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Dirty Frag:一款全新 Linux 提权漏洞已在野外曝光

  • 2026-07-02 08:34:24
Dirty Frag:一款全新 Linux 提权漏洞已在野外曝光

安全研究人员披露了Linux 内核一处全新未修复漏洞,代号 Dirty Frag。该漏洞允许本地低权限用户在主流 Linux 发行版中直接获取完整 Root 权限,受影响系统包括 Ubuntu、RHEL、Fedora、AlmaLinux 以及 CentOS Stream。

Dirty Frag 隶属于 Dirty Pipe 漏洞家族,但不受 Copy Fail 漏洞缓解措施的防护。也就是说,即便系统已部署 algif_aead 黑名单防护策略,仍会完全暴露在该漏洞风险之下。

安全公告中写道:“攻击者可通过链式利用 xfrm-ESP 页缓存写入漏洞与 RxRPC 页缓存写入漏洞,在主流 Linux 发行版上获取 Root 权限。Dirty Frag 拓展了 Dirty Pipe、Copy Fail 所属的漏洞类型范畴。该漏洞属于确定性逻辑漏洞,无需依赖时间窗口、不存在竞态条件;漏洞利用失败时不会触发内核宕机,且攻击成功率极高。”

该漏洞由安全研究员 Hyunwoo Kim(账号 @v4bel)首次对外披露。

此漏洞为双漏洞链式组合利用:第一个是 xfrm-ESP 页缓存写入漏洞,根源位于 Linux IPsec 子系统,由 2017 年 1 月的一次代码提交引入,此次提交同时也造成了 CVE-2022-27666 缓冲区溢出漏洞,影响多款 Linux 发行版。第二个是 RxRPC 页缓存写入漏洞,于 2023 年 6 月被引入内核。

两个漏洞单独利用均无法适配所有系统,但组合后可互相弥补环境短板:当其中一条利用路径被环境限制拦截(例如 Ubuntu 的 AppArmor 限制用户命名空间创建)时,另一条路径仍可正常利用。这种链式特性让 Dirty Frag 对各大 Linux 发行版均具备普遍威胁性。

技术分析指出:“两个漏洞的共性原理为:在零拷贝发送路径中,splice() 会将攻击者仅有只读权限的页缓存页面引用,直接存入发送端套接字缓冲区的分片槽位;随后接收端内核会对该分片执行原地加密运算。最终,低权限用户仅有读取权限的文件页缓存(如 /etc/passwd/usr/bin/su)会在内存中被篡改,后续所有读取操作都会加载被篡改的文件副本。”

Dirty Frag 的高危性还体现在利用稳定性上:不同于多数依赖精准时间窗口、竞态条件的内核漏洞利用程序,该漏洞是确定性逻辑漏洞,利用失败不会导致内核崩溃,且成功率极高。目前可直接运行的概念验证 EXP 已公开,仅需一条命令即可完成漏洞利用。

本次漏洞披露过程存在波折:第三方机构未经过协调,提前公开了详细技术细节与漏洞利用代码,打破了官方保密协议。目前该漏洞暂未分配 CVE 编号

报告总结称:“将两类漏洞链式组合可实现环境短板互补。在允许创建用户命名空间的环境中,可优先利用 ESP 漏洞;而在 Ubuntu 等禁用用户命名空间、但内置编译 rxrpc.ko 模块的系统上,RxRPC 漏洞利用方式依然生效。”

在官方补丁发布前,临时防护建议:将 esp4esp6rxrpc 内核模块加入黑名单,禁止其加载运行。

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  1. CONNECT:[ UseTime:0.000665s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000976s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.017792s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000330s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000716s ]
  6. SELECT * FROM `set` [ RunTime:0.005572s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000835s ]
  8. SELECT * FROM `article` WHERE `id` = 492393 LIMIT 1 [ RunTime:0.003061s ]
  9. UPDATE `article` SET `lasttime` = 1783043196 WHERE `id` = 492393 [ RunTime:0.031527s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.007850s ]
  11. SELECT * FROM `article` WHERE `id` < 492393 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005796s ]
  12. SELECT * FROM `article` WHERE `id` > 492393 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009090s ]
  13. SELECT * FROM `article` WHERE `id` < 492393 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005790s ]
  14. SELECT * FROM `article` WHERE `id` < 492393 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001860s ]
  15. SELECT * FROM `article` WHERE `id` < 492393 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002119s ]
0.164373s