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CVE-2026-31431 Linux 内核提权漏洞修复指南

  • 2026-07-03 03:08:14
CVE-2026-31431 Linux 内核提权漏洞修复指南
一、漏洞概述

CVE-2026-31431(代号:Copy Fail)是 Linux Kernel 中一个高危本地提权漏洞,攻击者可利用该漏洞从普通用户权限直接提升为 root漏洞影响 Linux 2017 年以来的大量内核版本,已经被确认存在真实攻击利用。 

漏洞核心影响组件:

  • algif_aead
  • AF_ALG
  • Linux Crypto API
  • splice()
     系统调用

攻击者可:

  • 本地提权为 root
  • 容器逃逸
  • Kubernetes 节点突破
  • CI/CD Runner 提权
  • 篡改 setuid 程序

受影响发行版包括:

  • Red Hat Enterprise Linux
  • Ubuntu
  • SUSE Linux Enterprise
  • Amazon Linux
  • Debian
  • Kylin
    (理论上受影响)

二、漏洞影响范围

已确认受影响:

Linux Kernel >=4.14

存在风险时间范围:

2017-08-09 ~ 2026-03-31

漏洞源于:

commit 72548b093ee3

修复提交:

commit a664bf3d603d

三、风险等级

CVSS:

CVSS=7.8CVSS=7.8CVSS=7.8

风险等级:

高危(High)

特点:

项目
描述
是否需要本地账号
是否需要 sudo
是否需要交互
是否容易利用
极高
是否存在公开 PoC
已公开
是否存在真实攻击
已确认

四、漏洞检测方法

1. 查看内核版本

uname -r

例如:

5.14.0-503.el9.x86_64

若未升级到厂商最新安全版本,则存在风险。


2. 检查模块是否加载

lsmod | grep algif_aead

若输出:

algif_aead

说明存在攻击面。


3. 检查 AF_ALG 是否启用

grep CONFIG_CRYPTO_USER_API /boot/config-$(uname -r)

若:

CONFIG_CRYPTO_USER_API=y

说明支持 AF_ALG。


4. 检查是否已修复

Red Hat:

rpm -q--changelog kernel | grep CVE-2026-31431

Ubuntu:

apt changelog linux-image-$(uname -r) | grep 31431

五、Linux 修复方案(推荐)

方案一:升级内核(官方推荐)

这是最安全的方法。


Red Hat / Rocky / AlmaLinux

更新:

dnf update kernel -y

重启:

reboot

确认:

uname -r

Ubuntu

apt updateapt upgrade linux-image-generic -yreboot

Debian

apt updateapt full-upgrade -yreboot

麒麟(Kylin V10)

国产系统建议:

yum update kernel -y

或:

dnf update kernel -y

查看安全公告:

  • 银河麒麟安全中心
  • 厂商 HOTFIX

六、临时缓解方案(未能立即升级)

如果生产环境无法立即重启,可先临时缓解。


方案1:禁用 algif_aead 模块

卸载:

modprobe -r algif_aead

永久禁用:

echo "blacklist algif_aead" > /etc/modprobe.d/disable-algif.conf

验证:

lsmod | grep algif

无输出即成功。


方案2:SELinux 强制模式

检查:

getenforce

启用:

setenforce 1

配置永久:

vim /etc/selinux/config

修改:

SELINUX=enforcing

方案3:限制普通用户登录

关闭:

  • SSH 普通账号
  • CI Runner
  • 容器共享节点
  • JumpServer 非必要账号

方案4:Kubernetes 环境限制

增加:

securityContext:  privileged: false  allowPrivilegeEscalation: false

启用:

  • seccomp
  • AppArmor
  • SELinux

七、企业级应急处置流程

第一阶段:立即执行

1. 统计内核版本

ansible all -m shell -a "uname -r"

2. 检查漏洞模块

ansible all -m shell -a "lsmod | grep algif"

3. 禁止低权限登录

重点:

  • VPN
  • 堡垒机
  • CI/CD
  • Jenkins
  • GitLab Runner

4. 开启审计日志

auditctl  -a always,exit -F arch=b64 -S splice

八、企业级巡检脚本(生产版)

#!/bin/bashecho"===== CVE-2026-31431 检查 ====="echo"[1] 内核版本"uname -rechoecho "[2] algif模块"lsmod | grep algifechoecho "[3] AF_ALG支持"grep CONFIG_CRYPTO_USER_API /boot/config-$(uname -r)echoecho"[4] SELinux状态"getenforceechoecho "[5] 最近异常提权"grep "session opened for user root" /var/log/secure | tailechoecho"[6] 是否存在漏洞修复"rpm -q --changelog kernel | grep CVE-2026-31431echoecho "===== 检查完成 ====="

九、修复后验证

验证模块

lsmod | grep algif

应为空。


验证 SELinux

getenforce

输出:

Enforcing

验证内核

厂商修复版本应高于:

2026-04-30 后发布版本

十、企业级最佳实践

建议:

项目
建议
内核升级
必须
SELinux
强制开启
容器隔离
必须
普通用户限制
建议
内核热补丁
推荐
auditd审计
推荐
漏洞扫描
推荐
EDR/HIDS
推荐

十一、重点风险环境

重点排查:

  • Kubernetes
  • Docker 宿主机
  • GitLab Runner
  • Jenkins Agent
  • 云主机
  • 多租户服务器
  • 高权限堡垒机
  • HPC 集群

因为该漏洞支持:

容器逃逸

十二、官方参考资料

  • Ubuntu Security Notice
  • Red Hat Security Bulletin
  • Microsoft Security Blog
  • CISA KEV Catalog

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  1. CONNECT:[ UseTime:0.000602s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000672s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002644s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000288s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000550s ]
  6. SELECT * FROM `set` [ RunTime:0.000207s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000577s ]
  8. SELECT * FROM `article` WHERE `id` = 491995 LIMIT 1 [ RunTime:0.000479s ]
  9. UPDATE `article` SET `lasttime` = 1783108095 WHERE `id` = 491995 [ RunTime:0.016751s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000437s ]
  11. SELECT * FROM `article` WHERE `id` < 491995 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000599s ]
  12. SELECT * FROM `article` WHERE `id` > 491995 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005691s ]
  13. SELECT * FROM `article` WHERE `id` < 491995 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001807s ]
  14. SELECT * FROM `article` WHERE `id` < 491995 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001256s ]
  15. SELECT * FROM `article` WHERE `id` < 491995 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005264s ]
0.106004s