CVE-2023-53589: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-53589 affects the Linux kernel's iwlwifi MVM driver. The vulnerability was disclosed on October 4, 2025, and involves a buffer overflow issue where the driver incorrectly trusts firmware-reported n_channels in the MCC response, potentially leading to out-of-bounds memory operations (NVD, RedHat).

The vulnerability exists in the iwlwifi MVM driver's handling of firmware MCC responses. When the firmware sends a corrupted MCC response with n_channels larger than the command response buffer, the driver may copy excessive amounts of uninitialized memory and potentially crash if n_channels is large enough to exceed the one-page allocation for the firmware response. The issue has been assigned a CVSS v3.1 score of 4.6 (AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) and is classified under CWE-131 (RedHat).

The vulnerability can lead to out-of-bounds reads and potential kernel crashes. However, exploitation requires physical access or a compromised NIC firmware, as it operates within the physical/firmware threat model rather than through ordinary network input (RedHat).

The vulnerability has been fixed by implementing proper length validation checks for the firmware-reported n_channels value in the MCC response. While a simple < comparison would be sufficient, the fix implements stricter checking to ensure the firmware behaves correctly (NVD).