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最新Linux的本地提权漏洞分析

  • 2026-06-30 01:38:31
最新Linux的本地提权漏洞分析

2026年6月25日,JFrog Security Research公开了DirtyClone(CVE-2026-43503)。它不是一个全新的内核原语,而是DirtyFrag修复链上的回归绕过:__pskb_copy_fclone()在克隆skb时丢掉了SKBFL_SHARED_FRAG,于是esp_input()把一张仍然挂着文件页缓存的页误判成普通网络缓冲区,最后在原地解密时把数据写回了页缓存。

从NVD的变更记录看,这也不是单点失误,而是一组frag-transfer helper在转移frag描述符时都可能把共享标记弄丢;DirtyClone公开利用的是其中最直接的__pskb_copy_fclone()克隆路径。

文件页缓存
  -> TEE/dup to local克隆
  -> `__pskb_copy_fclone()`
  -> `SKBFL_SHARED_FRAG`丢失
  -> `esp_input()`
  -> 原地decrypt
  -> 页缓存被改写

1 漏洞成因

DirtyFrag原本已经补过一次:只要skb带着外部共享页,esp_input()就应该先走skb_cow_data(),再做解密。DirtyClone的问题在于,__pskb_copy_fclone()先复制frag描述符,再把剩余的shinfo交给skb_copy_header(),但后者只处理gso相关字段,不会把skb_shinfo()->flags里的SKBFL_SHARED_FRAG带过去。结果是,页还在,标记没了,skb_has_shared_frag()就会返回false。

再往下看,问题就变成了典型的“看起来不共享,实际上还共享”。esp_input()依据错误的标记跳过COW,后续的IPsec原地解密直接落在页缓存页上。磁盘文件本身没有被改,改动只停在内存里的page cache里,所以文件完整性监控和重启后的磁盘校验都看不见这个状态。

2 利用链

DirtyClone的PoC没有重新发明写原语,而是把DirtyFrag里已经验证过的seq_hi控字节技巧接了回来。大致流程是:

只读打开`/usr/bin/su`
  -> 把目标页塞进ESP包
  -> 用`TEE`或等价的`nft dup to local`在内核里复制该包
  -> 复制后的`skb`丢标记
  -> `esp_input()`原地写回
  -> 反复48次,覆盖`su`前192字节
  -> 执行被污染的`su`得到root

这里真正可控的是每个4字节word。PoC通过XFRM状态里的seq_hi携带目标word,再配合AES-CBC的IV和封装方式,让解密结果写成想要的字节。目标文件通常选/usr/bin/su,因为只要把它的前192字节换成一个极小的setuid(0)+execve("/bin/sh")ELF,下一次执行时就能拿到root。

PoC里用的是TEE,本质上只要能走到nf_dup_ipv4()并触发__pskb_copy_fclone(),思路就成立。

3 Ubuntu24.04上的现实约束

Ubuntu24.04和更高版本默认启用了AppArmor对非特权user namespace的限制。也就是说,标准的unshare(CLONE_NEWUSER|CLONE_NEWNET)起手式不再像Debian、Fedora那样顺手,PoC想拿到CAP_NET_ADMIN会被默认策略卡住。JFrog公开的代码也明确提到,在Ubuntu上需要放开kernel.apparmor_restrict_unprivileged_userns,或者让目标进程落在允许userns的AppArmor配置里。

所以,Ubuntu24.04不是“没有这个洞”,而是默认把最常见的利用起点收紧了。对普通本地用户来说,它更像是把标准打法从“开箱即用”变成了“还得先过一层系统策略”。

4 补丁与缓解

主线修复在2026年5月21日合入,首个修复标签是v7.1-rc5。真正稳妥的处理只有升级内核,并确认发行版回补链路完整。临时缓解只能缩小面:保留Ubuntu的userns限制,尽量别让普通用户获得CAP_NET_ADMIN,同时避免xt_TEEesp4esp6这类触发面自动加载。

参考资料

  • JFrog Security Research:https://research.jfrog.com/post/dissecting-and-exploiting-linux-lpe-variant-dirtyclone-cve-2026-43503/
  • DirtyClone PoC仓库:https://github.com/rafaeldtinoco/security/tree/main/exploits/dirtyclone
  • TheHackerNews报道:https://thehackernews.com/2026/06/new-dirtyclone-linux-kernel-flaw-lets.html
  • Ubuntu24.04发行说明:https://documentation.ubuntu.com/release-notes/24.04/
  • Ubuntu AppArmor user namespace说明:https://discourse.ubuntu.com/t/understanding-apparmor-user-namespace-restriction/58007
  • NVD变更记录:https://nvd.nist.gov/vuln/detail/CVE-2026-43503/change-record?changeRecordedOn=05%2F23%2F2026T10%3A16%3A43.350-0400

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  1. CONNECT:[ UseTime:0.000914s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000819s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.031911s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003167s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000669s ]
  6. SELECT * FROM `set` [ RunTime:0.000352s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000600s ]
  8. SELECT * FROM `article` WHERE `id` = 502086 LIMIT 1 [ RunTime:0.000674s ]
  9. UPDATE `article` SET `lasttime` = 1783006267 WHERE `id` = 502086 [ RunTime:0.009734s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000822s ]
  11. SELECT * FROM `article` WHERE `id` < 502086 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000557s ]
  12. SELECT * FROM `article` WHERE `id` > 502086 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000887s ]
  13. SELECT * FROM `article` WHERE `id` < 502086 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007636s ]
  14. SELECT * FROM `article` WHERE `id` < 502086 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.066434s ]
  15. SELECT * FROM `article` WHERE `id` < 502086 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.062337s ]
0.287697s