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CVE-2026-64304

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: qat - validate RSA CRT component lengths The generic RSA key parser (rsa_helper.c) bounds each CRT component (p, q, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt() allocates half-size DMA buffers (key_sz / 2) and right-aligns each component with: memcpy(dst + half_key_sz - len, src, len) When a CRT component is larger than half_key_sz the subtraction underflows and memcpy writes past the DMA buffer, causing memory corruption. Add a len > half_key_sz check next to the existing !len check for each of the five CRT components so the driver falls back to the non-CRT path instead of writing out of bounds.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-07-25 10:17:11.403000
Last modified
2026-10-24 13:10:00.147000
View original CVE JSON 
{
  "id": "CVE-2026-64304",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-07-25T10:17:11.403",
  "lastModified": "2026-10-24T13:10:00.147",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: qat - validate RSA CRT component lengths\n\nThe generic RSA key parser (rsa_helper.c) bounds each CRT component (p,\nq, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt()\nallocates half-size DMA buffers (key_sz / 2) and right-aligns each\ncomponent with:\n\n    memcpy(dst + half_key_sz - len, src, len)\n\nWhen a CRT component is larger than half_key_sz the subtraction\nunderflows and memcpy writes past the DMA buffer, causing memory\ncorruption.\n\nAdd a len > half_key_sz check next to the existing !len check for each\nof the five CRT components so the driver falls back to the non-CRT path\ninstead of writing out of bounds."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: qat - validar las longitudes de los componentes RSA CRT\n\nEl analizador genérico de claves RSA (rsa_helper.c) limita cada componente CRT (p, q, dp, dq, qinv) por el tamaño del módulo n_sz, pero qat_rsa_setkey_crt() asigna búferes DMA de tamaño medio (key_sz / 2) y alinea a la derecha cada componente con:\n\n    memcpy(dst + half_key_sz - len, src, len)\n\nCuando un componente CRT es mayor que half_key_sz, la resta subdesborda y memcpy escribe más allá del búfer DMA, causando corrupción de memoria.\n\nAñadir una comprobación len > half_key_sz junto a la comprobación !len existente para cada uno de los cinco componentes CRT para que el controlador recurra a la ruta no-CRT en lugar de escribir fuera de los límites."
    }
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              "versionType": "original_commit_for_fix",
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          "baseScore": 7.8,
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          "scope": "UNCHANGED",
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          "role": "CISA Coordinator",
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