CVE-2023-52531

Technical Description

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

wifi: iwlwifi: mvm: Fix a memory corruption issue

A few lines above, space is kzalloc()'ed for:

sizeof(struct iwl_nvm_data) +

sizeof(struct ieee80211_channel) +

sizeof(struct ieee80211_rate)

'mvm->nvm_data' is a 'struct iwl_nvm_data', so it is fine.

At the end of this structure, there is the 'channels' flex array.

Each element is of type 'struct ieee80211_channel'.

So only 1 element is allocated in this array.

When doing:

mvm->nvm_data->bands[0].channels = mvm->nvm_data->channels;

We point at the first element of the 'channels' flex array.

So this is fine.

However, when doing:

mvm->nvm_data->bands[0].bitrates =

(void *)((u8 *)mvm->nvm_data->channels + 1);

because of the "(u8 *)" cast, we add only 1 to the address of the beginning

of the flex array.

It is likely that we want point at the 'struct ieee80211_rate' allocated

just after.

Remove the spurious casting so that the pointer arithmetic works as

ex

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References