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紧急预警:Linux内核高危提权漏洞“Fragnesia”曝光,本地攻击者可直接获取root权限

  • 2026-07-02 16:41:04
紧急预警:Linux内核高危提权漏洞“Fragnesia”曝光,本地攻击者可直接获取root权限

Linux内核被曝出一处可被本地攻击者利用的高危提权漏洞——Fragnesia(编号CVE-2026-46300)。该漏洞CVSS评分为7.8,影响范围覆盖绝大多数主流Linux发行版,政企服务器环境面临真实风险。

漏洞核心:低权限用户即可破坏只读文件,夺取系统控制权

该漏洞位于Linux内核的XFRM ESP-in-TCP子系统,由V12安全团队的William Bowling发现,安全公司Wiz发布了详细技术分析。

核心问题在于:非特权的本地攻击者可以修改内核页面缓存中的只读文件内容,例如/usr/bin/su 等关键系统二进制文件。一旦攻击者成功破坏页面缓存,就能实现确定性提权,完全控制易受攻击的系统。

与传统提权漏洞不同,Fragnesia无需复杂的竞态条件或时序攻击,可靠性较高,攻击者更容易在真实环境中复现。

漏洞原理简述:ESP/XFRM网络子系统的逻辑缺陷

研究人员解释,Fragnesia利用了Linux XFRM ESP-in-TCP实现中的逻辑缺陷,具体涉及网络数据包(skb)合并过程中对共享页面片段的不当处理。

攻击者可构造一种特殊场景:先将文件支持的页面“拼接”进TCP接收队列,随后系统切换到ESP加密处理模式。内核在对队列数据原地解密时,会通过AES-GCM密钥流操作,对底层页面缓存造成受控的、确定性的损坏,从而实现任意写入。

影响范围:几乎所有主流发行版

已发布安全公告和更新的厂商包括:

  • Debian

  • Ubuntu

  • Red Hat

  • SUSE

  • Amazon Linux

  • AlmaLinux

  • Gentoo

此外,概念验证(PoC)利用代码已公开发布,意味着攻击者研究并纳入攻击工具链的门槛大幅降低,政企单位应尽快采取行动。

与已知漏洞“Dirty Frag”异同

Fragnesia与早期Linux提权漏洞Dirty Frag影响同一攻击面,但存在重要区别:

  • 不需要宿主机级权限即可利用

  • AppArmor等限制只能提供部分缓解,无法完全防御

紧急处置建议

对于无法立即升级内核的单位,安全专家建议采取以下措施:

1.优先应用官方补丁

检查各Linux发行版官方安全公告,尽快通过包管理器更新内核至修复版本。

2.临时缓解措施(无法立即打补丁时)

  • 禁用不必要的XFRM/IPsec功能

  • 严格控制本地shell访问权限,仅允许必要人员登录

  • 加固容器环境,避免容器内提权影响到宿主机

  • 加强对可疑提权行为的监控与告警

3.关注补丁节奏

对于部分发行版的旧版本,若官方已停止维护,建议尽快升级操作系统版本。

当前威胁态势

截至目前,尚无证据表明该漏洞已被用于真实世界的攻击。但由于PoC已公开,且漏洞利用无需复杂条件,安全社区普遍认为攻击者可能很快跟进。建议各单位在下一轮安全补丁窗口期中,优先安排本次内核漏洞的修复工作。

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  1. CONNECT:[ UseTime:0.000549s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000647s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007527s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002396s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000678s ]
  6. SELECT * FROM `set` [ RunTime:0.006206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000749s ]
  8. SELECT * FROM `article` WHERE `id` = 494774 LIMIT 1 [ RunTime:0.048052s ]
  9. UPDATE `article` SET `lasttime` = 1783032161 WHERE `id` = 494774 [ RunTime:0.026204s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.019107s ]
  11. SELECT * FROM `article` WHERE `id` < 494774 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.063949s ]
  12. SELECT * FROM `article` WHERE `id` > 494774 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015049s ]
  13. SELECT * FROM `article` WHERE `id` < 494774 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.075471s ]
  14. SELECT * FROM `article` WHERE `id` < 494774 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.060064s ]
  15. SELECT * FROM `article` WHERE `id` < 494774 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.031039s ]
0.430342s