EUVD-2026-82985
GHSA-grx3-v6wv-8gq8
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Any unprivileged local user can trivially trigger the driver crash (AV:L/AC:L/PR:L/UI:N), yielding availability-only impact (A:H) with no confidentiality or integrity effect and no scope change.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
1DescriptionCVE.org
WinFsp through 2.2.26215 contains a null pointer dereference vulnerability in the kernel driver's Fast I/O device control handler that fails to validate the volume context before use. An unprivileged local user can trigger a denial of service by opening the WinFsp control device and issuing FSP_IOCTL_TRANSACT requests, causing a system crash.
AnalysisAI
Denial of service in WinFsp through 2.2.26215 allows an authenticated, unprivileged local user to crash the Windows kernel by issuing FSP_IOCTL_TRANSACT requests to the WinFsp control device, triggering a null pointer dereference in the driver's Fast I/O device control handler. The vulnerability requires local access (PR:L) and a system with WinFsp installed; it results only in a system crash with no data exposure or code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an interactive or programmatic unprivileged local account on a Windows host that has the WinFsp kernel driver installed and its control device accessible (PR:L, AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but modest-severity local availability issue, not a top-priority remote threat. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor patch or upgrade WinFsp to a version beyond 2.2.26215; the upstream fix is in commit b8103265ec63fa87ac264c62bb796dbc38376652 (https://github.com/winfsp/winfsp/commit/b8103265ec63fa87ac264c62bb796dbc38376652), though the exact patched release version is not specified in the advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Local privilege escalation to SYSTEM in WinFsp (Windows File System Proxy) stems from an integer overflow (CWE-190) that
A race condition in WinFsp enables local privilege escalation to SYSTEM through kernel heap overflow. Authenticated loca
Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today