GHSA-VJPX-HGC2-722C

Vulnerability from github – Published: 2026-08-12 03:31 – Updated: 2026-08-19 18:32
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68449"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-12T01:17:07Z",
    "severity": null
  },
  "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": "GHSA-vjpx-hgc2-722c",
  "modified": "2026-08-19T18:32:21Z",
  "published": "2026-08-12T03:31:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68449"
    },
    {
      "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": "WEB",
      "url": "https://git.kernel.org/stable/c/d72e8089dc332ac48293512ef0de77cbe0e04d25"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea9fa4dabe476f85fe73df30a6ab61a23c22fda4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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