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CVE-2026-31431:Linux内核“Copy Fail”提权漏洞

  • 2026-06-30 09:40:18
CVE-2026-31431:Linux内核“Copy Fail”提权漏洞

⚠️高危预警

     2026年4月29日,一个影响范围极广的Linux本地提权漏洞 CVE-2026-31431(代号Copy Fail)被公开披露。攻击者仅需一个普通用户权限,就能稳定获得root权限,整个过程无需竞争窗口、无需内核偏移、无需特殊工具

受影响时间跨度2017年 ~ 2026年4月补丁发布前 —— 8年的所有Linux内核版本。

影响场景

·任意Linux服务器、工作站

·容器环境(Kubernetes/Docker):容器内攻击者可逃逸至宿主机

·CI/CD RunnerGitHub Actions、GitLab CI等):恶意PR可拿下Runner宿主机

·云多租户环境Notebook、Serverless等):租户可提权为宿主机root

处置优先级:极高


漏洞根源:一个2017年引入的逻辑缺陷

1

      漏洞位于Linux内核加密子系统的 authencesn 模块。2017年,为了优化AEAD(认证加密)操作的性能,开发者引入了一个“原地(in-place)”处理逻辑。但该优化存在一处致命缺陷:在某些条件下,本应是只读的页缓存(page cache)页面,被错误地放入了可写的散列表(scatterlist)

攻击者通过组合两个系统调用:

·AF_ALG 套接字(暴露内核加密API)

·splice()(零拷贝数据传输)

即可触发漏洞,对任意只读文件(如 /usr/bin/su 这样的setuid程序)的页缓存进行4字节任意写入。篡改程序逻辑后,运行该程序就能获得root shell。

利用成熟度EXP已公开,仅732字节,100%稳定复现。实测演示如下:

https://via.placeholder.com/600x200?text=%5B%E6%BC%8F%E6%B4%9E%E5%A4%8D%E7%8E%B0%E5%8A%A8%E5%9B%BE/%E6%88%AA%E5%9B%BE%5D


影响版本:自查你的系统是否中招

2

发行版

受影响内核版本(示例)

Ubuntu 24.04 LTS

6.17.0-1007-aws 及以下

Amazon Linux 2023

6.18.8-9.213.amzn2023 及以下

RHEL 14.3

6.12.0-124.45.1.el10_1 及以下

SUSE 16

6.12.0-160000.9-default 及以下

Debian / Arch / Fedora / Rocky / Alma / Oracle

同期内核版本均受影响

通用判断:如果你的Linux内核是在2017年至2026年4月29日之间构建的,大概率存在漏洞。


修复方案:立即行动

3

方案一:升级内核(推荐)

各大发行版已陆续发布修复补丁(包含mainline commit a664bf3d603d)。

bash

# Ubuntu / Debian

sudo apt update && sudo apt upgrade linux-image-$(uname -r)

# RHEL / CentOS / Rocky / Alma

sudo dnf update kernel

# Amazon Linux

sudo yum update kernel

# SUSE

sudo zypper update kernel-default

升级后务必重启系统,使新内核生效。

验证是否已修复:

bash

uname -r   # 对比发行版公告中的修复版本号

# 或

grep -r "a664bf3d603d" /proc/version

方案二:临时缓解(无法重启时)

禁用 algif_aead 内核模块,阻断漏洞利用路径。

bash

# 立即卸载(当前会话生效)

sudo rmmod algif_aead 2>/dev/null || true

# 永久禁用(重启后仍生效)

echo "install algif_aead /bin/false" | sudo tee /etc/modprobe.d/disable-algif.conf

禁用影响评估

·不影响dm-crypt/LUKS、kTLS、IPsec/XFRM、OpenSSL默认构建、SSH、内核密钥环加密

·⚠️可能影响:显式使用 afalg 引擎的OpenSSL、部分嵌入式加密卸载路径、直接绑定AEAD套接字的应用

检查当前是否有进程使用 AF_ALG:

bash

lsof | grep AF_ALG   # 或 ss -xa | grep alg

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  1. CONNECT:[ UseTime:0.000820s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000924s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000358s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000278s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000477s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000592s ]
  8. SELECT * FROM `article` WHERE `id` = 493118 LIMIT 1 [ RunTime:0.000460s ]
  9. UPDATE `article` SET `lasttime` = 1783082791 WHERE `id` = 493118 [ RunTime:0.013678s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000228s ]
  11. SELECT * FROM `article` WHERE `id` < 493118 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000433s ]
  12. SELECT * FROM `article` WHERE `id` > 493118 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004462s ]
  13. SELECT * FROM `article` WHERE `id` < 493118 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000928s ]
  14. SELECT * FROM `article` WHERE `id` < 493118 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000716s ]
  15. SELECT * FROM `article` WHERE `id` < 493118 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000669s ]
0.133799s