CVE-2025-37785— 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ext4_empty_dir函数在检查dotdot目录时可能导致越界读取。
可能的 ATT&CK 技术 1 AI
T1406.004影响版本矩阵 20
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | ac27a0ec112a089f1a5102bc8dffc79c8c815571< 14da7dbecb430e35b5889da8dae7bef33173b351 |
affected |
ac27a0ec112a089f1a5102bc8dffc79c8c815571< e47f472a664d70a3d104a6c2a035cdff55a719b4 |
affected | ||
ac27a0ec112a089f1a5102bc8dffc79c8c815571< b7531a4f99c3887439d778afaf418d1a01a5f01b |
affected | ||
ac27a0ec112a089f1a5102bc8dffc79c8c815571< 89503e5eae64637d0fa2218912b54660effe7d93 |
affected | ||
ac27a0ec112a089f1a5102bc8dffc79c8c815571< 52a5509ab19a5d3afe301165d9b5787bba34d842 |
affected | ||
ac27a0ec112a089f1a5102bc8dffc79c8c815571< b47584c556444cf7acb66b26a62cbc348eb92b78 |
affected | ||
ac27a0ec112a089f1a5102bc8dffc79c8c815571< ac28c5684c1cdab650a7e5065b19e91577d37a4b |
affected | ||
ac27a0ec112a089f1a5102bc8dffc79c8c815571< 53bc45da8d8da92ec07877f5922b130562eb4b00 |
affected | ||
| … +12 条更多 | |||
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一、 漏洞 CVE-2025-37785 基础信息
漏洞信息
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Vulnerability Title
ext4: fix OOB read when checking dotdot dir
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix OOB read when checking dotdot dir
Mounting a corrupted filesystem with directory which contains '.' dir
entry with rec_len == block size results in out-of-bounds read (later
on, when the corrupted directory is removed).
ext4_empty_dir() assumes every ext4 directory contains at least '.'
and '..' as directory entries in the first data block. It first loads
the '.' dir entry, performs sanity checks by calling ext4_check_dir_entry()
and then uses its rec_len member to compute the location of '..' dir
entry (in ext4_next_entry). It assumes the '..' dir entry fits into the
same data block.
If the rec_len of '.' is precisely one block (4KB), it slips through the
sanity checks (it is considered the last directory entry in the data
block) and leaves "struct ext4_dir_entry_2 *de" point exactly past the
memory slot allocated to the data block. The following call to
ext4_check_dir_entry() on new value of de then dereferences this pointer
which results in out-of-bounds mem access.
Fix this by extending __ext4_check_dir_entry() to check for '.' dir
entries that reach the end of data block. Make sure to ignore the phony
dir entries for checksum (by checking name_len for non-zero).
Note: This is reported by KASAN as use-after-free in case another
structure was recently freed from the slot past the bound, but it is
really an OOB read.
This issue was found by syzkaller tool.
Call Trace:
[ 38.594108] BUG: KASAN: slab-use-after-free in __ext4_check_dir_entry+0x67e/0x710
[ 38.594649] Read of size 2 at addr ffff88802b41a004 by task syz-executor/5375
[ 38.595158]
[ 38.595288] CPU: 0 UID: 0 PID: 5375 Comm: syz-executor Not tainted 6.14.0-rc7 #1
[ 38.595298] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 38.595304] Call Trace:
[ 38.595308] <TASK>
[ 38.595311] dump_stack_lvl+0xa7/0xd0
[ 38.595325] print_address_description.constprop.0+0x2c/0x3f0
[ 38.595339] ? __ext4_check_dir_entry+0x67e/0x710
[ 38.595349] print_report+0xaa/0x250
[ 38.595359] ? __ext4_check_dir_entry+0x67e/0x710
[ 38.595368] ? kasan_addr_to_slab+0x9/0x90
[ 38.595378] kasan_report+0xab/0xe0
[ 38.595389] ? __ext4_check_dir_entry+0x67e/0x710
[ 38.595400] __ext4_check_dir_entry+0x67e/0x710
[ 38.595410] ext4_empty_dir+0x465/0x990
[ 38.595421] ? __pfx_ext4_empty_dir+0x10/0x10
[ 38.595432] ext4_rmdir.part.0+0x29a/0xd10
[ 38.595441] ? __dquot_initialize+0x2a7/0xbf0
[ 38.595455] ? __pfx_ext4_rmdir.part.0+0x10/0x10
[ 38.595464] ? __pfx___dquot_initialize+0x10/0x10
[ 38.595478] ? down_write+0xdb/0x140
[ 38.595487] ? __pfx_down_write+0x10/0x10
[ 38.595497] ext4_rmdir+0xee/0x140
[ 38.595506] vfs_rmdir+0x209/0x670
[ 38.595517] ? lookup_one_qstr_excl+0x3b/0x190
[ 38.595529] do_rmdir+0x363/0x3c0
[ 38.595537] ? __pfx_do_rmdir+0x10/0x10
[ 38.595544] ? strncpy_from_user+0x1ff/0x2e0
[ 38.595561] __x64_sys_unlinkat+0xf0/0x130
[ 38.595570] do_syscall_64+0x5b/0x180
[ 38.595583] entry_SYSCALL_64_after_hwframe+0x76/0x7e
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ext4_empty_dir函数在检查dotdot目录时可能导致越界读取。
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-2025-37785 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
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CVE-2025-37785 补丁与修复 (1)
CVE-2025-37785 其他参考 (8)
同批安全公告 · Linux · 2025-04-18 · 共 23 条
| CVE-2025-39930 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40364 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37838 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37893 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39688 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39735 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37860 | Linux kernel 安全漏洞 | |
| CVE-2025-37925 | Linux kernel 安全漏洞 | |
| CVE-2025-38049 | Linux kernel 安全漏洞 | |
| CVE-2025-38104 | Linux kernel 安全漏洞 | |
| CVE-2025-38152 | Linux kernel 安全漏洞 | |
| CVE-2025-38240 | Linux kernel 安全漏洞 | |
| CVE-2025-38479 | Linux kernel 安全漏洞 | |
| CVE-2025-38575 | Linux kernel 安全漏洞 | |
| CVE-2025-38637 | Linux kernel 安全漏洞 | |
| CVE-2025-39728 | Linux kernel 安全漏洞 | |
| CVE-2025-39755 | Linux kernel 安全漏洞 | |
| CVE-2025-39778 | Linux kernel 安全漏洞 | |
| CVE-2025-39989 | Linux kernel 安全漏洞 | |
| CVE-2025-40014 | Linux kernel 安全漏洞 |
显示前 20 条，共 23 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-37785
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