CVE-2023-2194

What it actually does

Out-of-bounds write in the Linux kernel SLIMpro I2C driver where an uncapped userspace data->block[0] value controls memcpy size into dma_buffer, enabling memory corruption.

Why it matters to the business

Local privileged users on affected Linux systems can crash the kernel or potentially execute arbitrary code, leading to denial of service or full host compromise; widespread kernel updates required across servers and embedded devices.

How an attack unfolds

A local user with root privileges supplies an oversized value in data->block[0] via the SLIMpro I2C interface, bypassing size validation and causing memcpy to write past the end of dma_buffer, resulting in memory corruption that may be leveraged for code execution.

How to fix it

Upgrade the Linux kernel to a version containing commit 457391b0380335d5e9a5babdec90ac53928b23b4 or later; rebuild and deploy updated kernels across all affected systems.

How to confirm the fix worked

Verify kernel source or binary contains commit 457391b0380335d5e9a5babdec90ac53928b23b4; test driver functionality post-upgrade and confirm absence of the vulnerable memcpy path via code review or fuzzing.

Typical attack path

1. Gain local root or high-privileged access on target system
2. Locate and interact with the SLIMpro I2C device driver interface
3. Craft and submit malicious data->block[0] value exceeding 255
4. Trigger oversized memcpy into dma_buffer
5. Exploit resulting memory corruption for crash or code execution

How to detect it

Review kernel logs for I2C or SLIMpro related oops/panics, inspect audit logs for unusual access to I2C device nodes, and search system call traces involving the affected driver.

What your security team should do

• Immediately schedule kernel upgrades to the fixed commit on all production systems
• Restrict untrusted local access until patches are applied
• Monitor for kernel oops or panics related to I2C drivers
• Audit custom or downstream kernel builds for inclusion of the fix