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.

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

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References
Link Providers
https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954 cve-icon cve-icon
https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be cve-icon cve-icon
https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16 cve-icon cve-icon
https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80 cve-icon cve-icon
https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197 cve-icon cve-icon
History

Wed, 12 Aug 2026 01:15:00 +0000

Type Values Removed Values Added
Description 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.
Title ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-12T00:51:47.140Z

Reserved: 2026-07-30T09:28:09.395Z

Link: CVE-2026-68449

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-12T01:17:07.810

Modified: 2026-08-12T01:17:07.810

Link: CVE-2026-68449

cve-icon Redhat

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cve-icon OpenCVE Enrichment

No data.