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GhostLock:Linux内核潜伏15年本地提权漏洞

  • 2026-08-20 10:31:16
GhostLock:Linux内核潜伏15年本地提权漏洞
CVE-2026-43499CVSS 7.8 HIGH公开PoC容器逃逸
漏洞概述
漏洞编号
CVE-2026-43499
漏洞类型
本地提权 (Local Privilege Escalation) / 容器逃逸
CVSS评分
7.8 高危
攻击向量
本地 (AV:L)
权限要求
低权限用户 (PR:L)
影响产品
Linux内核 2.6.39 - 7.0.4 (约15年跨度)
漏洞代码
kernel/locking/rtmutex.c - remove_waiter()
技术细节

GhostLock是一个存在于Linux内核futex/rtmutex子系统中的use-after-free(UAF)漏洞,代号取自"Ghost"(幽灵)和"Lock"(锁)之意。该漏洞在代码中潜伏长达15年,自2011年Linux 2.6.39引入以来,几乎所有主流发行版都受到影响。

漏洞根因在于remove_waiter()函数对运行时上下文的错误假设:该函数在清理rtmutex等待者状态时,假设current(当前运行线程)始终是需要清理的等待者。然而在Requeue-PI(优先级继承futex重排队)路径中,rt_mutex_start_proxy_lock()会代表另一个睡眠线程进行清理,此时current是请求线程而非实际等待者。

__rt_mutex_start_proxy_lock()因死锁检测返回-EDEADLK时,remove_waiter()错误地清除了current->pi_blocked_on,而非正确的waiter->task->pi_blocked_on。这导致实际等待者任务的pi_blocked_on指针悬空指向已销毁的栈帧。

c
/* 漏洞代码位置: kernel/locking/rtmutex.c - remove_waiter() */
/* 错误假设:current 总是需要清理的等待者 */
static void remove_waiter(struct rtmutex *lock,
                           struct rt_mutex_waiter *waiter)
{
   struct task_struct *task = waiter->task;
   
   /* 在Requeue-PI路径中,current不是等待者 */
   /* 这里错误地操作了 current 的 pi_blocked_on */
   raw_spin_lock(&task->pi_lock);
   plist_del(&waiter->list, &lock->waiters);
   task->pi_blocked_on = NULL;
   raw_spin_unlock(&task->pi_lock);
}

利用此漏洞的攻击者可以构造三线程PI依赖循环触发竞态条件,然后通过PR_SET_MM_MAP等系统调用在悬空栈位置放置伪造的rt_mutex_waiter对象,利用红黑树擦除操作获得受控指针写入原语,最终覆写inet6_protos[IPPROTO_UDP]等内核函数表,结合CPU entry area布局与ROP技术实现内核控制流劫持。

Use-After-Free竞态条件内核提权容器逃逸futex/rtmutex
攻击链分析
步骤一:触发竞态条件
攻击者构造三线程PI依赖循环,通过futex_requeue()操作触发deadlock检测,使__rt_mutex_start_proxy_lock()返回-EDEADLK
步骤二:UAF指针建立
remove_waiter()错误地清除current->pi_blocked_on而非waiter->task->pi_blocked_on,建立指向已释放栈帧的悬空指针
步骤三:堆喷受控写入
通过PR_SET_MM_MAP等系统调用在已释放栈位置喷射伪造的rt_mutex_waiter对象,获得受控内核写入能力
步骤四:函数表劫持
利用红黑树擦除操作覆写inet6_protos[IPPROTO_UDP]等关键函数表
步骤五:权限提升/容器逃逸
结合CPU entry area布局与ROP链执行任意代码,绕过内核权限检查获得root权限,或从容器逃逸到宿主机
PoC / 利用代码
⚠ 仅供安全研究
以下代码仅用于安全研究和授权测试,未经授权使用属于违法行为。Nebula Security已发布完整利用代码。

