Bug 2373502 (CVE-2022-50131)

Summary: CVE-2022-50131 kernel: HID: mcp2221: prevent a buffer overflow in mcp_smbus_write()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A buffer overflow vulnerability has been found in the linux kernel, such that when calling mcp_smbus_write(), a buffer of a smaller size is called when performing memcpy, resulting in damage to confidentiality, integrity, and availability of the system.
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Description OSIDB Bzimport 2025-06-18 12:05:49 UTC 
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().
Comment 1 Avinash Hanwate 2025-06-19 21:26:06 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025061815-CVE-2022-50131-4df3@gregkh/T