当前位置:首页>Linux>【风险提示】天融信关于Linux Kernel本地权限提升漏洞Dirty Frag的风险提示

【风险提示】天融信关于Linux Kernel本地权限提升漏洞Dirty Frag的风险提示

  • 2026-06-28 21:28:00
【风险提示】天融信关于Linux Kernel本地权限提升漏洞Dirty Frag的风险提示

0x00 背景介绍


近日,天融信阿尔法实验室监测到Linux Kernel主线修复了一个本地权限提升漏洞Dirty Frag。该漏洞已存在9年,影响几乎所有主流企业级和桌面Linux发行版。由于该漏洞是一个逻辑漏洞,因此漏洞利用成功率极高。当前,此漏洞的细节及Exp已经公开,暂未发现主流发行版发布针对该问题的补丁或更新,因此,请受影响用户立即根据修复建议对该漏洞进行防御。

0x01 漏洞描述

Linux内核是一个开源、宏内核但支持动态模块加载的操作系统核心,负责管理硬件资源并为上层软件提供运行环境。它通过进程调度、内存管理、虚拟文件系统、网络协议栈和设备驱动等关键子系统,实现对CPU、内存、磁盘及外设的抽象与调度,并提供稳定、安全和高效的接口供应用程序使用。凭借高可移植性、丰富的驱动支持和强大的社区协作,其已成为从嵌入式设备到超级计算机、从安卓系统到云服务器广泛采用的基础核心。

Dirty Frag是Linux Kernel网络子系统中的一种漏洞类别,其通过链接xfrm-ESP Page-Cache Write漏洞和RxRPC Page-Cache Write漏洞在大多数Linux发行版上获得root权限。Dirty Frag与Dirty Pipe和Copy Fail的形成原因具有高度的相似性,但具体细节不同。

这两个漏洞的共同之处在于,在零拷贝(zero-copy)发送路径中,当splice()函数将攻击者仅拥有读取权限的页面缓存页引用直接植入发送方skb的片段槽时,接收方内核代码会对该片段执行原地加密。结果,非特权用户仅拥有读取权限的文件(例如/etc/passwd或/usr/bin/su)的页面缓存会被修改,并且后续每次读取都会看到修改后的副本,从而实现提权。

请注意,无论algif_aead模块是否可用,Dirty Frag漏洞都可能被触发。换句话说,即使在应用了公开已知的Copy Fail缓解措施(algif_aead黑名单)的系统上,您的Linux系统仍然容易受到Dirty Frag漏洞的攻击。

漏洞复现(复现环境Ubuntu 22.04.4 LTS:

0x02 漏洞编号

暂无
0x03 漏洞等级

高危
0x04 受影响版本

几乎影响所有主流企业级和桌面Linux发行版。

xfrm-ESP Page-Cache Write漏洞影响范围:

Linux Kernel主线Commit >= cac2661c53f3(2017-01-17)

RxRPC Page-Cache Write漏洞影响范围:

Linux Kernel主线Commit >= 2dc334f1a63a(2023-06-08)

已知受影响的发行版:

Ubuntu 22.04.4 LTS(6.8.0-40-generic)

Ubuntu 24.04.4 LTS(6.17.0-23-generic)

RHEL 10.1(6.12.0-124.49.1.el10_1.x86_64)

openSUSE Tumbleweed(7.0.2-1-default)

CentOS Stream 10(6.12.0-224.el10.x86_64)

AlmaLinux 10(6.12.0-124.52.3.el10_1.x86_64)

Fedora 44(6.19.14-300.fc44.x86_64)

0x05 修复建议

Linux Kernel官方暂未发布正式补丁,可通过以下命令删除存在漏洞的内核模块,进行临时缓解。

sh -c "printf 'install esp4 /bin/false\ninstall esp6 /bin/false\ninstall rxrpc /bin/false\n' > /etc/modprobe.d/dirtyfrag.conf; rmmod esp4 esp6 rxrpc 2>/dev/null; true"

0x06 声明


天融信阿尔法实验室拥有对此公告的修改和解释权,如欲转载,必须保证此公告的完整性。由于传播、利用此公告而造成的任何后果,均由使用者本人负责,天融信阿尔法实验室不为此承担任何责任。

天融信阿尔法实验室成立于2011年,一直以来,阿尔法实验室秉承“攻防一体”的理念,汇聚众多专业技术研究人员,从事攻防技术研究,在安全领域前瞻性技术研究方向上不断前行。作为天融信的安全产品和服务支撑团队,阿尔法实验室精湛的专业技术水平、丰富的排异经验,为天融信产品的研发和升级、承担国家重大安全项目和客户服务提供强有力的技术支撑。

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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:0.000912s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000394s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000315s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000653s ]
  6. SELECT * FROM `set` [ RunTime:0.000298s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000716s ]
  8. SELECT * FROM `article` WHERE `id` = 492155 LIMIT 1 [ RunTime:0.001656s ]
  9. UPDATE `article` SET `lasttime` = 1783081937 WHERE `id` = 492155 [ RunTime:0.004635s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000322s ]
  11. SELECT * FROM `article` WHERE `id` < 492155 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000530s ]
  12. SELECT * FROM `article` WHERE `id` > 492155 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000488s ]
  13. SELECT * FROM `article` WHERE `id` < 492155 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000892s ]
  14. SELECT * FROM `article` WHERE `id` < 492155 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001327s ]
  15. SELECT * FROM `article` WHERE `id` < 492155 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002346s ]
0.121238s