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Linux提权漏洞:普通用户1k脚本拿下Root权限!运维人五一怎么办?(几乎所有2017年以来的主流内核都受影响)

  • 2026-06-29 07:46:36
Linux提权漏洞:普通用户1k脚本拿下Root权限!运维人五一怎么办?(几乎所有2017年以来的主流内核都受影响)
今天是2026年4月30日,五一小长假前的最后一个工作日。

本来大家已经收拾好行李,准备好高铁、飞机票回家、出去浪,结果Linux内核又炸了!

一个叫CVE-2026-31431(官方昵称CopyFail)的本地提权漏洞,正式公开披露。

它能让任意普通用户(甚至容器里的普通进程),用一个732字节的Python脚本,直接把/usr/bin/su改成自己的后门,秒变root用户!

更狠的是:几乎所有主流Linux发行版,从2017年到现在,全中招!

最扎心的是,距离五一假期,只剩下最后几个小时了。

这个漏洞到底有多简单、多狠?“降维打击”!

1

降维打击

如果说一般的漏洞是“撬锁”,那么这次的CVE-2026-31431简直就是“降维打击”。

根据公开的POC显示,攻击者只需要通过普通用户权限执行一段仅有732字节的Python脚本,就能瞬间获取最高的root权限。

而且还可以完美实现容器逃逸(从K8s容器里直接跳到宿主机)。

2

技术细节(白话版)

Linux内核的crypto/algif_aead模块(AF_ALG接口)在2017年加了个“in-place优化”(commit 72548b09)。

这个优化本来是好心,结果在处理AEAD解密 + splice()的时候,把文件页面缓存的“标签页”错误地链到了可写缓冲区。

攻击者用splice()把/usr/bin/su的页面“喂”进去,再触发一次失败的解密,内核就会往su的页面缓存里强行写4字节(攻击者可控)。

重复几次,就能把su改成一个直接exec /bin/sh的shellcode。

整个过程不需要任何权限,不需要有效tag,不需要root,不需要重启,一键root!

影响多大?主流发行版几乎“全军覆没”

1

内核版本

内核版本:

    4.14及以后(2017年后发布的所有内核),直到打上补丁前的全中。

已修复版本(上游):

    6.18.22+

    6.19.12+

    7.0及以后

2

主流发行版(基本全覆盖)

经过安全界快速测试,截至目前发现:

    RHEL / CentOS / AlmaLinux / Rocky

    Ubuntu(包括 LTS 版本)

    Debian

    SUSE / openSUSE

    Amazon Linux / Oracle Linux / Fedora / Arch……

多数基于 Linux 内核的虚拟化/容器平台

也就是说:

几乎所有主流 Linux 发行版,只要用了受影响内核版本(包括很老的 5.x / 4.x 内核),就都可能被利用。

怎么办?三步走,别让五一变“修一”

1

立刻自查(30秒搞定)

uname -r

lsmod | grep -E 'algif_aead|af_alg'

如果看到algif_aead已加载 + 内核版本在4.14~6.18.21之间 → 危险!

临时紧急缓解(强烈推荐,现在就执行)

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

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

sudo update-initramfs -u   # Ubuntu/Debian系

sudo dracut -f                 # RHEL/CentOS系

sudo reboot

禁用后,漏洞失效,对业务影响需自行判断(还好algif_aead不算是日常必备模块)

3

长期方案

apt update && apt full-upgrade 或 

yum update kernel 

升级到带修复的内核

官方修复补丁已有,Linux内核提交了修复补丁,撤销了有问题的in-place操作逻辑,并推荐用户尽快升级内核。

官方参考资料

https://www.cve.org/CVERecord?id=CVE-2026-31431

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

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

最后,祝大家五一都能平平安安,服务器永不宕机,系统永无漏洞!

点击关注,后台联系我,获取最新相关资源信息!

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  1. CONNECT:[ UseTime:0.000600s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000958s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.025941s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.010024s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000898s ]
  6. SELECT * FROM `set` [ RunTime:0.039959s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000953s ]
  8. SELECT * FROM `article` WHERE `id` = 490524 LIMIT 1 [ RunTime:0.009859s ]
  9. UPDATE `article` SET `lasttime` = 1783095230 WHERE `id` = 490524 [ RunTime:0.010394s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.005633s ]
  11. SELECT * FROM `article` WHERE `id` < 490524 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002311s ]
  12. SELECT * FROM `article` WHERE `id` > 490524 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011852s ]
  13. SELECT * FROM `article` WHERE `id` < 490524 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.180287s ]
  14. SELECT * FROM `article` WHERE `id` < 490524 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.107200s ]
  15. SELECT * FROM `article` WHERE `id` < 490524 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.018438s ]
0.528198s