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安全事件:Linux史诗级提权漏洞之Dirty Frag(附POC)

  • 2026-07-03 05:32:35
安全事件:Linux史诗级提权漏洞之Dirty Frag(附POC)

危害等级:高 | 利用成熟度:EXP 已公开

参考来源:https://mp.weixin.qq.com/s/G4rBigxp-6DmYNP4mPVotA

概述

2026 年 5 月 7 日,Linux 内核本地提权漏洞 Dirty Frag 被公开披露。该漏洞通过链式利用两个独立的页缓存写入原语——xfrm-ESP Page-Cache Write(2017 年引入)与 RxRPC Page-Cache Write(2023 年引入)——使本地普通用户可无条件提权至 root。

Dirty Frag 与 Dirty Pipe、Copy Fail 同属页缓存污染漏洞家族,但危害更甚:即使已部署 Copy Fail 官方补丁或缓解措施,系统仍受 Dirty Frag 影响。

该漏洞为确定性逻辑漏洞,不依赖时间竞争窗口、无需竞态条件;利用失败时不会触发内核崩溃,整体利用成功率极高。

截至 2026-05-08,正式的官方补丁和 CVE 编号均未发布

漏洞成因

两个变体均利用了 Linux 内核在零拷贝发送路径中,通过 splice() 将攻击者只有读权限的页缓存页植入 skb 的 frag 槽后,接收侧内核代码对该 frag 执行就地(in-place)加密操作,从而造成对攻击者本无写权限的页缓存文件的任意修改。

两个变体链式执行:ESP 变体优先尝试(覆盖 RHEL、CentOS 等大多数发行版),若 unshare 被 AppArmor 阻断则自动回退 RxRPC 变体(Ubuntu 默认内置 rxrpc.ko),实现对主流发行版的无缝覆盖。

漏洞影响

场景

影响描述

本地提权

任意本地普通用户账户可无条件提权为 root

容器逃逸

Kubernetes / 容器环境中,页缓存为宿主机共享,容器内攻击者可突破容器边界,危及宿主节点及同节点其他租户

CI/CD 沦陷

GitHub Actions、GitLab Runner、Jenkins Agent 等执行不可信代码的 CI 环境,攻击者可通过恶意 PR 直接获取 Runner 宿主机的 root 权限

云多租户

Notebook、Serverless、Agent 沙箱等执行用户代码的云服务,租户可提权为宿主机 root

漏洞持续近 9 年(问题代码于 2017 年引入)。

受影响版本

漏洞变体

引入 commit

引入时间

受影响范围

xfrm-ESP Page-Cache Write

cac2661c53f3

2017 年 1 月

2017-01 至今所有内核版本

RxRPC Page-Cache Write

2dc334f1a63a

2023 年 6 月

2023-06 至今所有内核版本

已验证受影响的发行版:

发行版

受影响内核版本

Ubuntu 24.04.4

6.17.0-23-generic 及以下

RHEL 10.1

6.12.0-124.49.1.el10_1.x86_64 及以下

CentOS Stream 10

6.12.0-224.el10.x86_64 及以下

AlmaLinux 10

6.12.0-124.52.3.el10_1.x86_64 及以下

openSUSE Tumbleweed

7.0.2-1-default 及以下

Fedora 44

6.19.14-300.fc44.x86_64 及以下

Debian / Arch / Rocky / Oracle

同期内核版本均受影响

POC 地址

https://github.com/V4bel/dirtyfrag

git clone https://github.com/V4bel/dirtyfrag.git && cd dirtyfrag && gcc -O0 -Wall -o exp exp.c -lutil && ./exp

临时解决方案

禁用三个相关内核模块可同时阻断两个变体的利用路径:

sh -"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"

禁用影响评估:

  • 不影响:普通 TCP/UDP 应用、TLS、SSH、HTTP(S) 服务、dm-crypt/LUKS 磁盘加密、kTLS

  • 可能影响:IPsec/ESP 隧道(VPN)、Andrew File System(AFS)相关服务

执行前确认:lsmod | grep -E 'esp4|esp6|rxrpc'

升级修复(待发行版推送后执行)

xfrm-ESP 变体补丁已于 2026-05-07 合入 netdev 树(commit f4c50a4034e62ab75f1d5cdd191dd5f9c77fdff4),RxRPC 变体补丁已提交上游审查(net/rxrpc/call_event.c + conn_event.c),各主流发行版正在陆续回溯。

# Ubuntu / Debianapt update && apt upgrade linux-image-$(uname -r)# RHEL / CentOS / Rocky / AlmaLinuxdnf update kernel# openSUSE / SUSEzypper update kernel-default# Fedoradnf update kernel

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  1. CONNECT:[ UseTime:0.000462s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000844s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000276s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.017041s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000737s ]
  6. SELECT * FROM `set` [ RunTime:0.000237s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000687s ]
  8. SELECT * FROM `article` WHERE `id` = 492341 LIMIT 1 [ RunTime:0.002295s ]
  9. UPDATE `article` SET `lasttime` = 1783053164 WHERE `id` = 492341 [ RunTime:0.013766s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.003823s ]
  11. SELECT * FROM `article` WHERE `id` < 492341 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.032687s ]
  12. SELECT * FROM `article` WHERE `id` > 492341 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.034144s ]
  13. SELECT * FROM `article` WHERE `id` < 492341 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.043422s ]
  14. SELECT * FROM `article` WHERE `id` < 492341 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009302s ]
  15. SELECT * FROM `article` WHERE `id` < 492341 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008469s ]
0.240584s