Nebula Security发布的PoC可在约5秒内完成权限提升,可靠性高达97%,同时支持容器逃逸。以下为核心利用思路的伪代码展示:

python
# GhostLock 漏洞利用核心思路 (伪代码)
# 完整PoC: https://github.com/J-aaeyoung/bad-epoll (由Jaeyoung Chung发布)

import threading
import os

# 1. 构造三线程PI依赖循环触发UAF
def trigger_uaf():
   # 创建三个线程建立PI依赖关系
   # 通过futex_requeue操作触发deadlock
   # 使remove_waiter()在错误上下文执行
   threads = []
   for i in range(3):
       t = threading.Thread(target=pi_chain_worker)
       threads.append(t)
   
   # 等待竞态条件窗口(约6条CPU指令)
   for t in threads:
       t.start()
   
   # 2. 内存泄漏绕过KASLR
   leak = memory_leak_primitive()
   kernel_base = leak.get_kernel_base()
   
   # 3. 堆喷伪造rt_mutex_waiter结构
   heap_spray(kernel_base)
   
   # 4. ROP链执行权限提升
   execute_rop_chain(kernel_base)

# 容器逃逸: 利用同一漏洞从容器内逃逸到宿主机
def container_escape():
   # 容器内同样拥有本地用户权限
   # 漏洞利用不依赖特殊capabilities
   trigger_uaf()
   # 成功后将获得宿主机root权限
bash
# 检测系统是否受影响 (需root)
uname -r
# 检查内核版本是否在受影响范围 (2.6.39 - 7.0.4)

# 检查是否已应用修复补丁
cat /proc/version
# 或查看是否包含 commit 3bfdc63936dd

# 检查PI-futex状态 (漏洞需要PI-futex开启)
grep -i futex /boot/config-$(uname -r)
# CONFIG_RT_MUTEXES=y & CONFIG_FUTEX=y 通常为默认开启
影响范围
Linux内核版本2.6.39 - 7.0.4(约15年全部主流版本)
主流发行版Ubuntu (LTS 24.04/22.04/20.04待确认)、Debian、Fedora、Arch Linux等
Red Hat声明RHEL 6-10 "Not Affected"(部分内核配置不包含该代码路径)
云平台AWS EC2、GCP、Azure VM等所有Linux云主机
容器环境Docker、Kubernetes集群(Pod隔离可被突破)
特殊说明漏洞需要PI-futex功能开启,大多数内核默认启用;自定义内核如禁用相关选项可能不受影响
防御指南
修复与缓解
  • 升级Linux内核至最新版本,等待各发行版推送包含commit 3bfdc63936dd的安全更新
  • Ubuntu用户:关注官方安全公告,等待LTS版本修复推送
  • 限制本地用户权限:避免向不可信用户分配shell或sudo权限
  • 容器环境:确保容器不以privileged模式运行,启用seccomp限制
  • 云平台:启用 Mandatory Access Control (SELinux/AppArmor)
检测方法
  • 检查dmesg日志中是否存在可疑的内核oops或UAF警告
  • 监控/proc/$pid/目录下异常进程
  • 使用Lynis等工具审计内核安全配置
  • 容器逃逸检测:监控异常的系统调用模式
⚡ 特别提醒
该漏洞PoC已公开,可靠性高达97%。鉴于漏洞严重性和利用简易性,多租户云环境、CI/CD平台、有容器化部署的企业应优先修复。原始补丁(commit 3bfdc63936dd)可能引入回归漏洞CVE-2026-53166(CVSS 5.5),建议关注完整修复版本。
法律声明
以上信息仅供安全研究和授权渗透测试使用。未经授权对他人系统进行测试属于违法行为。

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  1. CONNECT:[ UseTime:0.000510s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000935s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001166s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000270s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000705s ]
  6. SELECT * FROM `set` [ RunTime:0.000264s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000789s ]
  8. SELECT * FROM `article` WHERE `id` = 504508 LIMIT 1 [ RunTime:0.000503s ]
  9. UPDATE `article` SET `lasttime` = 1787331141 WHERE `id` = 504508 [ RunTime:0.011210s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000297s ]
  11. SELECT * FROM `article` WHERE `id` < 504508 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000614s ]
  12. SELECT * FROM `article` WHERE `id` > 504508 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000431s ]
  13. SELECT * FROM `article` WHERE `id` < 504508 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013500s ]
  14. SELECT * FROM `article` WHERE `id` < 504508 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012745s ]
  15. SELECT * FROM `article` WHERE `id` < 504508 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001206s ]
0.156040s