CVE-2026-64191— 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基金会开源的一款操作系统内核。 Linux kernel 2.6.33版本存在缓冲区溢出漏洞，该漏洞源于i2c: stub驱动在处理I2C_SMBUS_I2C_BLOCK_DATA传输时，未对data->block[0]进行有效长度验证，可能导致本地用户通过I2C_SMBUS ioctl进行越界读取或写入，造成栈缓冲区溢出。
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 4710317891e4824ce1510a6b5066abbd3e917750< 7e9072dbd5f2f17934751873450d2c22080ead80 |
affected |
4710317891e4824ce1510a6b5066abbd3e917750< 21e87f336ac6303fed54a69b1d0d79a23b25c8d0 |
affected | ||
4710317891e4824ce1510a6b5066abbd3e917750< 3fd225f3e4cd67ec8ddab1afed9da03c7c43537c |
affected | ||
4710317891e4824ce1510a6b5066abbd3e917750< 1c4ffe6b4f04365485ed58d64c9bb86b46fc9037 |
affected | ||
4710317891e4824ce1510a6b5066abbd3e917750< 4bd8635f28c135a08aac6badcd7d9b5cdb34335f |
affected | ||
4710317891e4824ce1510a6b5066abbd3e917750< 5f4d2bd028ebb6e4c09a9d64842546022321d4a7 |
affected | ||
4710317891e4824ce1510a6b5066abbd3e917750< 0526931b16e5a118d367b7bfce7d797e63f7ac69 |
affected | ||
4710317891e4824ce1510a6b5066abbd3e917750< 6036b5067a8199ba7a2dc7b377d4b9dd276d5f9e |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-64191 基础信息
漏洞信息
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Vulnerability Title
i2c: stub: Reject I2C block transfers with invalid length
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
i2c: stub: Reject I2C block transfers with invalid length
The I2C_SMBUS_I2C_BLOCK_DATA case in stub_xfer() uses data->block[0]
as the transfer length. The existing check only clamps it to avoid
overrunning the chip->words[256] register array, but does not validate
it against I2C_SMBUS_BLOCK_MAX (32), which is the limit of the union
i2c_smbus_data.block buffer (34 bytes total). The driver is a
development/test tool (CONFIG_I2C_STUB=m, not built by default)
that must be loaded with a chip_addr= parameter.
A local user with access to /dev/i2c-* can issue an I2C_SMBUS ioctl
with I2C_SMBUS_I2C_BLOCK_DATA and data->block[0] > 32, causing
stub_xfer() to read or write past the end of the union
i2c_smbus_data.block buffer:
BUG: KASAN: stack-out-of-bounds in stub_xfer (drivers/i2c/i2c-stub.c:223)
Read of size 1 at addr ffff88800abcfd92 by task exploit/81
Call Trace:
<TASK>
stub_xfer (drivers/i2c/i2c-stub.c:223)
__i2c_smbus_xfer (drivers/i2c/i2c-core-smbus.c:593)
i2c_smbus_xfer (drivers/i2c/i2c-core-smbus.c:536)
i2cdev_ioctl_smbus (drivers/i2c/i2c-dev.c:391)
i2cdev_ioctl (drivers/i2c/i2c-dev.c:478)
__x64_sys_ioctl (fs/ioctl.c:583)
do_syscall_64 (arch/x86/entry/syscall_64.c:94)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
</TASK>
The bug exists because i2c-stub implements .smbus_xfer directly,
bypassing the I2C_SMBUS_BLOCK_MAX validation in
i2c_smbus_xfer_emulated(). The I2C_SMBUS_BLOCK_DATA case in the same
function correctly validates against I2C_SMBUS_BLOCK_MAX, but the
I2C_SMBUS_I2C_BLOCK_DATA case does not.
Fix by rejecting transfers with data->block[0] == 0 or
data->block[0] > I2C_SMBUS_BLOCK_MAX with -EINVAL, consistent with
both the I2C_SMBUS_BLOCK_DATA case in the same function and the
I2C_SMBUS_I2C_BLOCK_DATA validation in i2c_smbus_xfer_emulated().
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基金会开源的一款操作系统内核。 Linux kernel 2.6.33版本存在缓冲区溢出漏洞，该漏洞源于i2c: stub驱动在处理I2C_SMBUS_I2C_BLOCK_DATA传输时，未对data->block[0]进行有效长度验证，可能导致本地用户通过I2C_SMBUS ioctl进行越界读取或写入，造成栈缓冲区溢出。
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-2026-64191 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-64191 补丁与修复 (6)
同批安全公告 · Linux · 2026-07-20 · 共 9 条
| CVE-2026-64206 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-64188 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-64189 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-64187 | Linux kernel 安全漏洞 | |
| CVE-2026-64190 | Linux kernel 安全漏洞 | |
| CVE-2026-64192 | Linux kernel 安全漏洞 | |
| CVE-2026-64205 | Linux kernel 安全漏洞 | |
| CVE-2026-64207 | Linux kernel 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-64191
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