CVE-2026-68449 (GCVE-0-2026-68449)
Vulnerability from cvelistv5
Published
2026-08-12 00:51
Modified
2026-08-19 16:35
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 62936009f35a6659cc3ebe0d90c754182d60da73 Version: 62936009f35a6659cc3ebe0d90c754182d60da73 Version: 62936009f35a6659cc3ebe0d90c754182d60da73 Version: 62936009f35a6659cc3ebe0d90c754182d60da73 Version: 62936009f35a6659cc3ebe0d90c754182d60da73 Version: 62936009f35a6659cc3ebe0d90c754182d60da73 Version: 62936009f35a6659cc3ebe0d90c754182d60da73 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/ata/sata_dwc_460ex.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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{
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.36"
},
{
"lessThan": "2.6.36",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
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},
{
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{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning\n\nThe hand-rolled bit-scanning loop in the NCQ completion path has an\ninfinite loop bug. When tag_mask has only high bits set (e.g.\n0x80000000), the inner while loop left-shifts tag_mask until it\noverflows to 0. At that point !(0 \u0026 1) is always true and 0 \u003c\u003c= 1\nstays 0, causing an infinite loop in hardirq context with a spinlock\nheld.\n\nReplace the open-coded bit-scanning with __ffs() which correctly\nfinds the least significant set bit and is bounded by the width of\nthe argument."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:35:43.051Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/ea9fa4dabe476f85fe73df30a6ab61a23c22fda4"
},
{
"url": "https://git.kernel.org/stable/c/d72e8089dc332ac48293512ef0de77cbe0e04d25"
},
{
"url": "https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16"
},
{
"url": "https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80"
},
{
"url": "https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954"
},
{
"url": "https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be"
},
{
"url": "https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197"
}
],
"title": "ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68449",
"datePublished": "2026-08-12T00:51:47.140Z",
"dateReserved": "2026-07-30T09:28:09.395Z",
"dateUpdated": "2026-08-19T16:35:43.051Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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