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CVE-2025-21816— Linux kernel 安全漏洞

一分钟漏洞结论

影响对象
Linux Linux
利用判断
尚无明确在野利用证据,仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本;无法立即升级时,限制受影响服务暴露并加强监测。

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞,该漏洞源于CPUHP_AP_HRTIMERS_DYING阶段后仍可能由离线CPU执行唤醒,导致带宽计时器被忽略。

AI 预测 5.5 利用难度: 中等 EPSS 0.21% · P10

可能的 ATT&CK 技术 1 AI

T1564.004 · NTFS File Attributes

影响版本矩阵 22

厂商产品 版本范围状态
Linux Linux 75b5016ce325f1ef9c63e5398a1064cf8a7a7354< 82ac6adbbb2aad14548a71d5e2e37f4964a15e38 affected
53f408cad05bb987af860af22f4151e5a18e6ee8< 63815bef47ec25f5a125019ca480882481ee1553 affected
5c0930ccaad5a74d74e8b18b648c5eb21ed2fe94< e456a88bddae4030ba962447bb84be6669f2a0c1 affected
5c0930ccaad5a74d74e8b18b648c5eb21ed2fe94< 2aecec58e9040ce3d2694707889f9914a2374955 affected
5c0930ccaad5a74d74e8b18b648c5eb21ed2fe94< 53dac345395c0d2493cbc2f4c85fe38aef5b63f5 affected
9a2fc41acb69dd4e2a58d0c04346c3333c2341fc affected
54d0d83a53508d687fd4a225f8aa1f18559562d0 affected
7f4c89400d2997939f6971c7981cc780a219e36b affected
… +14 条更多
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一、 漏洞 CVE-2025-21816 基础信息

漏洞信息

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Vulnerability Title
hrtimers: Force migrate away hrtimers queued after CPUHP_AP_HRTIMERS_DYING
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: hrtimers: Force migrate away hrtimers queued after CPUHP_AP_HRTIMERS_DYING hrtimers are migrated away from the dying CPU to any online target at the CPUHP_AP_HRTIMERS_DYING stage in order not to delay bandwidth timers handling tasks involved in the CPU hotplug forward progress. However wakeups can still be performed by the outgoing CPU after CPUHP_AP_HRTIMERS_DYING. Those can result again in bandwidth timers being armed. Depending on several considerations (crystal ball power management based election, earliest timer already enqueued, timer migration enabled or not), the target may eventually be the current CPU even if offline. If that happens, the timer is eventually ignored. The most notable example is RCU which had to deal with each and every of those wake-ups by deferring them to an online CPU, along with related workarounds: _ e787644caf76 (rcu: Defer RCU kthreads wakeup when CPU is dying) _ 9139f93209d1 (rcu/nocb: Fix RT throttling hrtimer armed from offline CPU) _ f7345ccc62a4 (rcu/nocb: Fix rcuog wake-up from offline softirq) The problem isn't confined to RCU though as the stop machine kthread (which runs CPUHP_AP_HRTIMERS_DYING) reports its completion at the end of its work through cpu_stop_signal_done() and performs a wake up that eventually arms the deadline server timer: WARNING: CPU: 94 PID: 588 at kernel/time/hrtimer.c:1086 hrtimer_start_range_ns+0x289/0x2d0 CPU: 94 UID: 0 PID: 588 Comm: migration/94 Not tainted Stopper: multi_cpu_stop+0x0/0x120 <- stop_machine_cpuslocked+0x66/0xc0 RIP: 0010:hrtimer_start_range_ns+0x289/0x2d0 Call Trace: <TASK> start_dl_timer enqueue_dl_entity dl_server_start enqueue_task_fair enqueue_task ttwu_do_activate try_to_wake_up complete cpu_stopper_thread Instead of providing yet another bandaid to work around the situation, fix it in the hrtimers infrastructure instead: always migrate away a timer to an online target whenever it is enqueued from an offline CPU. This will also allow to revert all the above RCU disgraceful hacks.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞,该漏洞源于CPUHP_AP_HRTIMERS_DYING阶段后仍可能由离线CPU执行唤醒,导致带宽计时器被忽略。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
Linux Linux 75b5016ce325f1ef9c63e5398a1064cf8a7a7354 ~ 82ac6adbbb2aad14548a71d5e2e37f4964a15e38 -
Linux Linux 6.7 -

二、漏洞 CVE-2025-21816 的公开POC

# POC 描述 源链接 神龙链接
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三、漏洞 CVE-2025-21816 的情报信息

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CVE-2025-21816 补丁与修复 (3)

同批安全公告 · Linux · 2025-02-27 · 共 177 条

CVE-2025-21805 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2025-21796 9.8 CRITICAL Linux kernel 资源管理错误漏洞
CVE-2025-21707 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2025-21748 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2024-58006 9.6 CRITICAL Linux kernel 安全漏洞
CVE-2024-57999 8.8 HIGH Linux kernel 安全漏洞
CVE-2025-21735 8.8 HIGH Linux kernel 安全漏洞
CVE-2024-57997 8.8 HIGH Linux kernel 安全漏洞
CVE-2024-57995 8.8 HIGH Linux kernel 安全漏洞
CVE-2025-21710 8.2 HIGH Linux kernel 安全漏洞
CVE-2025-21766 8.1 HIGH Linux kernel 安全漏洞
CVE-2024-57973 8.1 HIGH Linux kernel 安全漏洞
CVE-2025-21765 8.1 HIGH Linux kernel 安全漏洞
CVE-2025-21760 8.1 HIGH Linux kernel 资源管理错误漏洞
CVE-2025-21762 8.1 HIGH Linux kernel 资源管理错误漏洞
CVE-2024-58010 7.8 HIGH Linux kernel 安全漏洞
CVE-2024-58008 7.8 HIGH Linux kernel 安全漏洞
CVE-2025-21764 7.8 HIGH Linux kernel 资源管理错误漏洞
CVE-2025-21791 7.8 HIGH Linux kernel 资源管理错误漏洞
CVE-2025-21763 7.8 HIGH Linux kernel 资源管理错误漏洞

显示前 20 条,共 177 条。 查看全部 &rarr; →

IV. Related Vulnerabilities

V. Comments for CVE-2025-21816

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