Test ID:	1.3.6.1.4.1.25623.1.0.882245
Category:	CentOS Local Security Checks
Title:	CentOS Update for kernel CESA-2015:1623 centos6
Summary:	Check the version of kernel
Description:	Summary: Check the version of kernel Vulnerability Insight: The kernel 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) This update also fixes the following bugs: * When removing a directory, and a reference was held to that directory by a reference to a negative child dentry, the directory dentry was previously not killed. In addition, once the negative child dentry was killed, an unlinked and unused dentry was present in the cache. As a consequence, deadlock could be caused by forcing the dentry eviction while the file system in question was frozen. With this update, all unused dentries are unhashed and evicted just after a successful directory removal, which avoids the deadlock, and the system no longer hangs in the aforementioned scenario. (BZ#1243400) * Due to the broken s_umount lock ordering, a race condition occurred when an unlinked file was closed and the sync (or syncfs) utility was run at the same time. As a consequence, deadlock occurred on a frozen file system between sync and a process trying to unfreeze the file system. With this update, sync (or syncfs) is skipped on a frozen file system, and deadlock no longer occurs in the aforementioned situation. (BZ#1243404) * Previously, in the scenario when a file was opened by file handle (fhandle) with its dentry not present in dcache ('cold dcache') and then making use of the unlink() and close() functions, the inode was not freed upon the close() system call. As a consequence, the iput() final was delayed indefinitely. A patch has been provided to fix this bug, and the inode is now freed as expected. (BZ#1243406) * Due to a corrupted Executable and Linkable Format (ELF) header in the /proc/vmcore file, the kdump utility failed to provide any information. The underlying source code has been patched, and kdump now provides debugging information for kernel crashes as intended. (BZ#1245195) * Previously, running the multipath request queue caused regressions in cases where paths failed regularly under I/O load. This regression manifested as I/O stalls that exceeded 300 seconds. This update reverts the changes aimed to reduce running the multipath request queue resulting in I/O stalls completing in a timely manner. (BZ#1246095) All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect. Affected Software/OS: kernel on CentOS 6 Solution: Please install the updated packages. CVSS Score: 7.8 CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2015-5364 BugTraq ID: 75510 http://www.securityfocus.com/bid/75510 Debian Security Information: DSA-3313 (Google Search) http://www.debian.org/security/2015/dsa-3313 Debian Security Information: DSA-3329 (Google Search) http://www.debian.org/security/2015/dsa-3329 https://twitter.com/grsecurity/status/605854034260426753 http://www.openwall.com/lists/oss-security/2015/06/30/13 RedHat Security Advisories: RHSA-2015:1623 http://rhn.redhat.com/errata/RHSA-2015-1623.html RedHat Security Advisories: RHSA-2015:1778 http://rhn.redhat.com/errata/RHSA-2015-1778.html RedHat Security Advisories: RHSA-2015:1787 http://rhn.redhat.com/errata/RHSA-2015-1787.html RedHat Security Advisories: RHSA-2016:0045 http://rhn.redhat.com/errata/RHSA-2016-0045.html RedHat Security Advisories: RHSA-2016:1096 http://rhn.redhat.com/errata/RHSA-2016-1096.html RedHat Security Advisories: RHSA-2016:1100 http://rhn.redhat.com/errata/RHSA-2016-1100.html RedHat Security Advisories: RHSA-2016:1225 https://access.redhat.com/errata/RHSA-2016:1225 http://www.securitytracker.com/id/1032794 SuSE Security Announcement: SUSE-SU-2015:1224 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00023.html SuSE Security Announcement: SUSE-SU-2015:1324 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00049.html SuSE Security Announcement: SUSE-SU-2015:1478 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00004.html SuSE Security Announcement: SUSE-SU-2015:1487 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00007.html SuSE Security Announcement: SUSE-SU-2015:1488 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00008.html SuSE Security Announcement: SUSE-SU-2015:1489 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00009.html SuSE Security Announcement: SUSE-SU-2015:1490 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00010.html SuSE Security Announcement: SUSE-SU-2015:1491 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00011.html SuSE Security Announcement: SUSE-SU-2015:1592 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00018.html SuSE Security Announcement: SUSE-SU-2015:1611 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00021.html SuSE Security Announcement: openSUSE-SU-2015:1382 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00011.html http://www.ubuntu.com/usn/USN-2680-1 http://www.ubuntu.com/usn/USN-2681-1 http://www.ubuntu.com/usn/USN-2682-1 http://www.ubuntu.com/usn/USN-2683-1 http://www.ubuntu.com/usn/USN-2684-1 http://www.ubuntu.com/usn/USN-2713-1 http://www.ubuntu.com/usn/USN-2714-1 Common Vulnerability Exposure (CVE) ID: CVE-2015-5366
Copyright	Copyright (C) 2015 Greenbone AG

This is only one of 145615 vulnerability tests in our test suite. Find out more about running a complete security audit. To run a free test of this vulnerability against your system, register below.