git.kernel.org
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git CVE-2026-68449
ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
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.
Description source: CVE List
Affected products and versions
2| Product | Source | Version range | Status |
|---|---|---|---|
LinuxBrowse Linux / LinuxDefault status: unaffected, affected | CVE List | 62936009f35a6659cc3ebe0d90c754182d60da73 to < 4c6e64cae2b2dab32ad9099faa339f6a72c0ce16 | affected |
| 62936009f35a6659cc3ebe0d90c754182d60da73 to < 8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80 | affected | ||
| 62936009f35a6659cc3ebe0d90c754182d60da73 to < 1842d45f461a78988254631893329bdf4596e954 | affected | ||
| 62936009f35a6659cc3ebe0d90c754182d60da73 to < 29b916d3556bd12a95be7c56ca391b8cd572f8be | affected | ||
| 62936009f35a6659cc3ebe0d90c754182d60da73 to < c2130f6553f4a5cbdc259de069600117a995f197 | affected | ||
| 2.6.36 | affected | ||
| Before 2.6.36 | unaffected | ||
| 6.6.148 to ≤ 6.6.* | unaffected | ||
| 6.12.101 to ≤ 6.12.* | unaffected | ||
| 6.18.42 to ≤ 6.18.* | unaffected | ||
| 7.1.6 to ≤ 7.1.* | unaffected | ||
| 7.2-rc4 to ≤ * | unaffected | ||
KernelBrowse Linux / Kernel | OSV | 2.6.36 to < 6.6.148 · Fixed in 6.6.148 | affected |
| 6.7.0 to < 6.12.101 · Fixed in 6.12.101 | affected | ||
| 6.13.0 to < 6.18.42 · Fixed in 6.18.42 | affected | ||
| 6.19.0 to < 7.1.6 · Fixed in 7.1.6 | affected |
References
8git.kernel.org
https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954 git.kernel.org
https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be git.kernel.org
https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16 git.kernel.org
https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80 git.kernel.org
https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197 github.com
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68449.json nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2026-68449