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【漏洞复现】Linux内核Fragnesia权限提升通杀漏洞(CVE-2026-46300)

  • 2026-06-29 15:31:21
【漏洞复现】Linux内核Fragnesia权限提升通杀漏洞(CVE-2026-46300)
本文只做技术研究，请遵守相关法律法规，切勿非法测试，所产生的后果需自行承担，如有侵权，请联系删除。

漏洞描述

Linux 内核 XFRM ESP-in-TCP 子系统存在内存处理逻辑缺陷，因合并 skb 共享页碎片时未正确校验并传递共享页标记，恶意本地用户可通过构造特殊网络数据包触发内存越界读写，利用页缓存只读页篡改机制实现本地权限提升，无需高权限前置条件，利用门槛低、稳定性强，危害风险极高。

影响版本

2026 年 5 月 13 日之前发布的所有 Linux 内核版本 均受此漏洞影响。

漏洞复现

执行命令

gcc -o exp fragnesia.c && ./exp./exp

修复建议

  1. 尽快将 Linux 内核升级至2026 年 5 月 13 日及以后官方修复版本，同步发行版官方安全补丁。
  2. 临时防护：禁用 espintcp 相关内核模块，限制普通用户网络命名空间创建及网络配置权限。

exp获取

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  1. CONNECT:[ UseTime:0.000585s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000791s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000318s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000278s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000479s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000621s ]
  8. SELECT * FROM `article` WHERE `id` = 493688 LIMIT 1 [ RunTime:0.000365s ]
  9. UPDATE `article` SET `lasttime` = 1783067998 WHERE `id` = 493688 [ RunTime:0.013637s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000231s ]
  11. SELECT * FROM `article` WHERE `id` < 493688 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000641s ]
  12. SELECT * FROM `article` WHERE `id` > 493688 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000427s ]
  13. SELECT * FROM `article` WHERE `id` < 493688 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004632s ]
  14. SELECT * FROM `article` WHERE `id` < 493688 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011430s ]
  15. SELECT * FROM `article` WHERE `id` < 493688 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006253s ]
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