CVE-2023-53524

/// Technical description

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

wifi: iwlwifi: pcie: Fix integer overflow in iwl_write_to_user_buf

An integer overflow occurs in the iwl_write_to_user_buf() function,

which is called by the iwl_dbgfs_monitor_data_read() function.

static bool iwl_write_to_user_buf(char __user *user_buf, ssize_t count,

void *buf, ssize_t *size,

ssize_t *bytes_copied)

{

int buf_size_left = count - *bytes_copied;

buf_size_left = buf_size_left - (buf_size_left % sizeof(u32));

if (*size > buf_size_left)

*size = buf_size_left;

If the user passes a SIZE_MAX value to the "ssize_t count" parameter,

the ssize_t count parameter is assigned to "int buf_size_left".

Then compare "*size" with "buf_size_left" . Here, "buf_size_left" is a

negative number, so "*size" is assigned "buf_size_left" and goes into

the third argument of the copy_to_user function, causing a heap overflow.

This is not a security vulnerability because iwl_dbgfs_monitor_data_read()

is a deb

/// 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