UBUNTU-CVE-2023-52531
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.
02 / AFFECTED SOFTWARE
Affected packages
23 explicit affected versions
35 explicit affected versions
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35 explicit affected versions
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24 explicit affected versions
97 explicit affected versions
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1 explicit affected versions
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10 explicit affected versions
168 explicit affected versions
37 explicit affected versions
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35 explicit affected versions
26 explicit affected versions
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3 explicit affected versions
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29 explicit affected versions
88 explicit affected versions
13 explicit affected versions
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2 explicit affected versions
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23 explicit affected versions
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33 explicit affected versions
10 explicit affected versions
10 explicit affected versions
12 explicit affected versions
87 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
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26 explicit affected versions
27 explicit affected versions
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14 explicit affected versions
38 explicit affected versions
31 explicit affected versions
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31 explicit affected versions
11 explicit affected versions
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38 explicit affected versions
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1 explicit affected versions
1 explicit affected versions
36 explicit affected versions
94 explicit affected versions
13 explicit affected versions
43 explicit affected versions
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125 explicit affected versions
145 explicit affected versions
10 explicit affected versions
8 explicit affected versions
14 explicit affected versions
88 explicit affected versions
4 explicit affected versions
77 explicit affected versions
3 explicit affected versions
1 explicit affected versions
48 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/8ba438ef3cacc4808a63ed0ce24d4f0942cfe55d
- https://ubuntu.com/security/CVE-2023-52531
- https://ubuntu.com/security/notices/USN-7088-1
- https://ubuntu.com/security/notices/USN-7088-2
- https://ubuntu.com/security/notices/USN-7088-3
- https://ubuntu.com/security/notices/USN-7088-4
- https://ubuntu.com/security/notices/USN-7088-5
- https://ubuntu.com/security/notices/USN-7119-1
- https://ubuntu.com/security/notices/USN-7121-1
- https://ubuntu.com/security/notices/USN-7121-2
- https://ubuntu.com/security/notices/USN-7121-3
- https://ubuntu.com/security/notices/USN-7148-1
- https://www.cve.org/CVERecord?id=CVE-2023-52531