ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68449
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-12 01:17:07 UTC
Updated2026-08-12 01:17:07 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 62936009f35a6659cc3ebe0d90c754182d60da73 4c6e64cae2b2dab32ad9099faa339f6a72c0ce16 git Not specified
CNA Linux Linux affected 62936009f35a6659cc3ebe0d90c754182d60da73 8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80 git Not specified
CNA Linux Linux affected 62936009f35a6659cc3ebe0d90c754182d60da73 1842d45f461a78988254631893329bdf4596e954 git Not specified
CNA Linux Linux affected 62936009f35a6659cc3ebe0d90c754182d60da73 29b916d3556bd12a95be7c56ca391b8cd572f8be git Not specified
CNA Linux Linux affected 62936009f35a6659cc3ebe0d90c754182d60da73 c2130f6553f4a5cbdc259de069600117a995f197 git Not specified
CNA Linux Linux affected 2.6.36 Not specified
CNA Linux Linux unaffected 2.6.36 semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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