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 nchannels larger than the command response buffer, the driver may copy excessive amounts of uninitialized memory and potentially crash if nchannels 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).