当前位置:首页>Linux>【已复现】漏洞通告 | Linux内核Open vSwitch本地提权漏洞漏洞(CVE-2026-64531)

【已复现】漏洞通告 | Linux内核Open vSwitch本地提权漏洞漏洞(CVE-2026-64531)

  • 2026-08-20 16:54:42
【已复现】漏洞通告 | Linux内核Open vSwitch本地提权漏洞漏洞(CVE-2026-64531)

1

漏洞描述

Linux内核Open vSwitch本地提权漏洞(CVE-2026-64531)是由于内核在处理Open vSwitch数据路径的流动作时,对嵌套动作的长度字段(nla_len)存在整数回绕问题。当攻击者构造超大的嵌套动作流,使长度超过16位字段的最大值(65535字节)时,长度字段会发生回绕,导致内核解析器错误地解析后续动作数据,进而引发内核指针泄露和内存破坏。攻击者利用这一漏洞,可在本地低权限环境下,通过构造特制的网络数据包,触发内核内存损坏,最终实现从普通用户权限到root权限的本地提权。该漏洞影响多个Linux内核版本及主流发行版,需及时升级内核或采取禁用Open vSwitch模块等缓解措施。

2

影响范

受影响内核版本:

5.15分支:5.15.180至5.15.211
6.1分支:6.1.132至6.1.177
6.6分支:6.6.84至6.6.144
6.12分支:6.12.20至6.12.96
6.13分支:6.13.8至6.13.12(已停止维护,无修复版本)
6.14至6.17分支:所有正式版本(已停止维护,无修复版本)
6.18分支:6.18.0至6.18.39
6.19分支:所有正式版本(已停止维护,无修复版本)
7.0分支:所有正式版本(已停止维护,无修复版本)
7.1分支:7.1.0至7.1.4

受影响发行版:

AlmaLinux 9.7、9.8、10.1、10.2
Alpine Linux 3.22、3.23、3.24
Amazon Linux 2023
Arch Linux
CentOS Stream 9、10
Debian 12、13
Fedora 40至44
Kali Linux 2026.1
Linux Mint 22.3
NixOS 24.11、25.05、25.11、26.05
openSUSE Tumbleweed
Pop!_OS 22.04、24.04
Rocky Linux 9、10
Ubuntu 22.04、24.04(Desktop和Server版本)

3

漏洞详情

漏洞详情
漏洞编号
CVE-2026-64531
漏洞名称
Linux内核Open vSwitch本地提权漏洞
评级
高危
CVSS 3.1分数
7.8
威胁类型
权限提升
利用情况
更可能被利用
公开状态
POC、EXP已公开
在野利用
未发现
危害描述:攻击者通过触发内核内存破坏(整数回绕导致解析流错位)和任意读写原语,覆写内核关键数据结构(如进程凭据 task->cred),将攻击者所在进程的 uid/gid 降为 0,或写入恶意 sudoers 规则,最终实现本地 root 权限的获取,完全控制主机。
参考链接: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3f1f755366687d051174739fb99f7d560202f60b
https://git.kernel.org/stable/c/3f1f755366687d051174739fb99f7d560202f60b
https://github.com/torvalds/linux/commit/a1e64addf3ff9257b45b78bc7d743781c3f41340
https://github.com/torvalds/linux/commit/3f1f755366687d051174739fb99f7d560202f60b
https://nvd.nist.gov/vuln/detail/CVE-2026-64531
https://github.com/manizada/OVSwrap

4

漏洞复现

中成信息安全实验室已复现Linux内核Open vSwitch本地提权漏洞,验证如下。

5

修复建议

升级内核版本
官方已发布修复补丁,建议尽快升级到以下安全版本:
5.15分支:5.15.212及以上
6.1分支:6.1.178及以上
6.6分支:6.6.145及以上
6.12分支:6.12.97及以上
6.18分支:6.18.40及以上
7.1分支:7.1.5及以上
主线内核:7.2-rc4及以上
临时缓解措施
若暂时无法升级内核,可采取以下措施降低风险:
禁用Open vSwitch模块:
echo "install openvswitch /bin/false" | sudo tee /etc/modprobe.d/block-cve-2026-64531.confsudo rmmod openvswitch 2>/dev/null
禁用非特权用户命名空间:
echo "user.max_user_namespaces = 0" | sudo tee -a /etc/sysctl.confsudo sysctl -p
检查系统状态:
uname -r
检查Open vSwitch模块是否加载:
lsmod | grep openvswitch
注意事项:
  • 升级内核前建议备份重要数据,避免操作失误导致系统异常。
  • 若系统依赖Open vSwitch功能,禁用模块可能影响网络功能,需评估业务影响后再操作。
  • 临时缓解措施仅能降低风险,最终仍需通过升级内核彻底修复漏洞。

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  1. CONNECT:[ UseTime:0.001279s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001969s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001202s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000725s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001452s ]
  6. SELECT * FROM `set` [ RunTime:0.000618s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001656s ]
  8. SELECT * FROM `article` WHERE `id` = 508572 LIMIT 1 [ RunTime:0.001117s ]
  9. UPDATE `article` SET `lasttime` = 1787323880 WHERE `id` = 508572 [ RunTime:0.003621s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000604s ]
  11. SELECT * FROM `article` WHERE `id` < 508572 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001204s ]
  12. SELECT * FROM `article` WHERE `id` > 508572 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001212s ]
  13. SELECT * FROM `article` WHERE `id` < 508572 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002290s ]
  14. SELECT * FROM `article` WHERE `id` < 508572 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004098s ]
  15. SELECT * FROM `article` WHERE `id` < 508572 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002934s ]
0.154289s