CVE-2023-53493

/// Technical description

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

accel/qaic: tighten bounds checking in decode_message()

Copy the bounds checking from encode_message() to decode_message().

This patch addresses the following concerns. Ensure that there is

enough space for at least one header so that we don't have a negative

size later.

if (msg_hdr_len < sizeof(*trans_hdr))

Ensure that we have enough space to read the next header from the

msg->data.

if (msg_len > msg_hdr_len - sizeof(*trans_hdr))

return -EINVAL;

Check that the trans_hdr->len is not below the minimum size:

if (hdr_len < sizeof(*trans_hdr))

This minimum check ensures that we don't corrupt memory in

decode_passthrough() when we do.

memcpy(out_trans->data, in_trans->data, len - sizeof(in_trans->hdr));

And finally, use size_add() to prevent an integer overflow:

if (size_add(msg_len, hdr_len) > msg_hdr_len)

/// 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