CVE-2026-31623 (GCVE-0-2026-31623)
Vulnerability from cvelistv5
Published
2026-04-24 14:42
Modified
2026-04-27 13:57
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete() A malicious USB device claiming to be a CDC Phonet modem can overflow the skb_shared_info->frags[] array by sending an unbounded sequence of full-page bulk transfers. Drop the skb and increment the length error when the frag limit is reached. This matches the same fix that commit f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path") did for the t7xx driver.
References
Impacted products
Vendor Product Version
Linux Linux Version: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782
Version: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782
Version: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782
Version: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782
Version: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782
Version: 87cf65601e1709e57f7e28f0f7b3eb0a992c1782
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/usb/cdc-phonet.c"
          ],
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          ],
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              "version": "0",
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              "status": "unaffected",
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              "version": "7.1-rc1",
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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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\nnet: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()\n\nA malicious USB device claiming to be a CDC Phonet modem can overflow\nthe skb_shared_info-\u003efrags[] array by sending an unbounded sequence of\nfull-page bulk transfers.\n\nDrop the skb and increment the length error when the frag limit is\nreached.  This matches the same fix that commit f0813bcd2d9d (\"net:\nwwan: t7xx: fix potential skb-\u003efrags overflow in RX path\") did for the\nt7xx driver."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-27T13:57:02.737Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d4e1946bea8d6441835eb3fd09b19237ba366a6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/a23b1b1aaf41e174181d5853a70e65d4d01e648c"
        },
        {
          "url": "https://git.kernel.org/stable/c/c183d5775129a0a7495bd61a6e57ec230dcf01e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/ebf75c6301c4972a87542ebf2d994c6391eb5d46"
        },
        {
          "url": "https://git.kernel.org/stable/c/9989938d13cc5ba8447eeed5a61acfcf61bc6801"
        },
        {
          "url": "https://git.kernel.org/stable/c/600dc40554dc5ad1e6f3af51f700228033f43ea7"
        }
      ],
      "title": "net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31623",
    "datePublished": "2026-04-24T14:42:40.566Z",
    "dateReserved": "2026-03-09T15:48:24.124Z",
    "dateUpdated": "2026-04-27T13:57:02.737Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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