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漏洞预警 | Linux “Copy Fail” 内核提权漏洞(CVE-2026-31431)

  • 2026-06-28 22:40:15
漏洞预警 | Linux “Copy Fail” 内核提权漏洞(CVE-2026-31431)

🚨 漏洞预警 | Linux “Copy Fail” 内核提权漏洞(CVE-2026-31431—— 732字节通杀主流发行版,9年潜伏终爆发

发布时间:2026430

威胁等级:🔴 高危(CVSS 7.8

影响范围:2017年至今几乎所有Linux发行版


一、漏洞概述

2026429日,国际安全研究团队Theori / Xint Code公开披露了一个潜伏近9年的Linux内核本地提权漏洞 —— Copy FailCVE-2026-31431。该漏洞允许本地普通权限用户通过一段仅732字节Python脚本,在无需竞争条件、无需复杂偏移适配的情况下,稳定获取系统root 最高权限

国家信息安全漏洞共享平台(CNVD)已收录该漏洞(CNVD-2026-19044),并发布安全公告(CNTA-2026-0002)。安天公司已报告发现在野利用情况,威胁正在快速蔓延。


二、漏洞原理:三个合理优化的致命交集

Copy Fail 的根源并非单一编码错误,而是三个独立内核特性的意外组合:

变更

时间

初衷

副作用

AF_ALG 套接字

2011

向用户态暴露内核加密能力

普通用户无需特权即可创建加密会话

splice() 零拷贝

避免数据拷贝到用户态

可直接传递只读文件的页缓存引用

algif_aead 原地优化

2017

提升AEAD运算性能

只读页缓存页被当作可写输出缓冲区

攻击链路:攻击者利用splice()/usr/bin/su setuid 文件的页缓存送入AF_ALG加密管道,authencesn算法在处理过程中会向缓冲区越界写入4字节序列号,而这4字节恰好落入页缓存页面,实现对内存中可执行文件的篡改。由于写入的是页缓存而非磁盘文件,传统基于磁盘校验的完整性工具完全无法检测


三、漏洞特点:为何堪称十年来最优雅的提权漏洞

与历史上著名的 Dirty CowDirty Pipe 相比,Copy Fail 展现出更危险的特性:

✅ 无需竞争条件:直线型执行逻辑,一次执行必定成功

✅ 零偏移适配:同一份利用代码通杀 UbuntuRHELAmazon LinuxSUSE 等主流发行版

✅ 默认配置触发:依赖内核默认启用的加密API,无需特殊环境

✅ 跨容器影响:页缓存在宿主机范围内共享,可实现Kubernetes 容器逃逸

✅ 极致精简732字节 Python 脚本,利用门槛极低


四、影响范围

受影响内核版本20178月引入的 commit 72548b093ee3至修复补丁a664bf3d603d之前的所有版本。

已知受影响发行版 - Ubuntu 24.04 LTS 及以下 - Red Hat Enterprise Linux 8/9/10 - Amazon Linux 2023 - SUSE 16 / openSUSE - Debian 系列 - 几乎所有2017年后发布的Linux发行版

高风险场景 - 多用户Linux服务器 - Kubernetes / Docker 容器宿主机 - CI/CD 构建机与自托管 Runner - 云端 Notebook / 沙箱执行环境 - VPS 与云服务器


五、官方修复方案

方案一:升级内核(强烈推荐)

安全内核版本 - Linux Kernel 6.18 → 升级至6.18.22或更高 - Linux Kernel 6.19 → 升级至6.19.12或更高 - Linux Kernel 7.0 → 已包含修复

各发行版升级命令

# Debian / Ubuntu sudo apt update && sudo apt full-upgrade && sudo reboot # RHEL / Rocky / Alma / Fedora sudo dnf update kernel && sudo reboot # Amazon Linux 2023 sudo dnf update kernel && sudo reboot # SUSE / openSUSE sudo zypper refresh && sudo zypper patch && sudo reboot

验证修复

uname -r  # 确认运行内核版本

方案二:临时缓解措施

若无法立即重启,可临时禁用algif_aead模块阻断攻击路径:

echo "install algif_aead /bin/false" | sudo tee /etc/modprobe.d/disable-algif.conf sudo rmmod algif_aead 2>/dev/null || true

验证模块是否禁用

lsmod | grep '^algif_aead'  # 无输出即为成功

⚠️ 注意:临时缓解仅适用于无法立即重启的场景,升级内核并重启才是根本解决方案


六、检测与自查建议

1.版本自查:执行uname -r查看内核版本,对照官方安全公告确认是否在受影响范围

2.模块检查:执行lsmod | grep algif_aead,若已加载则存在风险

3.日志监控:关注异常AF_ALG套接字创建和splice()调用行为

4.完整性监控:虽然页缓存篡改不触发磁盘事件,但可监控/usr/bin/su等关键 setuid 文件的异常执行


七、安全建议

场景

处置优先级

建议动作

单用户个人服务器

🟡 尽快修复

安排维护窗口升级内核

多用户/多租户主机

🔴 立即修复

紧急升级,无法升级则立即禁用模块

Kubernetes   节点

🔴 立即修复

逐节点滚动升级,优先 Master 节点

CI/CD   Runner

🔴 立即修复

暂停不可信代码执行,升级后再恢复

容器平台/云主机

🔴 立即修复

联系云服务商确认底层内核修复状态


八、时间线回顾

日期

事件

20178

内核提交72548b093ee3引入原地操作优化(漏洞引入)

2026323

Theori 研究员向 Linux 内核安全团队报告漏洞

202641

修复补丁合并至 Linux 主线内核

2026422

CVE-2026-31431   正式分配

2026429

公开披露,PoC 代码发布

2026430

各主流发行版推送补丁,CNVD/CNCERT 发布安全公告


九、结语

Copy Fail 再次证明:本地提权漏洞绝非低危。在现代云原生架构中,Web RCE、供应链攻击、恶意依赖包、容器逃逸链等都可能成为前置条件,将本地变为可达。一个732字节的脚本,足以让攻击者从普通用户跃升为系统主宰。


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  1. CONNECT:[ UseTime:0.001209s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001541s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005282s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001292s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001434s ]
  6. SELECT * FROM `set` [ RunTime:0.000723s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001591s ]
  8. SELECT * FROM `article` WHERE `id` = 490596 LIMIT 1 [ RunTime:0.005864s ]
  9. UPDATE `article` SET `lasttime` = 1783082235 WHERE `id` = 490596 [ RunTime:0.033279s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000950s ]
  11. SELECT * FROM `article` WHERE `id` < 490596 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009836s ]
  12. SELECT * FROM `article` WHERE `id` > 490596 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011701s ]
  13. SELECT * FROM `article` WHERE `id` < 490596 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012508s ]
  14. SELECT * FROM `article` WHERE `id` < 490596 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.019306s ]
  15. SELECT * FROM `article` WHERE `id` < 490596 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.058072s ]
0.365621s