CVE-2025-39684— 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comedi模块在do_insn_ioctl和do_insnlist_ioctl中使用未初始化内存。
可能的 ATT&CK 技术 1 AI
T1005 · Data from Local System影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | ed9eccbe8970f6eedc1b978c157caf1251a896d4< 868a1b68dcd9f2805bb86aa64862402f785d8c4a |
affected |
ed9eccbe8970f6eedc1b978c157caf1251a896d4< ff4a7c18799c7fe999fa56c5cf276e13866b8c1a |
affected | ||
ed9eccbe8970f6eedc1b978c157caf1251a896d4< d84f6e77ebe3359394df32ecd97e0d76a25283dc |
affected | ||
ed9eccbe8970f6eedc1b978c157caf1251a896d4< f3b0c9ec54736f3b8118f93a473d22e11ee65743 |
affected | ||
ed9eccbe8970f6eedc1b978c157caf1251a896d4< aecf0d557ddd95ce68193a5ee1dc4c87415ff08a |
affected | ||
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 3cd212e895ca2d58963fdc6422502b10dd3966bb |
affected | ||
2.6.29 |
affected | ||
< 2.6.29 |
unaffected | ||
| … +6 条更多 | |||
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一、 漏洞 CVE-2025-39684 基础信息
漏洞信息
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Vulnerability Title
comedi: Fix use of uninitialized memory in do_insn_ioctl() and do_insnlist_ioctl()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
comedi: Fix use of uninitialized memory in do_insn_ioctl() and do_insnlist_ioctl()
syzbot reports a KMSAN kernel-infoleak in `do_insn_ioctl()`. A kernel
buffer is allocated to hold `insn->n` samples (each of which is an
`unsigned int`). For some instruction types, `insn->n` samples are
copied back to user-space, unless an error code is being returned. The
problem is that not all the instruction handlers that need to return
data to userspace fill in the whole `insn->n` samples, so that there is
an information leak. There is a similar syzbot report for
`do_insnlist_ioctl()`, although it does not have a reproducer for it at
the time of writing.
One culprit is `insn_rw_emulate_bits()` which is used as the handler for
`INSN_READ` or `INSN_WRITE` instructions for subdevices that do not have
a specific handler for that instruction, but do have an `INSN_BITS`
handler. For `INSN_READ` it only fills in at most 1 sample, so if
`insn->n` is greater than 1, the remaining `insn->n - 1` samples copied
to userspace will be uninitialized kernel data.
Another culprit is `vm80xx_ai_insn_read()` in the "vm80xx" driver. It
never returns an error, even if it fails to fill the buffer.
Fix it in `do_insn_ioctl()` and `do_insnlist_ioctl()` by making sure
that uninitialized parts of the allocated buffer are zeroed before
handling each instruction.
Thanks to Arnaud Lecomte for their fix to `do_insn_ioctl()`. That fix
replaced the call to `kmalloc_array()` with `kcalloc()`, but it is not
always necessary to clear the whole buffer.
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comedi模块在do_insn_ioctl和do_insnlist_ioctl中使用未初始化内存。
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-2025-39684 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-39684 补丁与修复 (1)
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-2025-39697 | 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-2025-38731 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39696 | 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-2025-39684
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