FKIE_CVE-2026-68449

Vulnerability from fkie_nvd - Published: 2026-08-12 01:17 - Updated: 2026-08-19 17:20
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning The hand-rolled bit-scanning loop in the NCQ completion path has an infinite loop bug. When tag_mask has only high bits set (e.g. 0x80000000), the inner while loop left-shifts tag_mask until it overflows to 0. At that point !(0 & 1) is always true and 0 <<= 1 stays 0, causing an infinite loop in hardirq context with a spinlock held. Replace the open-coded bit-scanning with __ffs() which correctly finds the least significant set bit and is bounded by the width of the argument.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d72e8089dc332ac48293512ef0de77cbe0e04d25
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ea9fa4dabe476f85fe73df30a6ab61a23c22fda4
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/ata/sata_dwc_460ex.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ea9fa4dabe476f85fe73df30a6ab61a23c22fda4",
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "versionType": "git"
            },
            {
              "lessThan": "d72e8089dc332ac48293512ef0de77cbe0e04d25",
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "versionType": "git"
            },
            {
              "lessThan": "4c6e64cae2b2dab32ad9099faa339f6a72c0ce16",
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "versionType": "git"
            },
            {
              "lessThan": "8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80",
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "versionType": "git"
            },
            {
              "lessThan": "1842d45f461a78988254631893329bdf4596e954",
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "versionType": "git"
            },
            {
              "lessThan": "29b916d3556bd12a95be7c56ca391b8cd572f8be",
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "versionType": "git"
            },
            {
              "lessThan": "c2130f6553f4a5cbdc259de069600117a995f197",
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/ata/sata_dwc_460ex.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.36"
            },
            {
              "lessThan": "2.6.36",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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",
  "lastModified": "2026-08-19T17:20:50.690",
  "metrics": {},
  "published": "2026-08-12T01:17:07.810",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d72e8089dc332ac48293512ef0de77cbe0e04d25"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ea9fa4dabe476f85fe73df30a6ab61a23c22fda4"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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