CVE-2025-21823— 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，该漏洞源于未管理的ELP度量工作项可能导致无效内存访问。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | c833484e5f3872a38fe232c663586069d5ad9645< 1c334629176c2d644befc31a20d4bf75542f7631 |
affected |
c833484e5f3872a38fe232c663586069d5ad9645< a0019971f340ae02ba54cf1861f72da7e03e6b66 |
affected | ||
c833484e5f3872a38fe232c663586069d5ad9645< 3c0e0aecb78cb2a2ca1dc701982d08fedb088dc6 |
affected | ||
c833484e5f3872a38fe232c663586069d5ad9645< 781a06fd265a8151f7601122d9c2e985663828ff |
affected | ||
c833484e5f3872a38fe232c663586069d5ad9645< a7aa2317285806640c844acd4cd2cd768e395264 |
affected | ||
c833484e5f3872a38fe232c663586069d5ad9645< 0fdc3c166ac17b26014313fa2b93696354511b24 |
affected | ||
c833484e5f3872a38fe232c663586069d5ad9645< af264c2a9adc37f4bdf88ca7f3affa15d8c7de9e |
affected | ||
c833484e5f3872a38fe232c663586069d5ad9645< 8c8ecc98f5c65947b0070a24bac11e12e47cc65d |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2025-21823 基础信息
漏洞信息
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Vulnerability Title
batman-adv: Drop unmanaged ELP metric worker
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: Drop unmanaged ELP metric worker
The ELP worker needs to calculate new metric values for all neighbors
"reachable" over an interface. Some of the used metric sources require
locks which might need to sleep. This sleep is incompatible with the RCU
list iterator used for the recorded neighbors. The initial approach to work
around of this problem was to queue another work item per neighbor and then
run this in a new context.
Even when this solved the RCU vs might_sleep() conflict, it has a major
problems: Nothing was stopping the work item in case it is not needed
anymore - for example because one of the related interfaces was removed or
the batman-adv module was unloaded - resulting in potential invalid memory
accesses.
Directly canceling the metric worker also has various problems:
* cancel_work_sync for a to-be-deactivated interface is called with
rtnl_lock held. But the code in the ELP metric worker also tries to use
rtnl_lock() - which will never return in this case. This also means that
cancel_work_sync would never return because it is waiting for the worker
to finish.
* iterating over the neighbor list for the to-be-deactivated interface is
currently done using the RCU specific methods. Which means that it is
possible to miss items when iterating over it without the associated
spinlock - a behaviour which is acceptable for a periodic metric check
but not for a cleanup routine (which must "stop" all still running
workers)
The better approch is to get rid of the per interface neighbor metric
worker and handle everything in the interface worker. The original problems
are solved by:
* creating a list of neighbors which require new metric information inside
the RCU protected context, gathering the metric according to the new list
outside the RCU protected context
* only use rcu_trylock inside metric gathering code to avoid a deadlock
when the cancel_delayed_work_sync is called in the interface removal code
(which is called with the rtnl_lock held)
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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，该漏洞源于未管理的ELP度量工作项可能导致无效内存访问。
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-2025-21823 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-21823 补丁与修复 (5)
CVE-2025-21823 其他参考 (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-2025-21823
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