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CVE-2026-34351 is a local elevation-of-privilege vulnerability in the Windows TCP/IP stack caused by improper synchronization during concurrent access to a shared resource, resulting in a race condition. The flaw affects the Windows TCP/IP driver and can be exploited by an authorized local attacker with low privileges. Microsoft has not published technical details about the specific vulnerable code path or exploitation primitive, but the issue is classified as CWE-362. Successful exploitation can allow the attacker to elevate execution to SYSTEM without requiring user interaction.
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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.
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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 caused by a race condition in the Windows TCP/IP driver/stack that allows a low-privileged local user to gain elevated, potentially SYSTEM-level, privileges.
A Windows TCP/IP local elevation of privilege vulnerability caused by a race condition that can allow an authorized attacker with low privileges 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.