CVE-2026-68449: ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
In the Linux kernel, the following vulnerability has been resolved:
ata: satadwc460ex: 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 tagmask has only high bits set (e.g. 0x80000000), the inner while loop left-shifts tagmask 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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-68449?
The severity of CVE-2026-68449 is rated as risk 23.
How do I fix CVE-2026-68449?
To fix CVE-2026-68449, you should update your Linux kernel to the latest patched version.
What type of vulnerability is CVE-2026-68449?
CVE-2026-68449 is a bug that results in an infinite loop in the NCQ tag completion bit-scanning process.
Which software is affected by CVE-2026-68449?
CVE-2026-68449 affects the Linux kernel, specifically the SATA driver 'sata_dwc_460ex'.
When was CVE-2026-68449 published?
CVE-2026-68449 was published on August 12, 2026.