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关于Linux内核crypto子系统本地内存损坏漏洞(CVE-2026-31431)的安全告知

  • 2026-06-30 11:43:01
关于Linux内核crypto子系统本地内存损坏漏洞(CVE-2026-31431)的安全告知

漏洞详情

CVE-2026-31431(又称CopyFail)是Linux内核crypto加密子系统存在的本地高危漏洞,由algif_aead模块与authencesn加密模板共同引发,攻击者可借助AF_ALG套接字与splice()调用,实现对系统页缓存的可控4字节写入。

漏洞源于2017年Linux内核对algif_aead加入了in-place原地加密优化,会把splice()传入的文件页缓存通过sg_chain()链接到可写的输出散射表中。而authencesn在解密流程中,会越界使用目标缓冲区作为临时存储,在assoclen+cryptlen位置执行4字节写入,这段写入会直接命中页缓存,且内核不会标记脏页、不触发磁盘回写,形成无磁盘痕迹的内存篡改。

本地低权限用户就能利用该漏洞,只需要一段732字节的Python脚本即可稳定触发,不需要竞争条件,也不用针对不同发行版或内核版本做适配。攻击者通过篡改su、sudo等setuid程序的内存页缓存,运行后直接获取root权限,整个利用过程稳定、不触发系统崩溃,也不会在磁盘留下修改痕迹。

成功利用漏洞可直接实现本地提权到root,还能完成容器逃逸控制宿主机。因为攻击只修改内存页缓存,不改动磁盘文件,可绕过常规文件校验、HIDS/EDR等安全检测。同时可导致内核崩溃、业务中断,配合远程命令执行类漏洞可形成完整入侵链路,被广泛用于挖矿、勒索软件与内网横向渗透。

影响范围

漏洞从2017年相关代码提交后开始存在,Linux4.14及以上所有未打补丁的内核版本均受影响,覆盖Ubuntu24.04、AmazonLinux2023、RHEL14.3、SUSE16等主流发行版。

漏洞复现

排查方法

内核版本自查排查:

在服务器终端执行uname-r命令,查看当前Linux内核版本,只要是4.14及以上且未升级到官方修复基线版本,即可判定存在CVE-2026-31431漏洞风险,重点核查线上业务服务器、容器节点、云主机等资产。

内核模块加载状态排查:

检查系统是否加载漏洞关联的algif_aead内核模块,执行lsmodgrepalgif_aead,若查询到模块正常加载,说明系统具备漏洞触发前置条件,风险等级进一步升高。

容器环境资产排查:

梳理内网Docker、Kubernetes所有容器节点及业务容器,核查宿主机内核版本,同时排查是否存在普通低权限容器账户,一旦容器可正常调用AF_ALG套接字接口,就存在容器逃逸攻陷宿主机的风险。

异常行为日志排查:

查看系统安全日志、登录日志,重点监控普通低权限用户异常提权、短时间内频繁创建AF_ALG套接字、未知Python脚本异常运行等行为,排查是否已有攻击者利用漏洞尝试提权或植入后门。

系统加固配置排查:

检查服务器是否做过相关安全加固,包括是否限制AF_ALG套接字访问、是否通过seccomp规则封禁相关系统调用、是否禁用无用加密内核模块,未做任何加固配置的服务器均需纳入高危整改清单。

修复建议

1.优先升级内核至官方修复版本主线内核已在6.18.22+、6.19.12+、7.0+中合入补丁。各发行版需跟进对应稳定分支更新,例如Ubuntu、RHEL、SUSE等,只要内核版本低于上述基线且未打补丁,均需升级。

2.临时禁用漏洞模块若暂时无法升级,可直接禁止加载algif_aead

3.通过seccomp限制AF_ALG套接字对容器/普通用户环境,用seccomp规则屏蔽AF_ALG相关系统调用,阻止创建加密套接字,避免漏洞被利用。Docker/K8s可在容器运行时直接追加seccomp策略。

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参考链接

https://xint.io/blog/copy-fail-linux-distributions

https://seclists.org/oss-sec/2026/q2/281

https://gist.github.com/grenkoca/b82281a4706e936072979acf54b608df

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a664bf3d603d

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  1. CONNECT:[ UseTime:0.000896s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001433s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000561s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006029s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001317s ]
  6. SELECT * FROM `set` [ RunTime:0.018114s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000991s ]
  8. SELECT * FROM `article` WHERE `id` = 490572 LIMIT 1 [ RunTime:0.009247s ]
  9. UPDATE `article` SET `lasttime` = 1783086328 WHERE `id` = 490572 [ RunTime:0.018864s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.002216s ]
  11. SELECT * FROM `article` WHERE `id` < 490572 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.012870s ]
  12. SELECT * FROM `article` WHERE `id` > 490572 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000882s ]
  13. SELECT * FROM `article` WHERE `id` < 490572 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006408s ]
  14. SELECT * FROM `article` WHERE `id` < 490572 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.028119s ]
  15. SELECT * FROM `article` WHERE `id` < 490572 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003744s ]
0.281753s