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Anolis OS Linux Dirty Frag 漏洞安全声明

  • 2026-07-03 12:43:43
Anolis OS Linux Dirty Frag 漏洞安全声明

漏洞概述

Dirty Frag 是最近爆出的 Linux 内核本地提权漏洞。该漏洞通过组合两个变种(ESP 和 RxRPC),能够在主流 Linux 发行版上获取 root 权限。这是继 Dirty Pipe (CVE-2022-0847) 和 Copy Fail(CVE-2026-31431) 之后,同一漏洞模式(通过 zero-copy/splice 进行 page cache 污染)的延伸。

核心原理

在零拷贝发送路径上,splice() 将攻击者只读的文件 page cache 页面直接注入到 struct sk_buff 的 frag 成员中,接收端内核代码对该 frag 执行原地(in-place)加解密操作,可以操纵 setuid 类型的文件的 page cache 在内存中被修改。

与 Dirty Pipe / Copy Fail 的关系

Dirty Frag 与 Dirty Pipe、Copy Fail 属于同一漏洞类,但操作目标不同:

1.Dirty Pipe:覆写 struct pipe_buffer。

2.Copy Fail:通过 AF_ALG 的 areq->tsgl 进行 scatterlist 链式写入。

3.Dirty Frag:覆写 struct sk_buff 的 frag 成员。

三者的本质相同 —— 利用 splice 零拷贝机制将 page cache 页面注入内核网络路径,利用内核对该页面的原地写入操作实现 page cache 污染。

影响范围

注意:两个问题模块(ESP / RxRPC)是"或"的关系,任何一个模块都能被利用。

内核模块
引入时间/补丁
版本范围
上游修复状态
xfrm-ESP
(CVE-2026-43284)
[2017] 
cac2661c53f3
4.11 ~ 7.0
补丁合入 mainline 及 stable-6.6.138
RxRPC
(CVE-2026-43500)
[2023] 
2dc334f1a63a
6.5 ~ 7.0
补丁已提交社区review中,尚未被接受

说明:Anolis OS 内核默认只以 module 形式内置了 XFRM-ESP 模块,未内置 RXRPC 模块,因此只有 esp4/esp6 受影响。

产品
内核
受影响状态
备注
Anolis OS 7
ANCK 4.19
受影响
PoC 已验证,缓解方案 #1 验证有效
Anolis OS 8
ANCK 5.10
受影响
PoC 已验证,缓解方案 #1 验证有效
Anolis OS 23
ANCK 6.6
受影响
PoC 已验证,缓解方案 #1 验证有效

建议:受影响用户请立即采用下方的缓解方案降低风险,社区将持续跟进上游修复进展。

缓解方案

方案 #1:禁用漏洞模块(推荐)

卸载并禁止加载有漏洞的内核模块 esp4、esp6、rxrpc!立即生效,无需重启!副作用:会中断 IPsec(VPN)和 RxRPC(AFS 文件系统),请根据实际业务评估。

1.检查系统是否内置有漏洞的内核模块:

zgrep -i "RXRPC\|XFRM_ESP" /proc/config.gz

Anolis OS 4 输出示例(表示只内置了 esp 模块,rxrpc 模块未支持,不受影响)

CONFIG_XFRM_ESP=m# CONFIG_AF_RXRPC is not set
2.禁止模块加载并卸载已加载模块,执行以下命令即可:
sudo sh -c "printf 'install esp4 /bin/false\ninstall esp6 /bin/false\ninstall rxrpc /bin/false\n' > /etc/modprobe.d/dirtyfrag.conf"sudo rmmod esp4 esp6 rxrpc 2>/dev/null || true

该措施无需重启,仅禁用相关内核模块。

方案 #2:限制 user namespace(仅阻断 ESP 变种)

此方案只阻断 ESP 变种,RxRPC 变种不需要 user namespace。注意:可能影响容器运行时(Docker/Podman rootless 模式、Flatpak 等)。

# 临时关闭(立即生效)sysctl -w kernel.unprivileged_userns_clone=0# 永久生效echo "kernel.unprivileged_userns_clone = 0" >> /etc/sysctl.conf

修复方案

目前上游 Linux 社区修复进展如下:

  • xfrm-ESP 模块修复补丁已合入 mainline(链接见文末及回合至 stable-6.6.138(链接见文末

  • RxRPC 模块:修复补丁已提交社区 review 中(链接见文末),尚未被接收。

Anolis OS 社区将持续跟进上游修复进展,在补丁可用后第一时间评估并提供安全更新。建议用户在此前采用上述缓解方案降低风险。

事件时间线

日期
事件
2026-04-29
RxRPC 补丁提交到公开的 netdev 邮件列表
2026-04-30
ESP 补丁提交到公开的 netdev 邮件列表,漏洞信息已公之于众
2026-05-03
私有仓库 DirtyFrag-rxrpc-LPE 发布漏洞信息
2026-05-04
提交 shared-frag 方案补丁到公开 netdev
私有仓库 DirtyFrag-esp-LPE 发布漏洞信息
2026-05-07
ESP 补丁合入 netdev 主线
完整 exploit + 文档提交到 linux-distros(私下,5 天 embargo)
第三方公开发布 exploit
完整 Dirty Frag 文档被公开发布

参考资料(复制链接至浏览器打开)

cac2661c53f3 补丁链接:

https://github.com/torvalds/linux/commit/cac2661c53f3

2dc334f1a63a 补丁链接

https://github.com/torvalds/linux/commit/2dc334f1a63a

Dirty Frag PoC & Documentation:
https://github.com/V4bel/dirtyfrag/
Red Hat Security Vulnerability RHSB-2026-003:
https://access.redhat.com/security/vulnerabilities/RHSB-2026-003
Linux stable-6.6.138 ESP Fix Commit:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.6.y&id=50ed1e7873100f77abad20fd31c51029bc49cd03
mainline 链接:
https://github.com/torvalds/linux/commit/f4c50a4034e62
RxRPC Patch Submission:

https://lore.kernel.org/all/afKV2zGR6rrelPC7@v4bel/

—— 完 ——

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  1. CONNECT:[ UseTime:0.001183s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001775s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000774s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000671s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001582s ]
  6. SELECT * FROM `set` [ RunTime:0.000594s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001738s ]
  8. SELECT * FROM `article` WHERE `id` = 492494 LIMIT 1 [ RunTime:0.001397s ]
  9. UPDATE `article` SET `lasttime` = 1783091608 WHERE `id` = 492494 [ RunTime:0.016828s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000715s ]
  11. SELECT * FROM `article` WHERE `id` < 492494 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001649s ]
  12. SELECT * FROM `article` WHERE `id` > 492494 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001041s ]
  13. SELECT * FROM `article` WHERE `id` < 492494 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001719s ]
  14. SELECT * FROM `article` WHERE `id` < 492494 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002766s ]
  15. SELECT * FROM `article` WHERE `id` < 492494 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003039s ]
0.200505s