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crypto: qat - validate RSA CRT component lengths

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.261, 5.15.212, 6.1.178, 6.12.96, 6.18.39, 6.6.145, 7.1.4
CVEs
CVE-2026-64304
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 23:08 UTC · Revision 1

Source evidence

crypto: qat - validate RSA CRT component lengths

core-osv · Original source

Published 25 Jul 2026, 08:49 UTC

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.

osv:CVE-2026-64304

Kernel

Fixed versions: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4

Complete source record
{
  "id": "45eb177b06a15e63dc585d8156e146cad0f9974d2dbf5ef0df3925eeed4c88bb",
  "url": "https://osv.dev/vulnerability/CVE-2026-64304",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "crypto: qat - validate RSA CRT component lengths",
    "summary": "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.",
    "evidence": "osv:CVE-2026-64304",
    "products": [
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          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
          },
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            "evidence": "/affected/1/ranges"
          },
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            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "high",
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      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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                  "introduced": "4.8.0"
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      ],
      "modified": "2026-10-28T02:30:24.209796540Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1002719d13072a5e4be1e993aa61dffb4a604e82",
        "https://git.kernel.org/stable/c/3d61a214fdcda41f1ebfabbb483404032a7b4d91",
        "https://git.kernel.org/stable/c/500319830d76911c120dc0b9605f8c16d7702844",
        "https://git.kernel.org/stable/c/6d99c5fadd2df488103f64d6475b63ba6852202b",
        "https://git.kernel.org/stable/c/6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a",
        "https://git.kernel.org/stable/c/b3ac78756588059729b9195fcc9f4b37d54057a5",
        "https://git.kernel.org/stable/c/c34369473bfe92a0b46ec78d6358e30341c7f481",
        "https://git.kernel.org/stable/c/ce42224487c504aee4b7ff3a7342e7b4d7e28cc9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64304.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64304",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64304.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64304",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490756,
  "published_at": "2026-07-25T08:49:38.873+00:00"
}