Vulnerabilities
CVE-2026-70077: Windows Kernel Use‑After‑Free Information Disclosure
Microsoft released a patch for CVE-2026-70077, a kernel‑level use‑after‑free flaw that lets local attackers read arbitrary memory. Affected Windows systems can expose sensitive data if an attacker gains local privileges. Defenders should apply the update immediately, audit local admin accounts, and monitor for anomalous memory access.
What happened
A Windows kernel use‑after‑free bug (CVE‑2026‑70077) lets a local attacker read arbitrary memory after an object has been freed. The flaw is triggered by privileged code paths that fail to zero out pointers before reuse.
Impact
Systems running any unpatched Windows version are vulnerable. An attacker with local privileges can leak kernel data, potentially exposing secrets or facilitating privilege escalation.
Mitigation
- Apply the Microsoft security update released on 2026‑10‑12.
- Restrict local administrative privileges to trusted accounts.
- Enable Windows Defender Credential Guard to isolate privileged processes.
Monitoring
Watch for anomalous memory access patterns or unexpected use‑after‑free errors in Windows logs. Review Event ID 4624 for suspicious logon activity.
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