{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b"
            },
            {
              "fixed": "fb25c76a820ca8a547aa478bfb503da0a11494ab"
            },
            {
              "fixed": "d9d021218162b6c4fe0bdf42b2b340f1aae23a12"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53170.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/ethosu: reject DMA commands with uninitialized length\n\ncmd_state_init() initializes the command state with memset(0xff),\nleaving dma-\u003elen at U64_MAX to signal missing setup. The only setter\nis NPU_SET_DMA0_LEN; if userspace omits this command and issues\nNPU_OP_DMA_START, dma-\u003elen remains U64_MAX.\n\nIn dma_length(), a positive stride added to U64_MAX wraps to a small\nvalue. With size0 == 1, check_mul_overflow() does not trigger and\ndma_length() returns 0 instead of U64_MAX. The caller's U64_MAX check\nthen passes, region_size[] stays 0, and the bounds check in\nethosu_job.c is bypassed, allowing hardware to execute DMA with stale\nphysical addresses.\n\nFix by checking for U64_MAX at the start of dma_length() before any\narithmetic, consistent with the sentinel value used throughout the\ndriver to detect uninitialized fields.",
  "id": "CVE-2026-53170",
  "modified": "2026-07-08T05:38:48.457228925Z",
  "published": "2026-06-25T08:38:48.728Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d9d021218162b6c4fe0bdf42b2b340f1aae23a12"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb25c76a820ca8a547aa478bfb503da0a11494ab"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53170.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53170"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "accel/ethosu: reject DMA commands with uninitialized length"
}