Recorded 20 Oct 2026 at 20:53 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.
CVEMicrosoft Security Response Center
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
What it said
- CVE
- CVE-2026-85868
- Severity
- Important
- CVSS base score
- 7.0
- CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Impact
- Elevation of Privilege
- Exploitation detected
- Not reported by MSRC
- Publicly disclosed
- No
- Exploitability
- Exploitation Less Likely
- Component
- Windows Common Log File System Driver
- Weakness
- CWE-416: Use After Free
- Issued by
- Microsoft
- Customer action
- Required: apply the update
- Affected products
- Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows 11 Version 26H2 for ARM64-based Systems, Windows 11 Version 26H2 for x64-based Systems, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022 (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)
- Updates that fix it
- KB5126646: Windows Server 2025, Windows Server 2025 (Server Core installation) (restart required); KB5126651: Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation) (restart required); KB5126653: Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems (restart required); KB5126655: Windows Server 2022, Windows Server 2022 (Server Core installation) (restart required); KB5126657: Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems (restart required); KB5126835: Windows Server 2012, Windows Server 2012 (Server Core installation) (restart required); KB5126836: Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) (restart required); KB5126868: Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016, Windows Server 2016 (Server Core installation) (restart required); KB5127646: Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems (restart required); KB5127648: Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H2 for ARM64-based Systems, Windows 11 Version 26H2 for x64-based Systems (restart required)
- CISA KEV
- Not listed in the collected catalog
- EPSS
- 0.3%; scored 20 Oct 2026
- Public exploit code
- No Nuclei template listed
- Published
- 13 Oct 2026 07:00 UTC
- Last revised
- 14 Oct 2026 07:00 UTC
- Revision note
- Updated an acknowledgement. This is an informational change only.
Recorded links
Source evidence when recorded
- Microsoft security releases
- Complete at observationRead 20 Oct 2026 at 20:53 UTC
- CISA KEV
- Complete at observationRead 20 Oct 2026 at 20:53 UTC
- FIRST EPSS
- Complete at observationRead 20 Oct 2026 at 20:53 UTC
- Public exploit code
- Complete at observationRead 20 Oct 2026 at 20:53 UTC
Coverage describes the sources at this observation. A complete read then does not establish their current position.
What changed
First observed 14 Oct 2026- 20 Oct 2026 · 20:53:31 UTC EPSS0.3%; scored 19 Oct 2026 → 0.3%; scored 20 Oct 2026
- 19 Oct 2026 · 15:12:40 UTC EPSS0.3%; scored 18 Oct 2026 → 0.3%; scored 19 Oct 2026
- 18 Oct 2026 · 14:54:30 UTC EPSS0.3%; scored 16 Oct 2026 → 0.3%; scored 18 Oct 2026
- 18 Oct 2026 · 14:54:30 UTC Link: October 2026/security?release=2026-Oct#cves
- 16 Oct 2026 · 16:13:25 UTC EPSS0.3%; scored 15 Oct 2026 → 0.3%; scored 16 Oct 2026
- 15 Oct 2026 · 21:30:54 UTC EPSS0.3%; scored 14 Oct 2026 → 0.3%; scored 15 Oct 2026
- 15 Oct 2026 · 01:07:54 UTC EPSSNot scored → 0.3%; scored 14 Oct 2026
- 14 Oct 2026 · 15:58:54 UTC Revision noteInformation published. → Updated an acknowledgement. This is an informational change only.
- 14 Oct 2026 · 15:58:54 UTC Last revised13 Oct 2026 07:00 UTC → 14 Oct 2026 07:00 UTC
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