CVE-2026-68449ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
Updated under an hour ago ()
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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
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 62936009f35a6659cc3ebe0d90c754182d60da73 before ea9fa4dabe476f85fe73df30a6ab61a23c22fda4; from 62936009f35a6659cc3ebe0d90c754182d60da73 before d72e8089dc332ac48293512ef0de77cbe0e04d25; 62936009f35a6659cc3ebe0d90c754182d60da73 builds before 4c6e64cae2b2dab32ad9099faa339f6a72c0ce16; 62936009f35a6659cc3ebe0d90c754182d60da73 builds before 8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80; 62936009f35a6659cc3ebe0d90c754182d60da73 builds before 1842d45f461a78988254631893329bdf4596e954; 62936009f35a6659cc3ebe0d90c754182d60da73 builds before 29b916d3556bd12a95be7c56ca391b8cd572f8be; from 62936009f35a6659cc3ebe0d90c754182d60da73 before c2130f6553f4a5cbdc259de069600117a995f197 | CNA record |
References
- https://git.kernel.org/stable/c/ea9fa4dabe476f85fe73df30a6ab61a23c22fda4
- https://git.kernel.org/stable/c/d72e8089dc332ac48293512ef0de77cbe0e04d25
- https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16
- https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80
- https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954
- https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be
- https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.