CVE-2026-68368
Estado: RecibidaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()
When unpacking host-supplied NTBs, ncm_unwrap_ntb() checks datagram length against frame_max but does not verify that the datagram fits within the declared block length. Additionally, when decoding multiple NTBs from a single socket buffer, subsequent block lengths are not checked against the actual remaining buffer data.
With these checks missing, a malicious USB host can specify datagram offsets and lengths that point beyond the block, or supply secondary NTB headers declaring lengths larger than the buffer. skb_put_data() then copies adjacent kernel memory from skb_shared_info into the network skb.
Leer descripción completaMostrar menos
Fix this by verifying that sufficient buffer space remains for the NTB header before parsing, handling zero-length block declarations, ensuring that block lengths never exceed the remaining buffer space, and verifying that each datagram payload stays strictly within the block boundary.
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.22%
- Percentil entre todas las CVEs puntuadas: 11
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/1febec7e47cdcd01f43fb0211094e3010474666e
- https://git.kernel.org/stable/c/35d15bbaec0557330e774ec31412ef508de6e0e0
- https://git.kernel.org/stable/c/40c706a0224bde194667e3378c689b542fec4b44
- https://git.kernel.org/stable/c/41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c
- https://git.kernel.org/stable/c/6b2be489eaa6293e60549005d91f15ceb150510f
- https://git.kernel.org/stable/c/e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f
- https://git.kernel.org/stable/c/f87ed889f0f7417b8938c98d8833f559b755373c
- https://git.kernel.org/stable/c/fff1059d139ef798bab917990524faaf25854ca8
JSON original (NVD)
Mostrar
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"id": "CVE-2026-68368",
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{
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"published": "2026-08-10T13:20:29.503",
"references": [
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"url": "https://git.kernel.org/stable/c/1febec7e47cdcd01f43fb0211094e3010474666e",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()\n\nWhen unpacking host-supplied NTBs, ncm_unwrap_ntb() checks datagram length\nagainst frame_max but does not verify that the datagram fits within the\ndeclared block length. Additionally, when decoding multiple NTBs from a\nsingle socket buffer, subsequent block lengths are not checked against the\nactual remaining buffer data.\n\nWith these checks missing, a malicious USB host can specify datagram\noffsets and lengths that point beyond the block, or supply secondary NTB\nheaders declaring lengths larger than the buffer. skb_put_data() then\ncopies adjacent kernel memory from skb_shared_info into the network skb.\n\nFix this by verifying that sufficient buffer space remains for the NTB\nheader before parsing, handling zero-length block declarations, ensuring\nthat block lengths never exceed the remaining buffer space, and verifying\nthat each datagram payload stays strictly within the block boundary."
}
],
"lastModified": "2026-08-19T17:20:46.323",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}