Windows 10 KB5049981 update released with new BYOVD blocklist
ID: 81ef85cd-de5c-554c-93a0-c1b5de2e1aff
STIX ID: report--81ef85cd-de5c-554c-93a0-c1b5de2e1aff
Feed Name: Bleeping Computer
Threat Score
Microsoft released KB5049981 for Windows 10 (21H2/22H2), a mandatory January 2025 cumulative update that updates the kernel vulnerable driver blocklist to prevent BYOVD (Bring Your Own Vulnerable Driver) attacks that can enable privilege escalation and rootkit installation; the update raises builds to 19044.5371/19045.5371, is available via Windows Update or the Microsoft Update Catalog, and includes known issues affecting OpenSSH startup and some Citrix components.
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