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【漏洞通告】关于 Nginx、Linux Kernel 高危漏洞的风险防范提醒

  • 2026-07-02 16:42:06
【漏洞通告】关于 Nginx、Linux Kernel 高危漏洞的风险防范提醒

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近期,安全研究人员披露Nginx 缓冲区溢出漏洞(CVE-2026-42945)、Linux Kernel 权限提升漏洞(CVE-2026-46300)两例高危漏洞。

本次漏洞无法通过外网流量识别检测,仅可通过本地核查确认风险。为守护校园网络环境及师生设备、数据安全,网络中心紧急发布漏洞自查与防护整改指南,请各位师生立即对照排查处置!

漏洞一

Nginx ngx_http_rewrite_module缓冲区溢出漏洞CVE-2026-42945(高危)

PART 1

漏洞详情

在NGINX的ngx_http_rewrite_module模块中,一条rewrite指令后面紧接着另一条rewrite、if或set指令,且前一条rewrite规则使用了未命名的PCRE捕获组(例如$1、$2)同时其替换字符串中包含问号(?)时,处理逻辑存在缺陷。这导致未经认证的攻击者能够通过发送特制的HTTP请求,在NGINX工作进程中触发堆缓冲区溢出,进而引发进程重启,该漏洞还可能被进一步利用实现远程代码执行。

PART 2

受影响版本

1、0.6.27 ≤ Nginx Open Source < 1.30.1

2、R36 ≤ Nginx Plus < R36 P4、R32 ≤ Nginx Plus < R32 P6

PART 3

漏洞修复升级

官方已发布最新版本修复该漏洞,建议受影响用户将更新到最新版本。 

参考链接:https://my.f5.com/manage/s/article/K000161019

漏洞二

Linux Kernel Fragnesia 权限提升漏洞CVE-2026-46300(高危)

PART 1

漏洞详情

Linux Kernel Fragnesia 权限提升漏洞(CVE-2026-46300)是 Linux 内核 XFRM ESP-in-TCP / IPsec ESP 相关处理路径中的 Page Cache 写入类漏洞。由于 skb_try_coalesce() 在合并 socket buffer 分片时未正确保留共享分片标记,内核可能在后续 ESP 原地解密过程中错误地对 file-backed page cache 页面进行写入,导致本地低权限攻击者可篡改只读文件在内存页缓存中的内容,而无需修改磁盘文件。攻击者在具备本地执行条件后,可利用该问题影响如 /usr/bin/su 等高权限程序的缓存内容,从而实现本地权限提升并获取 root 权限。

PART 2

受影响版本

1、xfrm-ESP commit version > cac2661c53f3

2、RxRPC commit version > 2dc334f1a63a

PART 3

漏洞修复升级

1、官方补丁:更新Linux内核到Linux官方发布的修复CVE-2026-46300漏洞的对应版本,安装官方发布的安全补丁。

2、临时措施:禁用 Fragnesia 和 DirtyFrag 中存在漏洞的模块。

网络安全无小事,高危漏洞是网络攻击的高频突破口。全体师生需提高安全防范意识,规范设备与系统管理,及时完成漏洞修复,共同守护校园网络空间安全稳定。

END

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  1. CONNECT:[ UseTime:0.000900s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001377s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000610s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.018619s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001653s ]
  6. SELECT * FROM `set` [ RunTime:0.007644s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001728s ]
  8. SELECT * FROM `article` WHERE `id` = 494586 LIMIT 1 [ RunTime:0.018730s ]
  9. UPDATE `article` SET `lasttime` = 1783043162 WHERE `id` = 494586 [ RunTime:0.033619s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.004157s ]
  11. SELECT * FROM `article` WHERE `id` < 494586 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001237s ]
  12. SELECT * FROM `article` WHERE `id` > 494586 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001015s ]
  13. SELECT * FROM `article` WHERE `id` < 494586 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.019197s ]
  14. SELECT * FROM `article` WHERE `id` < 494586 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.029769s ]
  15. SELECT * FROM `article` WHERE `id` < 494586 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.057607s ]
0.283981s