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.
INFO
Published Date :
Aug. 12, 2026, 1:17 a.m.
Last Modified :
Aug. 12, 2026, 1:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-68449
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to include the fix.
- Replace bit-scanning loop with __ffs().
- Apply kernel patches to resolve the bug.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-68449.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-68449 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-68449
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-68449 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-68449 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 12, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '62936009f35a6659cc3ebe0d90c754182d60da73', 'lessThan': '4c6e64cae2b2dab32ad9099faa339f6a72c0ce16', 'versionType': 'git'}, {'status': 'affected', 'version': '62936009f35a6659cc3ebe0d90c754182d60da73', 'lessThan': '8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80', 'versionType': 'git'}, {'status': 'affected', 'version': '62936009f35a6659cc3ebe0d90c754182d60da73', 'lessThan': '1842d45f461a78988254631893329bdf4596e954', 'versionType': 'git'}, {'status': 'affected', 'version': '62936009f35a6659cc3ebe0d90c754182d60da73', 'lessThan': '29b916d3556bd12a95be7c56ca391b8cd572f8be', 'versionType': 'git'}, {'status': 'affected', 'version': '62936009f35a6659cc3ebe0d90c754182d60da73', 'lessThan': 'c2130f6553f4a5cbdc259de069600117a995f197', 'versionType': 'git'}], 'programFiles': ['drivers/ata/sata_dwc_460ex.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.36'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.36', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc4', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/ata/sata_dwc_460ex.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954 Added Reference https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be Added Reference https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16 Added Reference https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80 Added Reference https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197