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CVE-2026-34334 is a local elevation of privilege vulnerability in the Windows TCP/IP kernel driver. The flaw is caused by improper synchronization of a shared resource during concurrent execution, resulting in a race condition in the networking stack. An authorized local attacker with low privileges can exploit this weakness to trigger unsafe kernel-level behavior and elevate privileges. The vulnerable component is present on affected supported Windows client and server platforms, and successful exploitation can result in execution with SYSTEM-level privileges.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local elevation of privilege vulnerability in Windows TCP/IP caused by a race condition, allowing an authorized attacker with low privileges to elevate to SYSTEM.
A local privilege escalation vulnerability in the Windows TCP/IP kernel driver (tcpip.sys) caused by improper synchronization of a shared resource, allowing a low-privileged authenticated user to gain SYSTEM privileges.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.