CVE-2026-68449
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.
How to fix
- Linux Linuxea9fa4dabe476f85fe73df30a6ab61a23c22fda4, d72e8089dc332ac48293512ef0de77cbe0e04d25, 90e8cf489b593814b9398aa187ddbb790e33ec6f, 4c6e64cae2b2dab32ad9099faa339f6a72c0ce16, 8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80, 1842d45f461a78988254631893329bdf4596e954, 29b916d3556bd12a95be7c56ca391b8cd572f8be, c2130f6553f4a5cbdc259de069600117a995f197 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 62936009f35a6659cc3ebe0d90c754182d60da73 ≤ v < ea9fa4dabe476f85fe73df30a6ab61a23c22fda4, 62936009f35a6659cc3ebe0d90c754182d60da73 ≤ v < d72e8089dc332ac48293512ef0de77cbe0e04d25, 62936009f35a6659cc3ebe0d90c754182d60da73 ≤ v < 90e8cf489b593814b9398aa187ddbb790e33ec6f, 62936009f35a6659cc3ebe0d90c754182d60da73 ≤ v < 4c6e64cae2b2dab32ad9099faa339f6a72c0ce16, 62936009f35a6659cc3ebe0d90c754182d60da73 ≤ v < 8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80, 62936009f35a6659cc3ebe0d90c754182d60da73 ≤ v < 1842d45f461a78988254631893329bdf4596e954, 62936009f35a6659cc3ebe0d90c754182d60da73 ≤ v < 29b916d3556bd12a95be7c56ca391b8cd572f8be, 62936009f35a6659cc3ebe0d90c754182d60da73 ≤ v < c2130f6553f4a5cbdc259de069600117a995f197, 2.6.36 | ea9fa4dabe476f85fe73df30a6ab61a23c22fda4, d72e8089dc332ac48293512ef0de77cbe0e04d25, 90e8cf489b593814b9398aa187ddbb790e33ec6f, 4c6e64cae2b2dab32ad9099faa339f6a72c0ce16, 8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80, 1842d45f461a78988254631893329bdf4596e954, 29b916d3556bd12a95be7c56ca391b8cd572f8be, c2130f6553f4a5cbdc259de069600117a995f197 |
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