CVE:CVE-2015-7513
CNNVD:CNNVD-201601-300
Linux kernel是美国Linux基金会发布的开源操作系统Linux所使用的内核。NFSv4 implementation是其中的一个分布式文件系统协议。
Linux kernel 4.4之前版本的arch/x86/kvm/x86.c文件中存在安全漏洞，该漏洞源于程序在状态恢复期间没有限制PIT计数器。虚拟机端攻击者可借助零值利用该漏洞造成拒绝服务（除零错误和主机操作系统崩溃）。
solution:Upgrade linux linux_kernel to a higher version than 4.4,4.4,4.4:rc1,4.4:rc2,4.4:rc3,4.4:rc4,4.4:rc5,4.4:rc6,and avoid the version (,4.4),4.4,4.4:rc1,4.4:rc2,4.4:rc3,4.4:rc4,4.4:rc5,4.4:rc6; Upgrade debian debian_linux to a higher version than 7.0,8.0,and avoid the version 7.0,8.0; Upgrade fedoraproject fedora to a higher version than 22,23,and avoid the version 22,23; Upgrade canonical ubuntu_linux to a higher version than 12.04,14.04,15.04,15.10,and avoid the version 12.04,14.04,15.04,15.10