CVE-2023-53524 wifi: iwlwifi: pcie: Fix integer overflow in iwl_write_to_user_buf
Integer overflow in iwlwifi debugfs handler allows heap overflow, though exploitation requires debugfs access with 0400 privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-53524?
CVE-2023-53524 is a high-severity vulnerability in Linux kernel, published on 1 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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 debugfs operation with 0400 privileges.
Weakness: CWE-190
Which versions are affected by CVE-2023-53524?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-53524?
Apply the vendor's patch.
Is CVE-2023-53524 being exploited?
There is no known exploitation of CVE-2023-53524 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-53524, DEBIAN-CVE-2023-53524, GHSA-pvr4-g739-vh5v, UBUNTU-CVE-2023-53524.