HIGH
hid I2cHid Overflow
CVE-2026-23178
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
KernelScan AI6.0MEDIUM
01Description
In the Linux kernel, the following vulnerability has been resolved: HID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report() `i2c_hid_xfer` is used to read `recv_len + sizeof(__le16)` bytes of data into `ihid->rawbuf`. The former can come from the userspace in the hidraw driver and is only bounded by HID_MAX_BUFFER_SIZE(16384) by default (unless we also set `max_buffer_size` field of `struct hid_ll_driver` which we do not). The latter has size determined at runtime by the maximum size of different report types you could receive on any particular device and can be a much smaller value. Fix this by truncating `recv_len` to `ihid->bufsize - sizeof(__le16)`. The impact is low since access to hidraw devices requires root.
02KernelScan AI Analysis
Risk summary
Root users with access to I2C HID devices can trigger a heap buffer overflow by providing oversized read lengths through hidraw operations. This can lead to kernel memory corruption or system crashes.
Vulnerability analysis
The vulnerability occurs in i2c_hid_get_report() where a userspace-controlled recv_len parameter is used to read recv_len + sizeof(__le16) bytes into ihid->rawbuf without proper bounds checking. The recv_len can be up to HID_MAX_BUFFER_SIZE (16384) while ihid->bufsize is device-specific and often much smaller. The fix adds a bounds check to truncate recv_len before the I2C transfer. Attack surface is limited to local root users with access to I2C HID hidraw device files.
03Fix Versions
| Branch | Fixed in | Patch commit |
|---|---|---|
| 6.1 | 6.1.163 | f9c9ad89d845 |
| 6.12 | 6.12.70 | 786ec171788b |
| 6.18 | 6.18.10 | 2124279f1f8c |
| 6.6 | 6.6.124 | cff3f619fd1c |
| mainline | 6.19 | 2497ff38c530 |