CVE-2025-21813— 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，该漏洞源于未正确处理根连接，可能导致多个顶级组。
可能的 ATT&CK 技术 1 AI
T1496 · Resource Hijacking影响版本矩阵 9
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 12ead225b7996252a8bc1a49b03aad57c0794880< c6dd70e5b465a2b77c7a7c3d868736d302e29aec |
affected |
b729cc1ec21a5899b7879ccfbe1786664928d597< 6f449d8fa1808a7f9ee644866bbc079285dbefdd |
affected | ||
b729cc1ec21a5899b7879ccfbe1786664928d597< 868c9037df626b3c245ee26a290a03ae1f9f58d3 |
affected | ||
6.12.11< 6.12.14 |
affected | ||
6.13 |
affected | ||
< 6.13 |
unaffected | ||
6.12.14≤ 6.12.* |
unaffected | ||
6.13.3≤ 6.13.* |
unaffected | ||
| … +1 条更多 | |||
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一、 漏洞 CVE-2025-21813 基础信息
漏洞信息
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Vulnerability Title
timers/migration: Fix off-by-one root mis-connection
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
timers/migration: Fix off-by-one root mis-connection
Before attaching a new root to the old root, the children counter of the
new root is checked to verify that only the upcoming CPU's top group have
been connected to it. However since the recently added commit b729cc1ec21a
("timers/migration: Fix another race between hotplug and idle entry/exit")
this check is not valid anymore because the old root is pre-accounted
as a child to the new root. Therefore after connecting the upcoming
CPU's top group to the new root, the children count to be expected must
be 2 and not 1 anymore.
This omission results in the old root to not be connected to the new
root. Then eventually the system may run with more than one top level,
which defeats the purpose of a single idle migrator.
Also the old root is pre-accounted but not connected upon the new root
creation. But it can be connected to the new root later on. Therefore
the old root may be accounted twice to the new root. The propagation of
such overcommit can end up creating a double final top-level root with a
groupmask incorrectly initialized. Although harmless given that the final
top level roots will never have a parent to walk up to, this oddity
opportunistically reported the core issue:
WARNING: CPU: 8 PID: 0 at kernel/time/timer_migration.c:543 tmigr_requires_handle_remote
CPU: 8 UID: 0 PID: 0 Comm: swapper/8
RIP: 0010:tmigr_requires_handle_remote
Call Trace:
<IRQ>
? tmigr_requires_handle_remote
? hrtimer_run_queues
update_process_times
tick_periodic
tick_handle_periodic
__sysvec_apic_timer_interrupt
sysvec_apic_timer_interrupt
</IRQ>
Fix the problem by taking the old root into account in the children count
of the new root so the connection is not omitted.
Also warn when more than one top level group exists to better detect
similar issues in the future.
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，该漏洞源于未正确处理根连接，可能导致多个顶级组。
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
二、漏洞 CVE-2025-21813 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-21813 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 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-21813
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