FKIE_CVE-2026-74365
Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
nvdimm/btt: Handle preemption in BTT lane acquisition
BTT lanes serialize access to per-lane metadata and workspace state
during BTT I/O. The btt-check unit test reports data mismatches during
BTT writes due to a race in lane acquisition that can lead to silent
data corruption.
The existing lane model uses a spinlock together with a per-CPU
recursion count. That recursion model stopped being valid after BTT
lanes became preemptible: another task can run on the same CPU,
observe a non-zero recursion count, bypass locking, and use the same
lane concurrently.
BTT lanes are also held across arena_write_bytes() calls. That path
reaches nsio_rw_bytes(), which flushes writes with nvdimm_flush().
Some provider flush callbacks can sleep, making a spinlock the wrong
primitive for the lane lifetime.
Replace the spinlock-based recursion model with a dynamically
allocated per-lane mutex array and take the lane lock
unconditionally.
Add might_sleep() to catch any future atomic-context caller.
Found with the ndctl unit test btt-check.sh.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"Documentation/driver-api/nvdimm/btt.rst",
"drivers/nvdimm/nd.h",
"drivers/nvdimm/region_devs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735",
"status": "affected",
"version": "f23859748e3d530217b197e146a9ac84faf0a282",
"versionType": "git"
},
{
"lessThan": "73e35c1bdfa160b41fdbe204e02325f0687de506",
"status": "affected",
"version": "6f50b414f1a0d790f11a6438a3ad6d0577eb2c18",
"versionType": "git"
},
{
"lessThan": "417918783bcfe0be135019df16a267b3af442efd",
"status": "affected",
"version": "36c75ce3bd299878fd9b238e9803d3817ddafbf3",
"versionType": "git"
},
{
"lessThan": "5c53406098b599c420b031e6ec5ba8a2f3794c50",
"status": "affected",
"version": "36c75ce3bd299878fd9b238e9803d3817ddafbf3",
"versionType": "git"
},
{
"lessThan": "4eafa810b042d985ec6bbf5b514414e73cee6f6f",
"status": "affected",
"version": "36c75ce3bd299878fd9b238e9803d3817ddafbf3",
"versionType": "git"
},
{
"lessThan": "8d4b989d9c9afe5f185aa5853b666fc4617afe9e",
"status": "affected",
"version": "36c75ce3bd299878fd9b238e9803d3817ddafbf3",
"versionType": "git"
},
{
"status": "affected",
"version": "2577fece583c7c05cda7ad50dde7638c962665e1",
"versionType": "git"
},
{
"status": "affected",
"version": "40ba3fa21250e361bdd8f00800b3e2cb6160de95",
"versionType": "git"
},
{
"status": "affected",
"version": "b0e7a935739f33ed2bd6868b89f97dd4c2683c26",
"versionType": "git"
},
{
"status": "affected",
"version": "66eb7b7f23dd9aec5356e7054dd3596ae7648ff5",
"versionType": "git"
},
{
"status": "affected",
"version": "b27751fb1f271bbb78d5993c0b10011628e40e18",
"versionType": "git"
},
{
"lessThan": "6.1.178",
"status": "affected",
"version": "6.1.63",
"versionType": "semver"
},
{
"lessThan": "6.6.145",
"status": "affected",
"version": "6.6.2",
"versionType": "semver"
},
{
"lessThan": "4.20",
"status": "affected",
"version": "4.19.299",
"versionType": "semver"
},
{
"lessThan": "5.5",
"status": "affected",
"version": "5.4.261",
"versionType": "semver"
},
{
"lessThan": "5.11",
"status": "affected",
"version": "5.10.201",
"versionType": "semver"
},
{
"lessThan": "5.16",
"status": "affected",
"version": "5.15.139",
"versionType": "semver"
},
{
"lessThan": "6.6",
"status": "affected",
"version": "6.5.12",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"Documentation/driver-api/nvdimm/btt.rst",
"drivers/nvdimm/nd.h",
"drivers/nvdimm/region_devs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"lessThan": "6.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvdimm/btt: Handle preemption in BTT lane acquisition\n\nBTT lanes serialize access to per-lane metadata and workspace state\nduring BTT I/O. The btt-check unit test reports data mismatches during\nBTT writes due to a race in lane acquisition that can lead to silent\ndata corruption.\n\nThe existing lane model uses a spinlock together with a per-CPU\nrecursion count. That recursion model stopped being valid after BTT\nlanes became preemptible: another task can run on the same CPU,\nobserve a non-zero recursion count, bypass locking, and use the same\nlane concurrently.\n\nBTT lanes are also held across arena_write_bytes() calls. That path\nreaches nsio_rw_bytes(), which flushes writes with nvdimm_flush().\nSome provider flush callbacks can sleep, making a spinlock the wrong\nprimitive for the lane lifetime.\n\nReplace the spinlock-based recursion model with a dynamically\nallocated per-lane mutex array and take the lane lock\nunconditionally.\n\nAdd might_sleep() to catch any future atomic-context caller.\n\nFound with the ndctl unit test btt-check.sh."
}
],
"id": "CVE-2026-74365",
"lastModified": "2026-08-17T06:19:31.297",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.5,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T06:22:38.143",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/417918783bcfe0be135019df16a267b3af442efd"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4eafa810b042d985ec6bbf5b514414e73cee6f6f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/5c53406098b599c420b031e6ec5ba8a2f3794c50"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/73e35c1bdfa160b41fdbe204e02325f0687de506"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/8d4b989d9c9afe5f185aa5853b666fc4617afe9e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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