kernel-4.19 存在漏洞代码，请及时更新补丁

漏洞编号： CVE-2021-3493

涉及主要文件及行号
Source/kernel-kernel-4.19/fs/xattr.c@setxattr (503 - 546)
Source/kernel-kernel-4.19/fs/xattr.c@vfs_setxattr (260 - 280)

源码版本：kernel-4.19分支

漏洞简述：
linux kernel 存在安全漏洞，该漏洞源于非特权用户名称空间和Ubuntu内核中允许非特权覆盖的补丁的组合，攻击者可利用该漏洞可以使用它来获得更高的特权。

Hi qianxin-open-source-guard, welcome to the openEuler Community.
I'm the Bot here serving you. You can find the instructions on how to interact with me at
https://gitee.com/openeuler/community/blob/master/en/sig-infrastructure/command.md.
If you have any questions, please contact the SIG: Kernel, and any of the maintainers: @Xie XiuQi, @YangYingliang, @成坚 (CHENG Jian).

CVE-2021-3493 已经提单跟踪过，经分析该漏洞对openEuler无影响，详见如下链接，本问题单非问题关闭。
#I3QYDS:CVE-2021-3493

GVP openEuler / kernel