CVE-2026-97787CWE-362

CVE-2026-97787

High · published October 13, 2026

CVSS v3.1
7.0
EPSS
0%
Percentile
9.7
In the wild
Unconfirmed
What it is

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

The record
Technical detail
CVSS v3.1
7.0 · HIGH
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00202 · 9.7th percentile
Weakness
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Published
2026-10-13T23:22Z
Affected products (12)
ProductVersionsFixed in
microsoft/windows_11_23h2< 10.0.22631.765210.0.22631.7652
microsoft/windows_11_23h2< 10.0.22631.765210.0.22631.7652
microsoft/windows_11_24h2< 10.0.26100.971110.0.26100.9711
microsoft/windows_11_24h2< 10.0.26100.971110.0.26100.9711
microsoft/windows_11_25h2< 10.0.26200.971110.0.26200.9711
microsoft/windows_11_25h2< 10.0.26200.971110.0.26200.9711
microsoft/windows_11_26h1< 10.0.28000.323110.0.28000.3231
microsoft/windows_11_26h1< 10.0.28000.323110.0.28000.3231
microsoft/windows_11_26h2< 10.0.26300.971110.0.26300.9711
microsoft/windows_11_26h2< 10.0.26300.971110.0.26300.9711
microsoft/windows_server_2022< 10.0.20348.576110.0.20348.5761
microsoft/windows_server_2025< 10.0.26100.3365010.0.26100.33650
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97787 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:35Z
    EPSS moved — → 0%
    epss
  • 13 OCT 19:01Z
    Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability
    cvelistv5
  • 13 OCT 19:01Z
    Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability
    cvelistv5