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CVE-2026-68449

Estado: RecibidaSin puntuar—

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.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-68449",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "lessThan": "ea9fa4dabe476f85fe73df30a6ab61a23c22fda4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "lessThan": "d72e8089dc332ac48293512ef0de77cbe0e04d25",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "lessThan": "4c6e64cae2b2dab32ad9099faa339f6a72c0ce16",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "lessThan": "8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "lessThan": "1842d45f461a78988254631893329bdf4596e954",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "lessThan": "29b916d3556bd12a95be7c56ca391b8cd572f8be",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "62936009f35a6659cc3ebe0d90c754182d60da73",
              "lessThan": "c2130f6553f4a5cbdc259de069600117a995f197",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/ata/sata_dwc_460ex.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.36"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.36",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/ata/sata_dwc_460ex.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-12T01:17:07.810",
  "references": [
    {
      "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",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "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 & 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."
    }
  ],
  "lastModified": "2026-08-19T17:20:50.690",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}