← Search CVEs

CVE-2026-70273

HIGH 7

Published 2026-10-13 · Last modified 2026-10-25

Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.

ELEVATED IMPACT

Severe if exploited (CVSS 7), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 23rd percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7CVSS 3.1 · HIGH

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

What an attacker needs

⚠Access: Requires local access to the host
⚠Privileges: Requires a low-privilege account
✓User interaction: No user interaction needed
⚠Complexity: Needs a race window or specific setup

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot: 2026-10-26T13:52:32.101Z

Affected

Vendors Microsoft

Products Windows 11 Version 24h2 Windows 11 Version 25h2 Windows 11 Version 26h1 Windows 11 Version 26h2 Windows Server 2025 Windows Server 2025 (Server Core Installation) Windows 11 24h2 Windows 11 25h2 Windows 11 26h1 Windows 11 26h2

Weakness (CWE)

CWE-416: : Use After Free

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

References and research data (JSON)

Known Affected Software Configurations

Vendor	Product	Version range
Microsoft	Windows 11 24h2	< 10.0.26100.9711
Microsoft	Windows 11 24h2	< 10.0.26100.9711
Microsoft	Windows 11 25h2	< 10.0.26200.9711
Microsoft	Windows 11 25h2	< 10.0.26200.9711
Microsoft	Windows 11 26h1	< 10.0.28000.3231
Microsoft	Windows 11 26h1	< 10.0.28000.3231
Microsoft	Windows 11 26h2	< 10.0.26300.9711
Microsoft	Windows 11 26h2	< 10.0.26300.9711
Microsoft	Windows Server 2025	< 10.0.26100.33650

All CVSS metrics

HIGH 7 v3.1 · CNA Primary
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
HIGH 7 v3.1 · NVD Secondary
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Patches & mitigations

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70273 vendor-advisorypatchPatchVendor AdvisoryCVE record · microsoft · Updated 2026-10-25T18:38:59.551Z
NVD · CVE-2026-70273 · Updated 2026-10-22T12:13:26.290

Advisories

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-99263 ADVISORYEUVD · EUVD-2026-99263

Sources: NVD · CVE.org · EPSS