当前位置：首页>Linux>【已复现】Linux Kernel ＂Copy Fail＂ 本地权限提升漏洞(CVE-2026-31431)安全风险通告

【已复现】Linux Kernel ＂Copy Fail＂ 本地权限提升漏洞(CVE-2026-31431)安全风险通告

  • 2026-06-28 14:28:04
【已复现】Linux Kernel ＂Copy Fail＂ 本地权限提升漏洞(CVE-2026-31431)安全风险通告

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漏洞概述

漏洞名称

Linux Kernel 本地权限提升漏洞

漏洞编号

QVD-2026-21755，CVE-2026-31431

公开时间

2026-04-22

影响量级

百万级

奇安信评级

高危

CVSS 3.1分数

7.8

威胁类型

权限提升

利用可能性

高

POC状态

已公开

在野利用状态

未发现

EXP状态

已公开

技术细节状态

已公开

危害描述：攻击者可以利用 AF_ALG 加密接口与 splice() 系统调用的组合，向任意可读文件的页缓存写入受控的4字节数据，从而篡改 setuid 程序，无需竞争条件即可直接获得 root 权限。

01
漏洞详情
>>>>

影响组件

Linux 内核是一款开源的类 UNIX 操作系统内核，作为 Linux 系统的核心组件，负责管理系统硬件资源、进程调度、内存管理、文件系统与网络通信等核心功能，为各类应用程序提供底层支撑与系统调用接口。其广泛应用于服务器、桌面终端、移动设备、嵌入式系统与云计算环境，是全球主流 IT 基础设施的核心运行载体，具备高稳定性、高可移植性与高扩展性，支持多架构、多任务与多用户并发运行，支撑着互联网、金融、政企、云计算等关键领域的业务系统稳定运转。

>>>>

漏洞描述

近日，奇安信CERT监测到官方修复Linux Kernel 本地权限提升漏洞(CVE-2026-31431)，该漏洞源于内核加密子系统中的一处逻辑缺陷，攻击者可以利用 AF_ALG 加密接口与 splice() 系统调用的组合，向任意可读文件的页缓存写入受控的4字节数据，从而篡改 setuid 程序，无需竞争条件即可直接获得 root 权限。目前该漏洞PoC和技术细节已公开。鉴于该漏洞影响范围较大，建议客户尽快做好自查及防护。
02
影响范围
>>>>

影响版本

72548b093ee3 <= commit < a664bf3d603d
目前已知受影响版本：
Ubuntu 24.04 LTS
Amazon Linux 2023
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 9
Red Hat Enterprise Linux 8
SUSE 16
>>>>

其他受影响组件

无

03
复现情况

目前，奇安信威胁情报中心安全研究员已成功复现Linux Kernel 本地权限提升漏洞(CVE-2026-31431)，截图如下：

04
处置建议
>>>>

安全更新

官方已发布补丁，请根据您的内核版本升级至以下安全版本：
Linux Kernel 6.18: 升级至 6.18.22 或更高版本
https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8
Linux Kernel 6.19: 升级至 6.19.12 或更高版本
https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237
Linux Kernel 7.0: 升级至 7.0 (或应用相关补丁)
https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5
旧版本内核：请应用官方 Commit a664bf3d603d (Revert to operating out-of-place)。
05
参考资料

[1]https://www.openwall.com/lists/oss-security/2026/04/29/23

[2]https://github.com/theori-io/copy-fail-CVE-2026-31431

[3]https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5

[4]https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237

[5]https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8

06
时间线

2026年04月30日，奇安信 CERT发布安全风险通告。

07
漏洞情报服务

奇安信ALPHA威胁分析平台已支持漏洞情报订阅服务：

奇安信 CERT
致力于第一时间为企业级用户提供权威漏洞情报和有效解决方案。

点击↓阅读原文，到ALPHA威胁分析平台订阅更多漏洞信息。

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  1. CONNECT:[ UseTime:0.000490s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000570s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000290s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006137s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000613s ]
  6. SELECT * FROM `set` [ RunTime:0.000245s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000553s ]
  8. SELECT * FROM `article` WHERE `id` = 490540 LIMIT 1 [ RunTime:0.003156s ]
  9. UPDATE `article` SET `lasttime` = 1783090604 WHERE `id` = 490540 [ RunTime:0.009973s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000583s ]
  11. SELECT * FROM `article` WHERE `id` < 490540 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004036s ]
  12. SELECT * FROM `article` WHERE `id` > 490540 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002923s ]
  13. SELECT * FROM `article` WHERE `id` < 490540 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010301s ]
  14. SELECT * FROM `article` WHERE `id` < 490540 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004703s ]
  15. SELECT * FROM `article` WHERE `id` < 490540 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013737s ]
0.127928s