CVE-2023-53524: 
Linux Kernel vulnerability analysis and mitigation

An integer overflow vulnerability was discovered in the Linux kernel's iwlwifi driver, specifically in the iwlwritetouserbuf() function which is called by iwldbgfsmonitordataread(). The vulnerability was disclosed on October 1, 2025 (NVD, RedHat).

The vulnerability occurs when a SIZEMAX value is passed to the 'ssizet count' parameter in the iwlwritetouserbuf() function. This value is assigned to 'int bufsizeleft', which is then compared with 'size'. Since 'bufsizeleft' becomes a negative number, 'size' is assigned this negative value and is passed as the third argument to the copytouser function, potentially causing a heap overflow. The vulnerability has been assigned a CVSS v3.1 base score of 5.5 (RedHat).

While this vulnerability could potentially lead to a heap overflow condition, its actual impact is limited because the affected function iwldbgfsmonitordataread() is a debugfs operation with 0400 privileges, which significantly restricts its accessibility (NVD).

The vulnerability has been patched in the Linux kernel with a fix titled 'wifi: iwlwifi: pcie: Fix integer overflow in iwlwritetouserbuf'. Various Linux distributions have either implemented the fix or marked it for deferred fixing (RedHat).