CVE-2025-71069— 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，该漏洞源于目录深度值损坏时，重命名操作失败后未更新dentry缓存，可能导致缓存不一致。
可能的 ATT&CK 技术 1 AI
T1562.001影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 7e01e7ad746bc8198a8b46163ddc73a1c7d22339< 7f2bae0c881aa1e0a6318756df692cc13df2cc83 |
affected |
7e01e7ad746bc8198a8b46163ddc73a1c7d22339< 3d95ed8cf980fdfa67a3ab9491357521ae576168 |
affected | ||
7e01e7ad746bc8198a8b46163ddc73a1c7d22339< 64587ab4d1f16fc94f70e04fa87b2e3f69f8a7bb |
affected | ||
7e01e7ad746bc8198a8b46163ddc73a1c7d22339< 3d65e27e57aaa9d66709fda4cbfb62a87c04a3f5 |
affected | ||
7e01e7ad746bc8198a8b46163ddc73a1c7d22339< c89845fae250efdd59c1d4ec60e9e1c652cee4b6 |
affected | ||
7e01e7ad746bc8198a8b46163ddc73a1c7d22339< 0dde30753c1e8648665dbe069d814e540ce2fd37 |
affected | ||
7e01e7ad746bc8198a8b46163ddc73a1c7d22339< d33f89b34aa313f50f9a512d58dd288999f246b0 |
affected | ||
4.2 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2025-71069 基础信息
漏洞信息
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Vulnerability Title
f2fs: invalidate dentry cache on failed whiteout creation
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
f2fs: invalidate dentry cache on failed whiteout creation
F2FS can mount filesystems with corrupted directory depth values that
get runtime-clamped to MAX_DIR_HASH_DEPTH. When RENAME_WHITEOUT
operations are performed on such directories, f2fs_rename performs
directory modifications (updating target entry and deleting source
entry) before attempting to add the whiteout entry via f2fs_add_link.
If f2fs_add_link fails due to the corrupted directory structure, the
function returns an error to VFS, but the partial directory
modifications have already been committed to disk. VFS assumes the
entire rename operation failed and does not update the dentry cache,
leaving stale mappings.
In the error path, VFS does not call d_move() to update the dentry
cache. This results in new_dentry still pointing to the old inode
(new_inode) which has already had its i_nlink decremented to zero.
The stale cache causes subsequent operations to incorrectly reference
the freed inode.
This causes subsequent operations to use cached dentry information that
no longer matches the on-disk state. When a second rename targets the
same entry, VFS attempts to decrement i_nlink on the stale inode, which
may already have i_nlink=0, triggering a WARNING in drop_nlink().
Example sequence:
1. First rename (RENAME_WHITEOUT): file2 → file1
- f2fs updates file1 entry on disk (points to inode 8)
- f2fs deletes file2 entry on disk
- f2fs_add_link(whiteout) fails (corrupted directory)
- Returns error to VFS
- VFS does not call d_move() due to error
- VFS cache still has: file1 → inode 7 (stale!)
- inode 7 has i_nlink=0 (already decremented)
2. Second rename: file3 → file1
- VFS uses stale cache: file1 → inode 7
- Tries to drop_nlink on inode 7 (i_nlink already 0)
- WARNING in drop_nlink()
Fix this by explicitly invalidating old_dentry and new_dentry when
f2fs_add_link fails during whiteout creation. This forces VFS to
refresh from disk on subsequent operations, ensuring cache consistency
even when the rename partially succeeds.
Reproducer:
1. Mount F2FS image with corrupted i_current_depth
2. renameat2(file2, file1, RENAME_WHITEOUT)
3. renameat2(file3, file1, 0)
4. System triggers WARNING in drop_nlink()
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，该漏洞源于目录深度值损坏时，重命名操作失败后未更新dentry缓存，可能导致缓存不一致。
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-2025-71069 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 · 2026-01-13 · 共 93 条
| CVE-2025-71068 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68775 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68817 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68794 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68811 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68809 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-71095 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-71093 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68818 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71072 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68799 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68803 | 8.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68819 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68815 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71066 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68822 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68792 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68793 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71074 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68795 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 93 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-71069
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