{"id":"CVE-2026-68449","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:\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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < ea9fa4dabe476f85fe73df30a6ab61a23c22fda4","Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < d72e8089dc332ac48293512ef0de77cbe0e04d25","Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < 90e8cf489b593814b9398aa187ddbb790e33ec6f","Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < 4c6e64cae2b2dab32ad9099faa339f6a72c0ce16","Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < 8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80","Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < 1842d45f461a78988254631893329bdf4596e954","Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < 29b916d3556bd12a95be7c56ca391b8cd572f8be","Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < c2130f6553f4a5cbdc259de069600117a995f197","Linux 2.6.36"],"published":"2026-08-12","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:28:40.534Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68449","references":[{"url":"https://git.kernel.org/stable/c/ea9fa4dabe476f85fe73df30a6ab61a23c22fda4"},{"url":"https://git.kernel.org/stable/c/d72e8089dc332ac48293512ef0de77cbe0e04d25"},{"url":"https://git.kernel.org/stable/c/90e8cf489b593814b9398aa187ddbb790e33ec6f"},{"url":"https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16"},{"url":"https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80"},{"url":"https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954"},{"url":"https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be"},{"url":"https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197"}],"tags":["cve.org"],"epss":0.00165,"epssPercentile":0.05776,"ingestedAt":"2026-11-05T15:02:32.466Z","slug":"CVE-2026-68449","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < ea9fa4dabe476f85fe73df30a6ab61a23c22fda4`\n- `Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < d72e8089dc332ac48293512ef0de77cbe0e04d25`\n- `Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < 90e8cf489b593814b9398aa187ddbb790e33ec6f`\n- `Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < 4c6e64cae2b2dab32ad9099faa339f6a72c0ce16`\n- `Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < 8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80`\n- `Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < 1842d45f461a78988254631893329bdf4596e954`\n- `Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < 29b916d3556bd12a95be7c56ca391b8cd572f8be`\n- `Linux >= 62936009f35a6659cc3ebe0d90c754182d60da73 < c2130f6553f4a5cbdc259de069600117a995f197`\n- `Linux 2.6.36`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}