CVE-2026-70054: Windows NetBIOS Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows NetBIOS allows an authorized attacker to elevate privileges locally.
Other sources
Windows NetBIOS Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
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Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
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Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
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Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
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Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
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Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
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Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
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Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
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Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
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Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
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Fixed in 10.0.26300.9711Patch KB5127648
Event History
Frequently Asked Questions
Who is exposed to this vulnerability?
Systems running the listed Microsoft Windows client or server products are in scope. Exploitation is local, so the attacker must already be able to execute as an authorized user on the affected system.
What access does an attacker need to exploit it?
The attacker needs local access and low-level privileges; no user interaction is required. Successful exploitation can result in elevation of privilege with high impact to confidentiality, integrity, and availability.
Is this remotely exploitable?
The supplied vector identifies the attack vector as local. The available information does not indicate that network-only access is sufficient.
Which product versions or patch levels are affected?
The data identifies affected Windows product families but does not provide specific version, build, update, or fixed-version information. Consult the referenced Microsoft advisory to determine applicability to a particular system.