CVE-2026-68449 (GCVE-0-2026-68449)

Vulnerability from cvelistv5 – Published: 2026-08-12 00:51 – Updated: 2026-08-19 16:35
VLAI
Title
ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 62936009f35a6659cc3ebe0d90c754182d60da73 , < ea9fa4dabe476f85fe73df30a6ab61a23c22fda4 (git)
Affected: 62936009f35a6659cc3ebe0d90c754182d60da73 , < d72e8089dc332ac48293512ef0de77cbe0e04d25 (git)
Affected: 62936009f35a6659cc3ebe0d90c754182d60da73 , < 4c6e64cae2b2dab32ad9099faa339f6a72c0ce16 (git)
Affected: 62936009f35a6659cc3ebe0d90c754182d60da73 , < 8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80 (git)
Affected: 62936009f35a6659cc3ebe0d90c754182d60da73 , < 1842d45f461a78988254631893329bdf4596e954 (git)
Affected: 62936009f35a6659cc3ebe0d90c754182d60da73 , < 29b916d3556bd12a95be7c56ca391b8cd572f8be (git)
Affected: 62936009f35a6659cc3ebe0d90c754182d60da73 , < c2130f6553f4a5cbdc259de069600117a995f197 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.36
Unaffected: 0 , < 2.6.36 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:35:43.051Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197"
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      ],
      "title": "ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning",
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    "datePublished": "2026-08-12T00:51:47.140Z",
    "dateReserved": "2026-07-30T09:28:09.395Z",
    "dateUpdated": "2026-08-19T16:35:43.051Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-12T15:50:31+00:00",
      "cve": "CVE-2026-68449",
      "id": "CVE-2026-68449",
      "initial_release_date": "2026-08-12T00:00:00+00:00",
      "product_status:known_affected": "185",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68449.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-12T16:21:40Z",
      "cve": "CVE-2026-68449",
      "id": "CVE-2026-68449",
      "initial_release_date": "2026-08-12T16:21:40Z",
      "product_status:known_affected": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68449",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68449.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.