CVE:CVE-2021-28691
CNNVD:CNNVD-202106-479
Xen是英国剑桥（Cambridge）大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。
Xen 存在安全漏洞，该漏洞源于使用xen-netback组件的xenvif_connect_data()方法可以强制使用释放的内存区域。在客户系统内的攻击者可利用该漏洞触发拒绝服务，并可能在主机系统上运行代码。
solution:Upgrade linux linux_kernel to a higher version than 5.12.2,and avoid the version [5.5.0,5.12.2); Upgrade netapp cloud_backup to a higher version than -; Upgrade netapp h410c_firmware to a higher version than -; Upgrade netapp h300s_firmware to a higher version than -; Upgrade netapp h500s_firmware to a higher version than -; Upgrade netapp h700s_firmware to a higher version than -; Upgrade netapp h300e_firmware to a higher version than -; Upgrade netapp h500e_firmware to a higher version than -; Upgrade netapp h700e_firmware to a higher version than -; Upgrade netapp h410s_firmware to a higher version than -