CVE-2022-50131

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux67a95c21463d066060b0f66d65a75d45bb386ffb < 66c8e816f2f2ca4a61b406503bd10bad1b35f72faffected
LinuxLinux67a95c21463d066060b0f66d65a75d45bb386ffb < 91443c669d280937968f0aa4edefa741cfe35314affected
LinuxLinux67a95c21463d066060b0f66d65a75d45bb386ffb < 6402116a7b5ec80fa40fd145a80c813019cd555faffected
LinuxLinux67a95c21463d066060b0f66d65a75d45bb386ffb < 3c0f8a59f2cc8841ee6653399a77f4f3e6e9a270affected
LinuxLinux67a95c21463d066060b0f66d65a75d45bb386ffb < 62ac2473553a00229e67bdf3cb023b62cf7f5a9aaffected
LinuxLinux5.7affected
LinuxLinux0 < 5.7unaffected
LinuxLinux5.10.137 <= 5.10.*unaffected
LinuxLinux5.15.61 <= 5.15.*unaffected
LinuxLinux5.18.18 <= 5.18.*unaffected
LinuxLinux5.19.2 <= 5.19.*unaffected
LinuxLinux6.0 <= *unaffected

Weaknesses

References