CVE-2025-40105— 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断开连接的dentry，可能导致内存泄漏。
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | f1ee616214cb22410e939d963bbb2349c2570f02< b5abafd0aa8d7bcb935c8f91e4cfc2f2820759e4 |
affected |
f1ee616214cb22410e939d963bbb2349c2570f02< 20863bb7fbb016379f8227122edfabc5c799bc79 |
affected | ||
f1ee616214cb22410e939d963bbb2349c2570f02< 8004d4b8cbf1bd68a23c160d57287e177c82cc69 |
affected | ||
f1ee616214cb22410e939d963bbb2349c2570f02< 7e0c8aaf4e28918abded547a5147c7d52c4af7d2 |
affected | ||
f1ee616214cb22410e939d963bbb2349c2570f02< cebfbf40056a4d858b2a3ca59a69936d599bd209 |
affected | ||
f1ee616214cb22410e939d963bbb2349c2570f02< 620f3b0ede9c5cb4976cd0457d0b04ad551e5d6b |
affected | ||
f1ee616214cb22410e939d963bbb2349c2570f02< eadc49999fa994d6fbd70c332bd5d5051cc42261 |
affected | ||
f1ee616214cb22410e939d963bbb2349c2570f02< 56094ad3eaa21e6621396cc33811d8f72847a834 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2025-40105 基础信息
漏洞信息
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Vulnerability Title
vfs: Don't leak disconnected dentries on umount
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
vfs: Don't leak disconnected dentries on umount
When user calls open_by_handle_at() on some inode that is not cached, we
will create disconnected dentry for it. If such dentry is a directory,
exportfs_decode_fh_raw() will then try to connect this dentry to the
dentry tree through reconnect_path(). It may happen for various reasons
(such as corrupted fs or race with rename) that the call to
lookup_one_unlocked() in reconnect_one() will fail to find the dentry we
are trying to reconnect and instead create a new dentry under the
parent. Now this dentry will not be marked as disconnected although the
parent still may well be disconnected (at least in case this
inconsistency happened because the fs is corrupted and .. doesn't point
to the real parent directory). This creates inconsistency in
disconnected flags but AFAICS it was mostly harmless. At least until
commit f1ee616214cb ("VFS: don't keep disconnected dentries on d_anon")
which removed adding of most disconnected dentries to sb->s_anon list.
Thus after this commit cleanup of disconnected dentries implicitely
relies on the fact that dput() will immediately reclaim such dentries.
However when some leaf dentry isn't marked as disconnected, as in the
scenario described above, the reclaim doesn't happen and the dentries
are "leaked". Memory reclaim can eventually reclaim them but otherwise
they stay in memory and if umount comes first, we hit infamous "Busy
inodes after unmount" bug. Make sure all dentries created under a
disconnected parent are marked as disconnected as well.
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，该漏洞源于未正确处理断开连接的dentry，可能导致内存泄漏。
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-2025-40105 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2025-10-30 · 共 20 条
| CVE-2025-40099 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-40095 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40104 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40096 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40094 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40093 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40092 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40090 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40087 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40088 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40091 | Linux kernel 安全漏洞 | |
| CVE-2025-40086 | Linux kernel 安全漏洞 | |
| CVE-2025-40089 | Linux kernel 安全漏洞 | |
| CVE-2025-40097 | Linux kernel 安全漏洞 | |
| CVE-2025-40098 | Linux kernel 安全漏洞 | |
| CVE-2025-40101 | Linux kernel 安全漏洞 | |
| CVE-2025-40100 | Linux kernel 安全漏洞 | |
| CVE-2025-40102 | Linux kernel 安全漏洞 | |
| CVE-2025-40103 | Linux kernel 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2025-40105
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