{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64304",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64304"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "crypto: qat - validate RSA CRT component lengths",
  "details": "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64304"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6d99c5fadd2df488103f64d6475b63ba6852202b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c34369473bfe92a0b46ec78d6358e30341c7f481"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1002719d13072a5e4be1e993aa61dffb4a604e82"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/500319830d76911c120dc0b9605f8c16d7702844"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3d61a214fdcda41f1ebfabbb483404032a7b4d91"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ce42224487c504aee4b7ff3a7342e7b4d7e28cc9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b3ac78756588059729b9195fcc9f4b37d54057a5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - An unprivileged local process can add a crafted PKCS#8 RSA private key to its own keyring and invoke KEYCTL_PKEY_QUERY, which selects qat-rsa and reaches the vulnerable key setup path.\nAC:L - With an active QAT asymmetric service and PKCS#8 parser, an oversized CRT integer deterministically causes unsigned offset underflow and an out-of-bounds memcpy. No race or attacker-uncontrollable condition is required.\nPR:L - An ordinary user can create, search, and use keys in a personal process, thread, or session keyring. No capability, administrator privilege, or user namespace is required.\nUI:N - The attacker directly performs the add_key and keyctl system calls without any victim action.\nS:U - The vulnerable QAT driver and the corrupted kernel resources share the same security authority. Ordinary kernel privilege escalation does not cross a CVSS scope boundary.\nC:H - The controlled kernel-memory overwrite can corrupt page tables, credentials, or control-flow objects and plausibly yield code execution with access to protected kernel memory.\nI:H - Attacker-controlled CRT bytes are written outside the coherent DMA allocation, potentially through multiple CRT components. This can provide powerful kernel-memory corruption and control-flow hijacking primitives.\nA:H - The invalid destination can cause an immediate kernel fault or corrupt unrelated kernel memory and subsequently panic or hang the system. The attack is repeatable."
    }
  }
}