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Linux内核存在本地权限提升漏洞

  • 2026-07-01 22:37:45
Linux内核存在本地权限提升漏洞
漏洞概述
漏洞编号:CNTA-2026-0002(CNVD-2026-19044,对应CVE-2026-31431)
发布日期:2026年4月30日
漏洞类型:Linux内核本地权限提升漏洞
危险等级:高危
漏洞详情
Linux内核加密子系统存在逻辑处理缺陷,本地普通权限用户可通过组合AF_ALG套接字和splice系统调用,向可读文件或SUID程序的页缓存中写入4字节数据,从而篡改setuid等高权限进程,最终获得root权限。
影响范围
受影响系统
默认启用或可加载 algif_aead 模块的Linux发行版:
Ubuntu 24.04 LTS及以下
Amazon Linux 2023及以下
RedHat Enterprise Linux 10/9/8及以下
SUSE 16及以下
Debian、Arch、Fedora、Rocky、Alma、Oracle等同期内核版本
内核版本范围
受影响提交: commit 72548b093ee3 ≤ version < commit a664bf3d603d 
未受影响版本:内核主线7.0+、稳定版6.18.22+、稳定版6.19.12+
高危场景
共享服务器(多租户主机、开发机、跳板机)
Kubernetes和容器集群
CI/CD执行器(GitHub Actions、GitLab Runner、Jenkins等)
处置建议
根本解决方案
立即升级至官方修复版本:https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5 
临时缓解措施
禁用algif_aead内核模块
通过seccomp或运行安全策略,阻断容器内AF_ALG socket创建
重要提醒
漏洞利用代码已公开
安天公司报告已发现漏洞在野利用情况
特别建议云服务器、容器宿主机、多租户环境用户立即采取行动
该漏洞对云计算和容器化环境威胁较大,建议相关管理员优先处理。

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  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=4f5fe8c0cec13b917c6fd937929ab2a0
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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000393s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000546s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.036488s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000305s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000582s ]
  6. SELECT * FROM `set` [ RunTime:0.000280s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000768s ]
  8. SELECT * FROM `article` WHERE `id` = 490790 LIMIT 1 [ RunTime:0.002396s ]
  9. UPDATE `article` SET `lasttime` = 1783053079 WHERE `id` = 490790 [ RunTime:0.033704s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.007322s ]
  11. SELECT * FROM `article` WHERE `id` < 490790 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.012447s ]
  12. SELECT * FROM `article` WHERE `id` > 490790 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006412s ]
  13. SELECT * FROM `article` WHERE `id` < 490790 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013642s ]
  14. SELECT * FROM `article` WHERE `id` < 490790 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.031632s ]
  15. SELECT * FROM `article` WHERE `id` < 490790 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008998s ]
0.252659s