EUVD-2026-44274
GHSA-c6cq-5j33-j5wh
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only kernel EoP needing a low-priv account (AV:L/PR:L); use-after-free requires winning a race and heap grooming (AC:H); success yields SYSTEM, so C/I/A all High.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Ancillary Function Driver for WinSock (AFD.sys) allows an authenticated low-privileged user to elevate to SYSTEM by triggering a use-after-free (CWE-416) in the kernel-mode driver. All actively serviced Windows client (10 1607 through 11 26H1) and Server (2012 through 2025) editions are affected, and Microsoft has released patches. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local code execution on the host as an authenticated low-privileged user (CVSS PR:L, AV:L) - this is not remotely reachable and needs no user interaction (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.0 (High) with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a foothold as a standard user - for example through phishing, a compromised service account, or a low-privilege web shell - runs a crafted local program that issues carefully sequenced WinSock/socket operations to trigger the use-after-free in AFD.sys. By grooming kernel heap allocations to reclaim the freed object and winning the underlying race (AC:H), the attacker corrupts kernel memory to execute code as SYSTEM. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-57093 for each affected edition as published in the MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57093; the specific fixed KB/build per OS version is not enumerated in the provided data and should be pulled from that advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10, Windows 11, and Windows Server (2012 through 2025) systems using your asset management tools. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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