CVE-2025-39735— 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ea_get未正确处理大尺寸扩展属性，可能导致缓冲区溢出。
影响版本矩阵 30
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 6e39b681d1eb16f408493bf5023788b57f68998c< 3d6fd5b9c6acbc005e53d0211c7381f566babec1 |
affected |
bbf3f1fd8a0ac7df1db36a9b9e923041a14369f2< 50afcee7011155933d8d5e8832f52eeee018cfd3 |
affected | ||
27a93c45e16ac25a0e2b5e5668e2d1beca56a478< 78c9cbde8880ec02d864c166bcb4fe989ce1d95f |
affected | ||
9c356fc32a4480a2c0e537a05f2a8617633ddad0< 46e2c031aa59ea65128991cbca474bd5c0c2ecdb |
affected | ||
9353cdf28d4c5c0ff19c5df7fbf81ea774de43a4< a8c31808925b11393a6601f534bb63bac5366bab |
affected | ||
8c505ebeed8045b488b2e60b516c752b851f8437< 0beddc2a3f9b9cf7d8887973041e36c2d0fa3652 |
affected | ||
d9f9d96136cba8fedd647d2c024342ce090133c2< 16d3d36436492aa248b2d8045e75585ebcc2f34d |
affected | ||
d9f9d96136cba8fedd647d2c024342ce090133c2< 5263822558a8a7c0d0248d5679c2dcf4d5cda61f |
affected | ||
| … +22 条更多 | |||
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一、 漏洞 CVE-2025-39735 基础信息
漏洞信息
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Vulnerability Title
jfs: fix slab-out-of-bounds read in ea_get()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
jfs: fix slab-out-of-bounds read in ea_get()
During the "size_check" label in ea_get(), the code checks if the extended
attribute list (xattr) size matches ea_size. If not, it logs
"ea_get: invalid extended attribute" and calls print_hex_dump().
Here, EALIST_SIZE(ea_buf->xattr) returns 4110417968, which exceeds
INT_MAX (2,147,483,647). Then ea_size is clamped:
int size = clamp_t(int, ea_size, 0, EALIST_SIZE(ea_buf->xattr));
Although clamp_t aims to bound ea_size between 0 and 4110417968, the upper
limit is treated as an int, causing an overflow above 2^31 - 1. This leads
"size" to wrap around and become negative (-184549328).
The "size" is then passed to print_hex_dump() (called "len" in
print_hex_dump()), it is passed as type size_t (an unsigned
type), this is then stored inside a variable called
"int remaining", which is then assigned to "int linelen" which
is then passed to hex_dump_to_buffer(). In print_hex_dump()
the for loop, iterates through 0 to len-1, where len is
18446744073525002176, calling hex_dump_to_buffer()
on each iteration:
for (i = 0; i < len; i += rowsize) {
linelen = min(remaining, rowsize);
remaining -= rowsize;
hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
linebuf, sizeof(linebuf), ascii);
...
}
The expected stopping condition (i < len) is effectively broken
since len is corrupted and very large. This eventually leads to
the "ptr+i" being passed to hex_dump_to_buffer() to get closer
to the end of the actual bounds of "ptr", eventually an out of
bounds access is done in hex_dump_to_buffer() in the following
for loop:
for (j = 0; j < len; j++) {
if (linebuflen < lx + 2)
goto overflow2;
ch = ptr[j];
...
}
To fix this we should validate "EALIST_SIZE(ea_buf->xattr)"
before it is utilised.
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:N/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ea_get未正确处理大尺寸扩展属性，可能导致缓冲区溢出。
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-2025-39735 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-39735 其他参考 (7)
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-2025-37785 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37893 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37838 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39688 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38479 | 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-2025-40325 | 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-2025-40014 | 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 |
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IV. Related Vulnerabilities
V. Comments for CVE-2025-39735
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