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新的Bad Epoll零日漏洞允许Linux服务器和安卓设备获得root权限

  • 2026-07-06 19:57:03
新的Bad Epoll零日漏洞允许Linux服务器和安卓设备获得root权限

漏洞概述

2026年7月,安全研究员Jaeyoung Chung公开了一个编号为CVE-2026-46242的Linux内核本地提权漏洞,并将其命名为“Bad Epoll”。该漏洞CVSS评分为7.8(高危),允许无特权的本地用户在Linux服务器、桌面系统及Android设备上将权限提升至root

技术细节

Bad Epoll是一个位于内核epoll(eventpoll)子系统中的释放后重用(Use-After-Free, UAF)漏洞。具体问题出在ep_remove()函数中:该函数在file->f_lock锁保护下清除了file->f_ep指针,但随后仍在同一临界区内继续使用该文件对象执行hlist_del_rcu()spin_unlock()操作

此时,若另一个CPU核心上的__fput()调用恰好观察到这一瞬时的NULL值,便会跳过eventpoll_release_file()的正常清理路径,直接执行f_op->release,从而释放一个仍在被使用的struct eventpoll对象。由于struct file类型标记为SLAB_TYPESAFE_BY_RCU,被释放的内存槽位可被alloc_empty_file()重新回收利用,攻击者可借此触发针对错误slab缓存的kmem_cache_free(),最终实现内核内存的任意读写

该漏洞的竞态窗口仅约6条机器指令。但Chung的利用程序通过巧妙构造——使用四个epoll对象分为两组,一组触发竞态、另一组成为受害对象——将8字节的UAF写入转化为针对文件对象的跨缓存攻击,再通过/proc/self/fdinfo实现内核内存任意读取,最终以ROP链劫持控制流获取root shell。在测试环境中,该利用程序成功率高达约99%

影响范围与危险特性

该漏洞影响Linux内核6.4及以上版本(已打补丁的版本除外),基于6.1内核的系统(如Pixel 8等设备)不受影响

Bad Epoll的严重性体现在两个方面:

其一,可影响Android系统。 历史上仅有极少数Linux内核漏洞能够在Android平台上实现root提权。kernelCTF收录的约130个可利用漏洞中,真正能提取Android root权限的仅约10个,Bad Epoll正是其中之一

其二,可从Chrome渲染器沙箱内触发。 这意味着攻击者可将浏览器渲染器漏洞与Bad Epoll链式组合,实现从沙箱逃逸到完整内核代码执行

由于epoll是Linux的核心I/O事件通知机制,无法被禁用或卸载,因此不存在有效的临时缓解措施

发现始末:AI审计的边界

一个颇具戏剧性的背景是:Bad Epoll所在的同一段约2500行的epoll代码路径,此前已被Anthropic公司的前沿AI模型Mythos审查过。Mythos确实在该代码中发现了另一个竞态条件漏洞(CVE-2026-43074),但却遗漏了Bad Epoll

Chung分析认为,Mythos未能发现Bad Epoll的原因可能有两个:其一,竞态窗口极小,即使盯着代码也难以推演确切的事件序列;其二,该漏洞在运行时几乎不留痕迹——修复CVE-2026-43074后,Bad Epoll的内存错误通常不会触发KASAN(内核的主要内存错误检测器)

修复建议

上游修复补丁(commit a6dc643c6931)已于2026年4月24日合入Linux内核主线。各Linux发行版(Red Hat、SUSE、Debian、Canonical、Amazon等)已陆续发布安全公告唯一可靠的防护措施是及时更新包含修复补丁的内核版本

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  1. CONNECT:[ UseTime:0.000541s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000596s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006352s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003502s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000696s ]
  6. SELECT * FROM `set` [ RunTime:0.000338s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000581s ]
  8. SELECT * FROM `article` WHERE `id` = 503775 LIMIT 1 [ RunTime:0.002111s ]
  9. UPDATE `article` SET `lasttime` = 1783351047 WHERE `id` = 503775 [ RunTime:0.007361s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000762s ]
  11. SELECT * FROM `article` WHERE `id` < 503775 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000586s ]
  12. SELECT * FROM `article` WHERE `id` > 503775 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000428s ]
  13. SELECT * FROM `article` WHERE `id` < 503775 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003721s ]
  14. SELECT * FROM `article` WHERE `id` < 503775 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003630s ]
  15. SELECT * FROM `article` WHERE `id` < 503775 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010623s ]
0.110903s