CVE-2026-98238 (GCVE-0-2026-98238)
Vulnerability from cvelistv5
Published
2026-10-06 08:45
Modified
2026-10-19 09:16
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: wwan: t7xx: validate the netif index in t7xx_ccmni_recv_skb() The netif index carried in the DPMAIF PIT header is five bits wide, but ccmni_inst[] only has room for NIC_DEV_MAX (21) entries. t7xx_ccmni_recv_skb() indexes the array without a bounds check, so indexes 21 to 31 read past it. The out-of-bounds value lands in the callback table that follows the array, which is never NULL, so the existing !ccmni check does not catch it and the driver dereferences whatever sits there as a struct t7xx_ccmni. Drop the skb when the index is out of range. Verified in a QEMU guest with a fault injector setting the netif index to 25: the unpatched driver reads a value past ccmni_inst[], which lands in the callback table, and dereferences it far enough to queue the skb. With this check the packet is dropped. Well-formed traffic on index 0 is unaffected. Changes in v2: none.
References
Impacted products
Vendor Product Version
Linux Linux Version: 05d19bf500f8281f574713479b04679fa226d0a3
Version: 05d19bf500f8281f574713479b04679fa226d0a3
Version: 05d19bf500f8281f574713479b04679fa226d0a3
Version: 05d19bf500f8281f574713479b04679fa226d0a3
Version: 05d19bf500f8281f574713479b04679fa226d0a3
Version: 05d19bf500f8281f574713479b04679fa226d0a3
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "drivers/net/wwan/t7xx/t7xx_netdev.c"
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "nodes": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: t7xx: validate the netif index in t7xx_ccmni_recv_skb()\n\nThe netif index carried in the DPMAIF PIT header is five bits wide,\nbut ccmni_inst[] only has room for NIC_DEV_MAX (21) entries.\nt7xx_ccmni_recv_skb() indexes the array without a bounds check, so\nindexes 21 to 31 read past it.  The out-of-bounds value lands in the\ncallback table that follows the array, which is never NULL, so the\nexisting !ccmni check does not catch it and the driver dereferences\nwhatever sits there as a struct t7xx_ccmni.\n\nDrop the skb when the index is out of range.\n\n\nVerified in a QEMU guest with a fault injector setting the netif\nindex to 25: the unpatched driver reads a value past ccmni_inst[],\nwhich lands in the callback table, and dereferences it far enough to\nqueue the skb.  With this check the packet is dropped.  Well-formed\ntraffic on index 0 is unaffected.\n\nChanges in v2: none."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:16:09.924Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7c2fe308bda5a7e6222d7f0c3c311991372baab4"
        },
        {
          "url": "https://git.kernel.org/stable/c/fba45070e25abdae08bcaebfadeef050dc39e208"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1b0609b1a40da03e385be290853a604eb4c3fb9"
        },
        {
          "url": "https://git.kernel.org/stable/c/9dbf13de4edff6fbc1f7ad9c4040326b6ed599ad"
        },
        {
          "url": "https://git.kernel.org/stable/c/d28aa2de9654e8024922775520a2665e00c04ad5"
        },
        {
          "url": "https://git.kernel.org/stable/c/c7ead9704249d57d4693a04697e3bbd285138fa9"
        }
      ],
      "title": "net: wwan: t7xx: validate the netif index in t7xx_ccmni_recv_skb()",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98238",
    "datePublished": "2026-10-06T08:45:09.953Z",
    "dateReserved": "2026-09-25T10:25:14.329Z",
    "dateUpdated": "2026-10-19T09:16:09.924Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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