# CVE-2023-52531: linux: In the Linux kernel, the following vulnerability has been resolved:  wifi: iwlwifi: mvm: Fix a memory corruption issu...

CVE-2023-52531 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52531, released March 2, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-52531
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 2, 2024

## 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 expected.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.64-1 | [DEBIAN-CVE-2023-52531](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52531.md) | Mar 2, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.5.8-1 | [DEBIAN-CVE-2023-52531](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52531.md) | Mar 2, 2024 |
| Linux | linux Debian 14 | 6.5.8-1 | [DEBIAN-CVE-2023-52531](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52531.md) | Mar 2, 2024 |

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