CVE-2026-68449ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 13 days later
· 13 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 62936009f35a6659cc3ebe0d90c754182d60da73 – < ea9fa4dabe476f85fe73df30a6ab61a23c22fda4
- affected 62936009f35a6659cc3ebe0d90c754182d60da73 – < d72e8089dc332ac48293512ef0de77cbe0e04d25
- affected 62936009f35a6659cc3ebe0d90c754182d60da73 – < 90e8cf489b593814b9398aa187ddbb790e33ec6f
- affected 62936009f35a6659cc3ebe0d90c754182d60da73 – < 4c6e64cae2b2dab32ad9099faa339f6a72c0ce16
- affected 62936009f35a6659cc3ebe0d90c754182d60da73 – < 8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80
- affected 62936009f35a6659cc3ebe0d90c754182d60da73 – < 1842d45f461a78988254631893329bdf4596e954
- affected 62936009f35a6659cc3ebe0d90c754182d60da73 – < 29b916d3556bd12a95be7c56ca391b8cd572f8be
- affected 62936009f35a6659cc3ebe0d90c754182d60da73 – < c2130f6553f4a5cbdc259de069600117a995f197
- affected 2.6.36
- unaffected < 2.6.36
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/ea9fa4dabe476f85fe73df30a6ab61a23c22fda4 (opens in a new tab)
- https://git.kernel.org/stable/c/d72e8089dc332ac48293512ef0de77cbe0e04d25 (opens in a new tab)
- https://git.kernel.org/stable/c/90e8cf489b593814b9398aa187ddbb790e33ec6f (opens in a new tab)
- https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16 (opens in a new tab)
- https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80 (opens in a new tab)
- https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954 (opens in a new tab)
- https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be (opens in a new tab)
- https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-57055 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-68449)Record last updated .