CVE-2024-35977

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

platform/chrome: cros_ec_uart: properly fix race condition

The cros_ec_uart_probe() function calls devm_serdev_device_open() before

it calls serdev_device_set_client_ops(). This can trigger a NULL pointer

dereference:

BUG: kernel NULL pointer dereference, address: 0000000000000000

...

Call Trace:

<TASK>

...

? ttyport_receive_buf

A simplified version of crashing code is as follows:

static inline size_t serdev_controller_receive_buf(struct serdev_controller *ctrl,

const u8 *data,

size_t count)

{

struct serdev_device *serdev = ctrl->serdev;

if (!serdev || !serdev->ops->receive_buf) // CRASH!

return 0;

return serdev->ops->receive_buf(serdev, data, count);

}

It assumes that if SERPORT_ACTIVE is set and serdev exists, ser

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References