# CVE-2026-68449: linux: In the Linux kernel, the following vulnerability has been resolved:  ata: sata_dwc_460ex: fix infinite loop in NCQ ta...

CVE-2026-68449 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-68449, released August 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-68449
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 12, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.101-1 | [DEBIAN-CVE-2026-68449](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68449.md) | Aug 13, 2026 |
| Linux | linux Debian 14 | 7.1.6-1 | [DEBIAN-CVE-2026-68449](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68449.md) | Aug 13, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.101-1~deb12u1 | [DEBIAN-CVE-2026-68449](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68449.md) | Aug 13, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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