CVE-2025-39891 (GCVE-0-2025-39891)

Vulnerability from cvelistv5 – Published: 2025-10-01 07:42 – Updated: 2025-11-03 17:44
VLAI?
Title
wifi: mwifiex: Initialize the chan_stats array to zero
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: Initialize the chan_stats array to zero The adapter->chan_stats[] array is initialized in mwifiex_init_channel_scan_gap() with vmalloc(), which doesn't zero out memory. The array is filled in mwifiex_update_chan_statistics() and then the user can query the data in mwifiex_cfg80211_dump_survey(). There are two potential issues here. What if the user calls mwifiex_cfg80211_dump_survey() before the data has been filled in. Also the mwifiex_update_chan_statistics() function doesn't necessarily initialize the whole array. Since the array was not initialized at the start that could result in an information leak. Also this array is pretty small. It's a maximum of 900 bytes so it's more appropriate to use kcalloc() instead vmalloc().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bf35443314acb43fa8a3f9f8046e14cbe178762b , < 9eb0118b3470b4d2e4e3bbb1fc088b30c0285d65 (git)
Affected: bf35443314acb43fa8a3f9f8046e14cbe178762b , < 05daef0442d28350a1a0d6d0e2cab4a7a91df475 (git)
Affected: bf35443314acb43fa8a3f9f8046e14cbe178762b , < acdf26a912190fc6746e2a890d7d0338190527b4 (git)
Affected: bf35443314acb43fa8a3f9f8046e14cbe178762b , < 32c124c9c03aa755cbaf60ef7f76afd918d47659 (git)
Affected: bf35443314acb43fa8a3f9f8046e14cbe178762b , < 9df29aa5637d94d24f7c5f054ef4feaa7b766111 (git)
Affected: bf35443314acb43fa8a3f9f8046e14cbe178762b , < 06616410a3e5e6cd1de5b7cbc668f1a7edeedad9 (git)
Affected: bf35443314acb43fa8a3f9f8046e14cbe178762b , < 5285b7009dc1e09d5bb9e05fae82e1a807882dbc (git)
Affected: bf35443314acb43fa8a3f9f8046e14cbe178762b , < 0e20450829ca3c1dbc2db536391537c57a40fe0b (git)
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    Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (semver)
Unaffected: 5.4.299 , ≤ 5.4.* (semver)
Unaffected: 5.10.243 , ≤ 5.10.* (semver)
Unaffected: 5.15.192 , ≤ 5.15.* (semver)
Unaffected: 6.1.151 , ≤ 6.1.* (semver)
Unaffected: 6.6.105 , ≤ 6.6.* (semver)
Unaffected: 6.12.46 , ≤ 6.12.* (semver)
Unaffected: 6.16.6 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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      "descriptions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mwifiex: Initialize the chan_stats array to zero\n\nThe adapter-\u003echan_stats[] array is initialized in\nmwifiex_init_channel_scan_gap() with vmalloc(), which doesn\u0027t zero out\nmemory.  The array is filled in mwifiex_update_chan_statistics()\nand then the user can query the data in mwifiex_cfg80211_dump_survey().\n\nThere are two potential issues here.  What if the user calls\nmwifiex_cfg80211_dump_survey() before the data has been filled in.\nAlso the mwifiex_update_chan_statistics() function doesn\u0027t necessarily\ninitialize the whole array.  Since the array was not initialized at\nthe start that could result in an information leak.\n\nAlso this array is pretty small.  It\u0027s a maximum of 900 bytes so it\u0027s\nmore appropriate to use kcalloc() instead vmalloc()."
        }
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          "url": "https://git.kernel.org/stable/c/05daef0442d28350a1a0d6d0e2cab4a7a91df475"
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        {
          "url": "https://git.kernel.org/stable/c/0e20450829ca3c1dbc2db536391537c57a40fe0b"
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      "title": "wifi: mwifiex: Initialize the chan_stats array to zero",
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    "dateReserved": "2025-04-16T07:20:57.145Z",
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    "state": "PUBLISHED"
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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