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CVE-2026-31431 Linux 内核 Copy Fail 本地提权漏洞

  • 2026-07-01 04:09:18
CVE-2026-31431 Linux 内核 Copy Fail 本地提权漏洞

>>>漏洞名称:

Linux 内核 Copy Fail 本地提权漏洞(CVE-2026-31431)

>>>组件名称:

Linux

>>>漏洞类型:

本地提权

>>>利用条件:

1.用户认证:需要一个普通的本地账户

2.前置条件:无

3.触发方式:本地触发

>>>综合评定利用难度:

简单

>>>综合评定威胁等级:

漏洞描述

1

组件介绍

Linux Kernel 是全球最广泛使用的开源操作系统内核,它是 Linux 系统的核心组件,负责管理硬件资源、进程调度、内存管理、文件系统和网络功能等底层任务。

2

漏洞描述/分析

algif_aead.c 在对 authencesn 模板执行原地(in-place)AEAD 解密时,将通过 splice() 引入的页面缓存页链入了可写scatterlist。authencesn 在解密过程中会向 dst[assoclen + cryptlen] 处写入 4 字节暂存数据,导致该写操作越界落入目标文件的页面缓存。本地非特权用户可借此对任意可读文件的内存缓存执行精确的 4 字节受控写入,且被篡改的页面不会被标记为脏页,磁盘文件保持不变,完整性检测无法发现。攻击者可利用此原语向 setuid 二进制文件注入代码,实现本地提权至 root。

影响范围

1.  受影响内核版本:

  • 包含 commit 72548b093ee3(2017 年引入)至 commit a664bf3d603d(2026 年 3 月 31 日修复)之间的所有 Linux 系统

2. 受影响发行版:

  • Ubuntu:24.04 LTS 及以下版本

  • RedHat:RHEL 8/9/10 及以下版本、CentOS、Rocky、Alma、Oracle Linux 。

  • 其他:Amazon Linux 2023 及以下、SUSE 16 及以下、Debian、Fedora、Arch、openEuler 等

修复建议

1

官方修复建议

官方已发布漏洞补丁及修复版本,https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5

2

青藤产品解决方案

(1)万相主机自适应安全平台「风险发现-漏洞检测」

(2)蜂巢云原生安全平台「应用风险-应用漏洞」

(3)青藤深睿云工作负载安全平台V5「风险发现-风险分析-主机风险/容器风险-漏洞」

(4)青藤深睿终端安全管理系统V5 「风险发现-风险分析-主机风险/容器风险-漏洞」

参考链接

https://nvd.nist.gov/vuln/detail/cve-2026-31431

https://copy.fail/

漏洞时间线

2026年4月29日

国际安全研究团队Theori的研究员Taeyang Lee正式公开了代号为Copy Fail的Linux内核高危漏洞,官方编号CVE-2026-31431

2026年4月30日

青藤复现漏洞

-完-

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  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=9e4fa8fa063de4f5e65da2bf6bbb9efd
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  1. CONNECT:[ UseTime:0.000989s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001869s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000767s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000656s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001520s ]
  6. SELECT * FROM `set` [ RunTime:0.000599s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001795s ]
  8. SELECT * FROM `article` WHERE `id` = 492507 LIMIT 1 [ RunTime:0.008583s ]
  9. UPDATE `article` SET `lasttime` = 1783091606 WHERE `id` = 492507 [ RunTime:0.034956s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.056232s ]
  11. SELECT * FROM `article` WHERE `id` < 492507 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.020109s ]
  12. SELECT * FROM `article` WHERE `id` > 492507 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005005s ]
  13. SELECT * FROM `article` WHERE `id` < 492507 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.044094s ]
  14. SELECT * FROM `article` WHERE `id` < 492507 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002056s ]
  15. SELECT * FROM `article` WHERE `id` < 492507 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.015792s ]
0.305209s