{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "62936009f35a6659cc3ebe0d90c754182d60da73"
            },
            {
              "fixed": "4c6e64cae2b2dab32ad9099faa339f6a72c0ce16"
            },
            {
              "fixed": "8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80"
            },
            {
              "fixed": "1842d45f461a78988254631893329bdf4596e954"
            },
            {
              "fixed": "29b916d3556bd12a95be7c56ca391b8cd572f8be"
            },
            {
              "fixed": "c2130f6553f4a5cbdc259de069600117a995f197"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.36"
            },
            {
              "fixed": "6.6.148"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.101"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.42"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68449.json"
  },
  "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 \u0026 1) is always true and 0 \u003c\u003c= 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.",
  "id": "CVE-2026-68449",
  "modified": "2026-08-18T03:31:04.834934826Z",
  "published": "2026-08-12T00:51:47.140Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68449.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68449"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning"
}