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关于Linux内核存在本地提权漏洞的风险提示

  • 2026-06-30 18:10:04
关于Linux内核存在本地提权漏洞的风险提示

1

漏洞详情及其修补方案

近期，Linux 内核被爆出存在Copy Fail、Dirty Frag、Fragnesia三个本地提权漏洞，利用门槛低、成功率高、影响范围广，由于国产操作系统厂商多数基于Linux二次开发，麒麟、统信等操作系统也受漏洞影响。

2

（一）Copy Fail 漏洞（CNVD-2026-19044）

漏洞简述: 为其加密子系统模块存在逻辑缺陷，可被利用向系统任意可读文件的页缓存写入受控字节，实现本地权限提升至root权限。

影响范围: 覆盖2017年以来几乎所有主流Linux 发行版

补丁链接：https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8

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（二）Dirty Frag 漏洞（CNVD-2026-21358、CNVD-2026-21360）

漏洞简述：为Linux 内核在网络栈中对页片段的复用和生命周期管理存在缺陷，在特定状态下允许用户态数据写入只读页，从而实现普通用户本地提权。

影响范围：包含Ubuntu 24.04.4 、RHEL 10.1 、openSUSE Tumbleweed 、CentOS Stream  10 、AlmaLinux  10 、Fedora 44 等主流版本。

补丁链接：https://git.kernel.org/stable/c/a6cb440f274a22456ef3e86b457344f1678f38f9 和https://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c

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（三）Fragnesia 漏洞（CNVD-2026-21361）

漏洞简述：是Linux 内核在处理共享的页片段时存在逻辑缺陷，导致本地低权限攻击者可篡改只读文件在内存页缓存中的内容，实现本地权限提升并获取root权限。

影响范围：包含Ubuntu 24.04.4 、RHEL 10.1 、openSUSE Tum bleweed 、CentOS  Stream  10 、AlmaLinux  10 、Fedora  44 等主流版本。

补丁链接：https://github.com/v12-security/pocs/tree/main/fragnesia

请各位师生排查Linux 、麒麟、统信等操作系统安装使用情况，及时采取内核升级或补丁修复措施消除网络安全隐患。

作者：杨达烨

责编：左子飞

审核：谭貌 胡洪波

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  1. CONNECT:[ UseTime:0.000773s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001268s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.021659s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.031783s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001756s ]
  6. SELECT * FROM `set` [ RunTime:0.016338s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001312s ]
  8. SELECT * FROM `article` WHERE `id` = 496184 LIMIT 1 [ RunTime:0.008170s ]
  9. UPDATE `article` SET `lasttime` = 1783006218 WHERE `id` = 496184 [ RunTime:0.030364s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.007476s ]
  11. SELECT * FROM `article` WHERE `id` < 496184 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007555s ]
  12. SELECT * FROM `article` WHERE `id` > 496184 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.059571s ]
  13. SELECT * FROM `article` WHERE `id` < 496184 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.101700s ]
  14. SELECT * FROM `article` WHERE `id` < 496184 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.224727s ]
  15. SELECT * FROM `article` WHERE `id` < 496184 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.057774s ]
0.773555s