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Vulnerabilities

Vulnerability · CVE-2026-97803

Windows Kernel Elevation of Privilege Vulnerability

Published Oct 13, 2026 · catalog updated Oct 16, 2026 · windows 11 26h1

Check if you run it

No confirmed exploitation is on record for CVE-2026-97803. EPSS is 0.31%. Act only if a listed version of windows 11 26h1 is installed.

Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.31%
Remediation
Advisory link
Affected products
cpe microsoft/windows 11 26h1 · vendor Microsoft Windows 11 version 26H1

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/windows 11 26h1version unspecified
  • vendor Microsoft Windows 11 version 26H1version unspecified

How to fix CVE-2026-97803

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-97803. EPSS is 0.31%. Act only if a listed version of windows 11 26h1 is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-122: Heap-based Buffer Overflow. EPSS 0.31%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · CIRCL Vulnerability Lookup

    Detected

    Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

  2. Oct 15, 2026 · CIRCL Vulnerability Lookup

    Updated

    Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

  3. Oct 16, 2026 · NIST NVD

    Updated

    Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-97803

    Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-97803

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-97803

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-97803

    Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

    nvd.nist.gov
  • Tenable CVE DatabaseVulnerability recordCVE-2026-97803

    Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

    tenable.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.