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【已复现】Linux Kernel CIFSwitch 本地权限提升漏洞(QVD-2026-29453)安全风险通告

  • 2026-07-01 16:20:37
【已复现】Linux Kernel CIFSwitch 本地权限提升漏洞(QVD-2026-29453)安全风险通告

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漏洞概述

漏洞名称

Linux Kernel CIFSwitch 本地权限提升漏洞

漏洞编号

QVD-2026-29453

公开时间

2026-05-27

影响量级

百万级

奇安信评级

高危

CVSS 3.1分数

7.8

威胁类型

权限提升

利用可能性

POC状态

已公开

在野利用状态

未发现

EXP状态

已公开

技术细节状态

已公开

危害描述:本地低权限用户可构造伪造 cifs.spnego 密钥描述发起 request_key 调用,触发 root 权限 cifs.upcall,通过命名空间切换与 NSS 模块加载实现 root 代码执行,获取系统最高权限。

01
漏洞详情
>>>>

影响组件

Linux 内核是开源操作系统内核,提供进程管理、内存管理、文件系统、网络协议栈等核心能力,支持 x86_64、ARM 等多架构,是 Ubuntu、CentOS、Debian、Fedora 等主流发行版的基础。CIFS/SMB 是 Windows 与类 Unix 系统通用的网络文件共享协议,Linux 内核通过 CIFS 客户端实现 SMB 共享挂载、读写与 Kerberos 认证。cifs-utils 是配套用户空间工具,提供 cifs.upcall 等辅助程序,处理内核 CIFS 子系统的 Kerberos/SPNEGO 认证请求,通过内核密钥环完成凭证交互,广泛用于企业文件服务、跨平台存储访问场景。

>>>>

漏洞描述

近日,奇安信CERT监测到官方修复Linux Kernel CIFSwitch 本地权限提升漏洞(QVD-2026-29453),该漏洞源于内核未对 cifs.spnego 类型密钥的描述信息做来源合法性校验,未实现 vet_description 钩子验证密钥是否由内核 CIFS 生成;cifs.upcall 以 root 权限运行时无条件信任密钥描述中的 pid、uid、creduid、upcall_target 等攻击者可控字段。本地低权限用户可构造伪造 cifs.spnego 密钥描述发起 request_key 调用,触发 root 权限 cifs.upcall,通过命名空间切换与 NSS 模块加载实现 root 代码执行,获取系统最高权限。目前该漏洞PoC和技术细节已公开。鉴于该漏洞影响范围较大,建议客户尽快做好自查及防护。
>>>>

利用条件

1.系统安装 cifs-utils 并保留默认 cifs.spnego request-key 规则;

2.Linux 内核 CIFS 模块可加载或内置;

3.启用非特权用户命名空间与挂载命名空间;

4.未被 AppArmor/SELinux 默认策略阻断 (部分发行版默认阻断)。

02
影响范围
>>>>

影响版本

Linux Kernel commit < 3da1fdf4efbc490041eb4f836bf596201203f8f2,自 2007 年起所有支持 CIFS 的未打补丁版本
cifs-utils >= 6.14(含部分旧版回溯修复引入问题版本)
目前已知受影响版本:
Linux Mint 21.3 / 22.3(Cinnamon)
CentOS Stream 9(GNOME)
Rocky Linux 9(Workstation)
Kali Linux 2021.4 / 2022.4 / 2023.4 / 2024.4 / 2025.4 / 2026.1(headless)
AlmaLinux 9.7(Workstation / Azure cloud image)
SUSE Linux Enterprise Server 15 SP7、SLES SAP 15 SP7、SLES SAP 16
03
复现情况

目前,奇安信威胁情报中心安全研究员已成功复现Linux Kernel CIFSwitch 本地权限提升漏洞(QVD-2026-29453),截图如下:

04
处置建议
>>>>

安全更新

目前官方已有可更新版本,建议用户尽快将内核升级至已包含此补丁的版本:
Linux Kernel commit >= 3da1fdf4efbc490041eb4f836bf596201203f8f2
下载地址:
https://github.com/torvalds/linux/commit/3da1fdf4efbc490041eb4f836bf596201203f8f2
同时,及时更新 cifs-utils 软件包至修复版本。
临时缓解方案:
1.非必要场景卸载 cifs-utils 或禁用 / 屏蔽 CIFS 内核模块加载。
2.删除或覆盖默认的 cifs.spnego 规则(无需 Kerberos 认证的 CIFS 功能时)。例如,创建一个空规则来阻止 cifs.spnego 请求。
3.禁用非特权用户命名空间(sysctl 控制)。
05
参考资料

[1]https://seclists.org/oss-sec/2026/q2/717

[2]https://heyitsas.im/posts/cifswitch/

06
时间线

2026年05月29日,奇安信 CERT发布安全风险通告。

07
漏洞情报服务

奇安信ALPHA威胁分析平台已支持漏洞情报订阅服务:

奇安信 CERT
致力于第一时间为企业级用户提供权威漏洞情报和有效解决方案。

点击↓阅读原文,到ALPHA威胁分析平台订阅更多漏洞信息。

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  1. CONNECT:[ UseTime:0.000409s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000880s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000566s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000223s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000459s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000535s ]
  8. SELECT * FROM `article` WHERE `id` = 496120 LIMIT 1 [ RunTime:0.008129s ]
  9. UPDATE `article` SET `lasttime` = 1783016368 WHERE `id` = 496120 [ RunTime:0.007959s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000297s ]
  11. SELECT * FROM `article` WHERE `id` < 496120 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000532s ]
  12. SELECT * FROM `article` WHERE `id` > 496120 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000574s ]
  13. SELECT * FROM `article` WHERE `id` < 496120 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.017013s ]
  14. SELECT * FROM `article` WHERE `id` < 496120 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005971s ]
  15. SELECT * FROM `article` WHERE `id` < 496120 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001988s ]
0.113965s