CVE-2025-68362 (GCVE-0-2025-68362)
Vulnerability from cvelistv5
Published
2025-12-24 10:32
Modified
2025-12-24 10:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb() The rtl8187_rx_cb() calculates the rx descriptor header address by subtracting its size from the skb tail pointer. However, it does not validate if the received packet (skb->len from urb->actual_length) is large enough to contain this header. If a truncated packet is received, this will lead to a buffer underflow, reading memory before the start of the skb data area, and causing a kernel panic. Add length checks for both rtl8187 and rtl8187b descriptor headers before attempting to access them, dropping the packet cleanly if the check fails.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c
Version: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c
Version: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c
Version: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c
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{
  "containers": {
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c"
          ],
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          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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            },
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              "version": "0",
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              "version": "6.19-rc1",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()\n\nThe rtl8187_rx_cb() calculates the rx descriptor header address\nby subtracting its size from the skb tail pointer.\nHowever, it does not validate if the received packet\n(skb-\u003elen from urb-\u003eactual_length) is large enough to contain this\nheader.\n\nIf a truncated packet is received, this will lead to a buffer\nunderflow, reading memory before the start of the skb data area,\nand causing a kernel panic.\n\nAdd length checks for both rtl8187 and rtl8187b descriptor headers\nbefore attempting to access them, dropping the packet cleanly if the\ncheck fails."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T10:32:50.492Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/4758770a673c60d8f615809304d72e1432fa6355"
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          "url": "https://git.kernel.org/stable/c/5ebf0fe7eaef9f6173a4c6ea77c5353e21645d15"
        },
        {
          "url": "https://git.kernel.org/stable/c/b647d2574e4583c2e3b0ab35568f60c88e910840"
        }
      ],
      "title": "wifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68362",
    "datePublished": "2025-12-24T10:32:50.492Z",
    "dateReserved": "2025-12-16T14:48:05.307Z",
    "dateUpdated": "2025-12-24T10:32:50.492Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68362\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T11:15:59.593\",\"lastModified\":\"2025-12-24T11:15:59.593\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()\\n\\nThe rtl8187_rx_cb() calculates the rx descriptor header address\\nby subtracting its size from the skb tail pointer.\\nHowever, it does not validate if the received packet\\n(skb-\u003elen from urb-\u003eactual_length) is large enough to contain this\\nheader.\\n\\nIf a truncated packet is received, this will lead to a buffer\\nunderflow, reading memory before the start of the skb data area,\\nand causing a kernel panic.\\n\\nAdd length checks for both rtl8187 and rtl8187b descriptor headers\\nbefore attempting to access them, dropping the packet cleanly if the\\ncheck fails.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4758770a673c60d8f615809304d72e1432fa6355\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5ebf0fe7eaef9f6173a4c6ea77c5353e21645d15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/638d4148e166d114a4cd7becaae992ce1a815ed8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b647d2574e4583c2e3b0ab35568f60c88e910840\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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