{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68449",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-68449"
  ],
  "published": "2026-08-12T00:50:30Z",
  "summary": "ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning\n\nThe hand-rolled bit-scanning loop in the NCQ completion path has an\ninfinite loop bug.  When tag_mask has only high bits set (e.g.\n0x80000000), the inner while loop left-shifts tag_mask until it\noverflows to 0.  At that point !(0 & 1) is always true and 0 <<= 1\nstays 0, causing an infinite loop in hardirq context with a spinlock\nheld.\n\nReplace the open-coded bit-scanning with __ffs() which correctly\nfinds the least significant set bit and is bounded by the width of\nthe argument.",
  "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": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68449"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ea9fa4dabe476f85fe73df30a6ab61a23c22fda4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d72e8089dc332ac48293512ef0de77cbe0e04d25"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z"
  }
}