNcU/IEjztn7ttCBYmk6jZ8UA92KBE/AVwcXScW5b6DddA2JEylEXl 6geKgG0AWpQDJ5A5xkCRYRI8CH7aTzCUCfuJUigilvPMQ1sN03oPMCln3EIj38+w koKWwULsqdm0TV1HOf3tprutz464d/T4ejzUpsxNfvACpVjcGMUFPGpv2oN1Y1oO B0HlAXN3W6xKUdUtr3+/aKCT2qc0gCI5mv7K49Op9VW0/2vKs3uGavII3msiKXJQ bj3r1GB7LhjxTmM2pOLHAmtRMmBFv26VZ/HGCPewbMUwqkY0X/X3CKZaNdfpwSBW 7lwnD/XeJPFaysMxDpTjG1ox5hQtFpxoMZHuJMYz0gSwRhcP47TkLEyyOLDtYjO3 gfXHkzmsymghNNQXBlWDQSPvfIdAy0NtA0udiPOaNnXqIE8HzFtDhDBfkAyFwoJI R4eIWB92TLpHz30TfXFyRYlKEMem213Um+kVFy9fzXwFE+MGmhYARAcrcjk80A3h K6RW922kTjJzxiHOSteCS/k+AdcpgaAyVHulKDZ55eVftwfwJxVSuZVtF/N7YwNL qAyWk1Okcwo= =ZluL -----END PGP SIGNATURE-----