All vulnerabilities
CVE-2026-97792

Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability

Microsoft Windows 11 version 23H2Operating systems
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.30%Chance of exploitation activity in the next 30 days, higher than 21% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.0.22631.7652Also 10.0.26100.9711, 10.0.26200.9711 and 3 moreCVE List
Published13 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 10.0.22631.7652Windows 11 version 23H2CVE List
  • 10.0.22631.7652Windows 11 Version 23H2CVE List
  • 10.0.26100.9711Windows 11 Version 24H2CVE List
  • 10.0.26200.9711Windows 11 Version 25H2CVE List
  • 10.0.26300.9711Windows 11 Version 26H2CVE List
  • 10.0.20348.5761Windows Server 2022CVE List
Show all 8 fixed versions
  • 10.0.26100.33650Windows Server 2025CVE List
  • 10.0.26100.33650Windows Server 2025 (Server Core installation)CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Vendor and government advisories 1

Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

Description

Improper access control in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

Text from CVE List

Affected versions 8

  • Windows 11 version 23H2affected: 10.0.22631.0 before 10.0.22631.7652CVE List
  • Windows 11 Version 23H2affected: 10.0.22631.0 before 10.0.22631.7652CVE List
  • Windows 11 Version 24H2affected: 10.0.26100.0 before 10.0.26100.9711CVE List
  • Windows 11 Version 25H2affected: 10.0.26200.0 before 10.0.26200.9711CVE List
  • Windows 11 Version 26H2affected: 10.0.26300.0 before 10.0.26300.9711CVE List
  • Windows Server 2022affected: 10.0.20348.0 before 10.0.20348.5761CVE List
  • Windows Server 2025affected: 10.0.26100.0 before 10.0.26100.33650CVE List
  • Windows Server 2025 (Server Core installation)affected: 10.0.26100.0 before 10.0.26100.33650CVE List

References 1