{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53159",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53159"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "misc: fastrpc: fix DMA address corruption due to find_vma misuse",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: fix DMA address corruption due to find_vma misuse\n\nfastrpc_get_args() uses find_vma() to look up the VMA for a user-provided\npointer and compute a DMA address offset. When the address falls in a gap\nbefore the returned VMA, (ptr & PAGE_MASK) - vma->vm_start underflows,\ncorrupting the DMA address sent to the DSP.\n\nReplace find_vma() with vma_lookup(), which returns NULL when the address\nis not contained within any VMA.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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": "6.1.176",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53159"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d43afc412d439ffca1567e7ca8652be22f272b3b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2d0f47e27c1fa718b29c69aa7c96a2c5161bc2c2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/708c17b52c60fe7a57e73b495bdee50f58feb48c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d3e26df2e8eb361e6bef096b2fd565476a1f14c4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e69e306a4cccb40a73511350cb280825a556ce3c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/53e06f8a3c2b085c31bf1284e2ebcb8036e99625"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7ba7b30ddb04646d4d638f4d8c4718a304bbbddd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/464c6ad2aa16e1e1df9d559289199356493d1e00"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is reached through local FastRPC misc-device ioctls, especially FASTRPC_IOCTL_INVOKE, not through network packets or adjacent/physical input.\nAC:L - The attacker controls the invoke arguments, DMA-buf fd, length, and user address layout; placing the pointer in a VMA gap is straightforward with mmap/munmap and no race is required.\nPR:L - A caller needs local access to an openable /dev/fastrpc-* device, but the kernel path has no capable() check and FastRPC supports untrusted/unsigned user protection domains on relevant Qualcomm DSP deployments.\nUI:N - The attacker triggers the ioctl path directly and does not need another user to open files, mount anything, or perform an action.\nS:C - The corrupted address is consumed across the host/DSP DMA/IOMMU boundary, so the bug can affect memory resources outside the caller\u2019s intended FastRPC buffer authority.\nC:H - The underflow can make an attacker-controlled DSP invocation read from unintended DMA/IOMMU-visible memory rather than the supplied buffer, which is a plausible high-impact information disclosure primitive.\nI:H - For output or bidirectional buffers, the same corrupted DMA address can direct DSP writes to unintended DMA/IOMMU-visible memory, giving a plausible high-impact memory corruption primitive.\nA:H - Invalid or unintended DMA addresses can trigger IOMMU/DSP faults, hangs, or kernel-facing subsystem failure, producing high availability impact."
    }
  }
}