CVE-2022-3077

A buffer overflow vulnerability was found in the Linux kernel Intel’s iSMT SMBus host controller driver in the way it handled the I2C_SMBUS_BLOCK_PROC_CALL case (via the ioctl I2C_SMBUS) with malicious input data. In particular, the userspace controllable “data->block[0]” variable was not capped to a number between 0-255 and then used as the size of a memcpy, thus possibly writing beyond the end of dma_buffer. This flaw could allow a privileged local user to crash the system.

Mitigation

This flaw can be mitigated by preventing the i2c-ismt module from being loaded. Please see <https://access.redhat.com/solutions/41278&gt; for information on how to blacklist a kernel module to prevent it from being loaded automatically.