CVE-2025-39723— 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，该漏洞源于未正确更新传输值，可能导致数据损坏。
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 288ace2f57c9d06dd2e42bd80d03747d879a4068< f08c80af3c9a9849cd178b4843b7c01d103506a1 |
affected |
288ace2f57c9d06dd2e42bd80d03747d879a4068< 387164a2b97e1f5404c6d0049a7409bac7d2bc5b |
affected | ||
288ace2f57c9d06dd2e42bd80d03747d879a4068< a3de58b12ce074ec05b8741fa28d62ccb1070468 |
affected | ||
6.10 |
affected | ||
< 6.10 |
unaffected | ||
6.12.44≤ 6.12.* |
unaffected | ||
6.16.4≤ 6.16.* |
unaffected | ||
6.17≤ * |
unaffected |
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一、 漏洞 CVE-2025-39723 基础信息
漏洞信息
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Vulnerability Title
netfs: Fix unbuffered write error handling
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
netfs: Fix unbuffered write error handling
If all the subrequests in an unbuffered write stream fail, the subrequest
collector doesn't update the stream->transferred value and it retains its
initial LONG_MAX value. Unfortunately, if all active streams fail, then we
take the smallest value of { LONG_MAX, LONG_MAX, ... } as the value to set
in wreq->transferred - which is then returned from ->write_iter().
LONG_MAX was chosen as the initial value so that all the streams can be
quickly assessed by taking the smallest value of all stream->transferred -
but this only works if we've set any of them.
Fix this by adding a flag to indicate whether the value in
stream->transferred is valid and checking that when we integrate the
values. stream->transferred can then be initialised to zero.
This was found by running the generic/750 xfstest against cifs with
cache=none. It splices data to the target file. Once (if) it has used up
all the available scratch space, the writes start failing with ENOSPC.
This causes ->write_iter() to fail. However, it was returning
wreq->transferred, i.e. LONG_MAX, rather than an error (because it thought
the amount transferred was non-zero) and iter_file_splice_write() would
then try to clean up that amount of pipe bufferage - leading to an oops
when it overran. The kernel log showed:
CIFS: VFS: Send error in write = -28
followed by:
BUG: kernel NULL pointer dereference, address: 0000000000000008
with:
RIP: 0010:iter_file_splice_write+0x3a4/0x520
do_splice+0x197/0x4e0
or:
RIP: 0010:pipe_buf_release (include/linux/pipe_fs_i.h:282)
iter_file_splice_write (fs/splice.c:755)
Also put a warning check into splice to announce if ->write_iter() returned
that it had written more than it was asked to.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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，该漏洞源于未正确更新传输值，可能导致数据损坏。
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-2025-39723 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 · 2025-09-05 · 共 60 条
| CVE-2025-39726 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39682 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38734 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39702 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39703 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38737 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39673 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39704 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39718 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39711 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39710 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39696 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39714 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39717 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39698 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39697 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38731 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39691 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39689 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39677 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 60 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-39723
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