CVE Explorer

CVE-2026-2636

This vulnerability is caused by a CWE‑159: "Improper Handling of Invalid Use of Special Elements" weakness, which leads to an unrecoverable inconsistency in the CLFS.sys driver. This condition forces a call to the KeBugCheckEx function, allowing an unprivileged user to trigger a system crash. Microsoft silently fixed this vulnerability in the September 2025 cumulative update for Windows 11 2024 LTSC and Windows Server 2025. Windows 25H2 (released in September) was released with the patch. Window

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:30ce890ebef6fcb1510bcd2ee41dcec77f930de2ffb7adc8a7dfff0aa26904a0

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"affected","product":"Windows OS","vendor":"Microsoft","versions":[{"lessThan":"25H2","status":"affected","version":"0","versionType":"semver"},{"lessThanOrEqual":"1123h2","status":"affected","version":"0","versionType":"semver"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:7c8bfe49990a7fc56590e212b0806211f90e22159238d7da75b46d21efa42ab9 · sha256:15ea9b183ff13238… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:7c8bfe49990a7fc56590e212b0806211f90e22159238d7da75b46d21efa42ab9 · sha256:15ea9b183ff13238… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-159","description":"CWE-159 Improper Handling of Invalid Use of Special Elements","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:7c8bfe49990a7fc56590e212b0806211f90e22159238d7da75b46d21efa42ab9 · sha256:15ea9b183ff13238… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"url":"https://www.fortra.com/security/advisories/research/fr-2026-001"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:7c8bfe49990a7fc56590e212b0806211f90e22159238d7da75b46d21efa42ab9 · sha256:15ea9b183ff13238… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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