UnratedFix available

net: wwan: t7xx: validate the netif index in t7xx_ccmni_recv_skb()

Type: advisorySources: OSV

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.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.1.189, 6.12.112, 6.18.54, 6.6.158, 7.2.8
CVEs: CVE-2026-98238
Confirmed fixed CVEs: Not specified
Updated in this feed: 4 Nov 2026, 02:28 UTC · Revision 1

Source evidence

net: wwan: t7xx: validate the netif index in t7xx_ccmni_recv_skb()

core-osv · Original source

Published 6 Oct 2026, 08:45 UTC

osv:CVE-2026-98238

Kernel

Fixed versions: 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8

Complete source record

{
  "id": "2dd6d12f97513bac533b03547bde97a9747e46a36e6448a3a8833ea1c479c06c",
  "url": "https://osv.dev/vulnerability/CVE-2026-98238",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: wwan: t7xx: validate the netif index in t7xx_ccmni_recv_skb()",
    "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.",
    "evidence": "osv:CVE-2026-98238",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.1.189",
            "evidence": "/affected/1/ranges"
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    "severity": "unknown",
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      "aliases": [
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:32.478340423Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/7c2fe308bda5a7e6222d7f0c3c311991372baab4",
        "https://git.kernel.org/stable/c/9dbf13de4edff6fbc1f7ad9c4040326b6ed599ad",
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      "provider_metadata": {
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      }
    },
    "related_cves": [
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        "value": "CVE-2026-98238",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 499689,
  "published_at": "2026-10-06T08:45:09.953+00:00"
}