CVE-2025-38657 (GCVE-0-2025-38657)
Vulnerability from cvelistv5
Published
2025-08-22 16:01
Modified
2025-08-22 16:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: rtw89: mcc: prevent shift wrapping in rtw89_core_mlsr_switch() The "link_id" value comes from the user via debugfs. If it's larger than BITS_PER_LONG then that would result in shift wrapping and potentially an out of bounds access later. In fact, we can limit it to IEEE80211_MLD_MAX_NUM_LINKS (15). Fortunately, only root can write to debugfs files so the security impact is minimal.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/417cfa9cc44fbe6bceab786f9a4ee5a210f1288e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53cf488927a0f79968f9c03c4d1e00d2a79731c3
Impacted products
Vendor Product Version
Linux Linux Version: 9dd85e739ce0765f022014c3e0713e1007d7ef60
Version: 9dd85e739ce0765f022014c3e0713e1007d7ef60
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   Linux Linux Version: 6.16
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/realtek/rtw89/core.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw89: mcc: prevent shift wrapping in rtw89_core_mlsr_switch()\n\nThe \"link_id\" value comes from the user via debugfs.  If it\u0027s larger\nthan BITS_PER_LONG then that would result in shift wrapping and\npotentially an out of bounds access later.  In fact, we can limit it\nto IEEE80211_MLD_MAX_NUM_LINKS (15).\n\nFortunately, only root can write to debugfs files so the security\nimpact is minimal."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-22T16:01:00.512Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "wifi: rtw89: mcc: prevent shift wrapping in rtw89_core_mlsr_switch()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38657",
    "datePublished": "2025-08-22T16:01:00.512Z",
    "dateReserved": "2025-04-16T04:51:24.030Z",
    "dateUpdated": "2025-08-22T16:01:00.512Z",
    "state": "PUBLISHED"
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  }
}


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