What’s Vulnerable › Vulnerabilities

CVE-2022-50131: HID: mcp2221: prevent a buffer overflow in mcp_smbus_write()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-18 · updated 2026-08-04
• Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: prevent a buffer overflow in mcp_smbus_write() Smatch Warning: drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() '&mcp->txbuf[5]' too small (59 vs 255) drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() 'buf' too small (34 vs 255) The 'len' variable can take a value between 0-255 as it can come from data->block[0] and it is user data. So add an bound check to prevent a buffer overflow in memcpy().

Affected products

• Linux kernel: from 5.7 before 5.10.137; from 5.11 before 5.15.61; from 5.16 before 5.18.18; from 5.19 before 5.19.2 — fixed in 5.10.137, 5.15.61, 5.18.18, 5.19.2

How to fix

Upgrade to a fixed version: Linux kernel 5.10.137, 5.15.61, 5.18.18, 5.19.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3c0f8a59f2cc8841ee6653399a77f4f3e6e9a270
• https://git.kernel.org/stable/c/62ac2473553a00229e67bdf3cb023b62cf7f5a9a
• https://git.kernel.org/stable/c/6402116a7b5ec80fa40fd145a80c813019cd555f
• https://git.kernel.org/stable/c/66c8e816f2f2ca4a61b406503bd10bad1b35f72f
• https://git.kernel.org/stable/c/91443c669d280937968f0aa4edefa741cfe35314

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