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Review reviewHigh

CVE-2022-50131

Linux Linux, linux kernel

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().

CVSS
7.8
EPSS
0.19%
8.47% percentile
CISA KEV
Not listed
Published
2025.06.18
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.19%
Technical severityCVSS 7.8

Vulnerability overview

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 product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 67a95c21463d066060b0f66d65a75d45bb386ffb < 66c8e816f2f2ca4a61b406503bd10bad1b35f72f, >= 67a95c21463d066060b0f66d65a75d45bb386ffb < 91443c669d280937968f0aa4edefa741cfe35314, >= 67a95c21463d066060b0f66d65a75d45bb386ffb < 6402116a7b5ec80fa40fd145a80c813019cd555f, >= 67a95c21463d066060b0f66d65a75d45bb386ffb < 3c0f8a59f2cc8841ee6653399a77f4f3e6e9a270, >= 67a95c21463d066060b0f66d65a75d45bb386ffb < 62ac2473553a00229e67bdf3cb023b62cf7f5a9a, >= 5.7, >= 5.7 < 5.10.137, >= 5.11 < 5.15.61, >= 5.16 < 5.18.18, >= 5.19 < 5.19.2
Fixed versions
5.10.137, 5.15.61, 5.18.18, 5.19.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-787
CVE-2022-50131 — Linux Linux, linux kernel | SECUFOCUS NOW