Qualys最新的发现并且公布了linux漏洞“CVE-2015-0235”，对于绝大多数人来说这个漏洞都应该重视起来，受影响的系统有：Debian 7，CentOS 6 & 7，Ubuntu 12.04，不受影响的有：Fedora 20 & 21，Ubuntu 14.04 and 14.10，Arch，OpenSuse 13.2。debian7系统版本低于2.13-38+deb7u7的都是不安全的，ubuntu系统低于2.15-0ubuntu10.10同样是不安全的，自己来检查一下：

# aptitude show libc6
Package: libc6
State: installed
Automatically installed: no
Multi-Arch: same
Version: 2.13-38+deb7u6
Priority: required
Section: libs
Maintainer: GNU Libc Maintainers
Architecture: amd64
Uncompressed Size: 9,687 k
Depends: libc-bin (= 2.13-38+deb7u6), libgcc1
Suggests: glibc-doc, debconf | debconf-2.0, locales
Conflicts: prelink (<= 0.0.20090311-1), tzdata (< 2007k-1), tzdata-etchBreaks: locales (< 2.13), locales-all (< 2.13), lsb-core (<= 3.2-27), nscd (< 2.13)Replaces: libc6-amd64Provides: glibc-2.13-1Description: Embedded GNU C Library: Shared libraries Contains the standard libraries that are used by nearly all programs on the system. This package includes shared versions of the standard C library and the standard math library, as well as many others.Homepage: http://www.eglibc.orgcentos 7早于glibc-2.17-55.el7_0.5 以及centos 6 早于glibc-2.12-1.149.el6_6.5的都需要打补丁，下面的命令你会用到的：# yum info glibc....Installed PackagesName : glibcArch : x86_64Version : 2.17Release : 55.el7_0.1Size : 13 MRepo : installedFrom repo : updatesSummary : The GNU libc librariesURL : http://www.gnu.org/software/glibc/License : LGPLv2+ and LGPLv2+ with exceptions and GPLv2+Description : The glibc package contains standard libraries which are used by : multiple programs on the system. In order to save disk space and : memory, as well as to make upgrading easier, common system code is : kept in one place and shared between programs. This particular package : contains the most important sets of shared libraries: the standard C : library and the standard math library. Without these two libraries, a : Linux system will not function.打补丁办法很简单：debian：apt-get updateapt-get dist-upgradecentos和fedorayum clean allyum update