CVE-2026-68449
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.
Affected versions
Linux kernel versions
2.6.36
and later are affected. Fixed in
6.6.148,
6.12.101,
6.18.42,
7.1.6,
7.2-rc4
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-68449?
CVE-2026-68449 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 2.6.36 onward and has been patched in 6.6.148, 6.12.101, 6.18.42 and others. CVE-2026-68449 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-68449?
Yes. CVE-2026-68449 has been patched. Fixed versions include 6.6.148, 6.12.101, 6.18.42 and others. If you are running Linux kernel 2.6.36 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-68449 actively exploited?
No. CVE-2026-68449 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.