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漏洞预警 | Linux kernel Open vSwitch本地权限提升漏洞

  • 2026-08-18 23:12:04
漏洞预警 | Linux kernel Open vSwitch本地权限提升漏洞
0x00 漏洞编号

  • CVE-2026-64531

0x01 危险等级
  • 高危
0x02 漏洞概述

Open vSwitch是Linux内核中的开源虚拟交换机实现，被广泛应用于云平台、虚拟化网络的软件定义网络数据平面，支持隧道、流表、conntrack等高级特性。

0x03 漏洞详情
CVE-2026-64531
漏洞类型：本地权限提升
影响：获取root权限
简述：Linux Kernel Open vSwitch存在本地权限提升漏洞，由于其内核在处理特定Netlink消息时，对隧道元数据与嵌套action长度的边界检查缺失，攻击者可通过CLONE包含大量小型conntrack action，使生成的嵌套action超过65535字节，触发Netlink属性nla_len字段长度截断，使后续action数据被错误解析，进一步造成内核指针泄露和内存破坏，最终实现从普通用户到root的本地权限提升。
0x04 影响版本

  • 5.15.180 <= Linux Kernel <= 5.15.211

  • 6.1.132 <= Linux Kernel <= 6.1.177

  • 6.6.84 <= Linux Kernel <= 6.6.144

  • 6.12.20 <= Linux Kernel <= 6.12.96

  • 6.13.8 <= Linux Kernel <= 6.13.12

  • 6.14 <= Linux Kernel <= 6.17

  • 6.18.0 <= Linux Kernel <= 6.18.39

  • Linux Kernel 6.19

  • Linux Kernel 7.0

  • 7.1.0 <= Linux Kernel <= 7.1.4

0x05 POC状态

  • 已公开

0x06 修复建议

目前官方已发布漏洞修复版本，建议用户升级到安全版本：
https://www.kernel.org/
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  1. 请求信息 : 2026-08-21 16:49:30 HTTP/2.0 GET : https://f.mffb.com.cn/a/510157.html
  2. 运行时间 : 0.232697s [ 吞吐率：4.30req/s ] 内存消耗：4,468.56kb 文件加载：140
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  4. 会话信息 : SESSION_ID=c6c3c863c6d40c48dd53ede76916f4b6
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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.001154s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001664s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000749s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.013312s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001406s ]
  6. SELECT * FROM `set` [ RunTime:0.000648s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001572s ]
  8. SELECT * FROM `article` WHERE `id` = 510157 LIMIT 1 [ RunTime:0.000994s ]
  9. UPDATE `article` SET `lasttime` = 1787302170 WHERE `id` = 510157 [ RunTime:0.013973s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000719s ]
  11. SELECT * FROM `article` WHERE `id` < 510157 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001264s ]
  12. SELECT * FROM `article` WHERE `id` > 510157 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003347s ]
  13. SELECT * FROM `article` WHERE `id` < 510157 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004065s ]
  14. SELECT * FROM `article` WHERE `id` < 510157 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001833s ]
  15. SELECT * FROM `article` WHERE `id` < 510157 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002643s ]
0.236814s