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CVE-2026-23448 (GCVE-0-2026-23448)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-05-11 22:07
VLAI
Title
net: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check
Summary
In the Linux kernel, the following vulnerability has been resolved: net: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check cdc_ncm_rx_verify_ndp16() validates that the NDP header and its DPE entries fit within the skb. The first check correctly accounts for ndpoffset: if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) but the second check omits it: if ((sizeof(struct usb_cdc_ncm_ndp16) + ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) This validates the DPE array size against the total skb length as if the NDP were at offset 0, rather than at ndpoffset. When the NDP is placed near the end of the NTB (large wNdpIndex), the DPE entries can extend past the skb data buffer even though the check passes. cdc_ncm_rx_fixup() then reads out-of-bounds memory when iterating the DPE array. Add ndpoffset to the nframes bounds check and use struct_size_t() to express the NDP-plus-DPE-array size more clearly.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 , < f1c7701d3ac91b62d672c13690cf295821f0d5c3 (git)
Affected: ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 , < 789204f980730258c983102c027c375238009c80 (git)
Affected: ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 , < 403f94ddcb36c552fbef51dea735b131e3dcde8b (git)
Affected: ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 , < dce9dda0e3707e887977db44407989e9ead26611 (git)
Affected: ff06ab13a4ccae4acb44a2d4e3ece367b616ab50 , < 2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check\n\ncdc_ncm_rx_verify_ndp16() validates that the NDP header and its DPE\nentries fit within the skb. The first check correctly accounts for\nndpoffset:\n\n  if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) \u003e skb_in-\u003elen)\n\nbut the second check omits it:\n\n  if ((sizeof(struct usb_cdc_ncm_ndp16) +\n       ret * (sizeof(struct usb_cdc_ncm_dpe16))) \u003e skb_in-\u003elen)\n\nThis validates the DPE array size against the total skb length as if\nthe NDP were at offset 0, rather than at ndpoffset. When the NDP is\nplaced near the end of the NTB (large wNdpIndex), the DPE entries can\nextend past the skb data buffer even though the check passes.\ncdc_ncm_rx_fixup() then reads out-of-bounds memory when iterating\nthe DPE array.\n\nAdd ndpoffset to the nframes bounds check and use struct_size_t() to\nexpress the NDP-plus-DPE-array size more clearly."
        }
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          "url": "https://git.kernel.org/stable/c/2aa8a4fa8d5b7d0e1ebcec100e1a4d80a1f4b21a"
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      ],
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When the NDP is\\nplaced near the end of the NTB (large wNdpIndex), the DPE entries can\\nextend past the skb data buffer even though the check passes.\\ncdc_ncm_rx_fixup() then reads out-of-bounds memory when iterating\\nthe DPE array.\\n\\nAdd ndpoffset to the nframes bounds check and use struct_size_t() to\\nexpress the NDP-plus-DPE-array size more clearly.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnet: usb: cdc_ncm: a\u00f1adir ndpoffset a la comprobaci\u00f3n de l\u00edmites de nframes de NDP16\\n\\ncdc_ncm_rx_verify_ndp16() valida que la cabecera NDP y sus entradas DPE encajan dentro del skb. La primera comprobaci\u00f3n tiene en cuenta correctamente ndpoffset:\\n\\nif ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) \u003e skb_in -\u003e len)\\n\\npero la segunda comprobaci\u00f3n lo omite:\\n\\nif ((sizeof(struct usb_cdc_ncm_ndp16) + ret * (sizeof(struct usb_cdc_ncm_dpe16))) \u003e skb_in -\u003e len)\\n\\nEsto valida el tama\u00f1o del array DPE contra la longitud total del skb como si el NDP estuviera en el offset 0, en lugar de en ndpoffset. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:21:04+00:00",
      "cve": "CVE-2026-23448",
      "id": "CVE-2026-23448",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23448.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T13:43:53Z",
      "cve": "CVE-2026-23448",
      "id": "CVE-2026-23448",
      "initial_release_date": "2026-04-03T23:27:35Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "661",
      "product_status:known_not_affected": "12",
      "product_status:recommended": "317",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23448",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23448.json",
      "version": "16"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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