Microsoft Windows Kernel: Information disclosure via out-of-bounds read

Summary

An out-of-bounds read in the Windows kernel allows an unauthorized attacker with physical access to a device to disclose information. No privileges or user interaction are required, and the impact is limited to confidentiality. Patches are published, and no exploitation or public proof of concept has been reported.

Affected

• Windows 10 Version 1607: 10.0.14393.0 before 10.0.14393.9688
• Windows 10 Version 1809: 10.0.17763.0 before 10.0.17763.9487
• Windows 10 Version 21H2: 10.0.19044.0 before 10.0.19044.7846
• Windows 10 Version 22H2: 10.0.19045.0 before 10.0.19045.7846
• Windows 11 Version 23H2: 10.0.22631.0 before 10.0.22631.7711
• Windows 11 Version 24H2: 10.0.26100.0 before 10.0.26100.9974
• Windows 11 Version 25H2: 10.0.26200.0 before 10.0.26200.9974
• Windows 11 Version 26H1: 10.0.28000.0 before 10.0.28000.3501
• Windows 11 Version 26H2: 10.0.26300.0 before 10.0.26300.9974
• Windows Server 2016 (including Server Core): 10.0.14393.0 before 10.0.14393.9688
• Windows Server 2019 (including Server Core): 10.0.17763.0 before 10.0.17763.9487
• Windows Server 2022: 10.0.20348.0 before 10.0.20348.5870
• Windows Server 2025: not listed in the CVE record; verify on MSRC

Fixed in

• Install the November 2026 cumulative update for each affected branch.
• Fixed builds as listed in the CVE record are shown under "affected" (build numbers at or above the stated value).
• Third-party summaries name KB5131080 (Server 2025), KB5132043 (Windows 11 24H2/25H2/26H2, hotpatch), KB5131085 (Server 2019, Windows 10 1809) and KB5131090 (Server 2022). These are not verified against Microsoft.
• Windows 10 22H2 and Windows 11 23H2 KB numbers: unknown; confirm on MSRC.

Workaround

Unknown. No vendor-documented workaround is available. Since a fix exists, installing the update is the primary action.

• Physical-attack measures (general recommendation, not from the vendor): full-disk encryption (BitLocker), screen lock and sign-in on wake, restricting USB and external ports on unattended devices.

Exploitation

• Not known to be exploited in the wild.
• No public proof of concept found.
• CISA SSVC: exploitation none, automatable no, technical impact partial.
• Attack requires physical access.

Our recommendation

• Install the November 2026 cumulative update on all affected Windows clients and servers, prioritising mobile devices and unattended endpoints.
• Verify installed build numbers against the MSRC advisory before rollout.
• Enforce full-disk encryption, screen locks and sign-in on wake.
• Restrict USB and external port use and secure devices in physical custody.
• Servers in locked data centres are lower priority.

Public exploits iAttack code is publicly available (PoC on GitHub, Metasploit or Exploit-DB).

PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.

Research sources

• Microsoft Security Response Center: CVE-2026-96058 msrc.microsoft.com
• CVE Record CVE-2026-96058 www.cve.org
• Strix AI: CVE-2026-96058 www.strix.ai
• Senserva: KB5131080 (Windows Server 2025) senserva.com
• Senserva: KB5132043 (Windows 11 24H2/25H2/26H2) senserva.com
• Senserva: KB5131085 (Windows Server 2019, Windows 10 1809) senserva.com
• Senserva: KB5131090 (Windows Server 2022) senserva.com

Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 21:06.