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CVE-2026-34344 is a local privilege escalation vulnerability in the Windows Ancillary Function Driver for WinSock (afd.sys). The flaw is caused by type confusion in kernel-mode handling of resources, where the driver accesses a resource using an incompatible type. This can lead to kernel memory corruption when a locally authenticated attacker triggers the vulnerable code path through user-accessible networking or socket-related operations. The vulnerable component is a core part of the Windows networking stack and is broadly present across supported Windows desktop and server releases. Successful exploitation can allow escalation from a low-privilege local context to SYSTEM.
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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 privilege escalation vulnerability caused by type confusion (CWE-843) in the Windows Ancillary Function Driver for WinSock (afd.sys), allowing a low-privileged local user to corrupt kernel memory and escalate privileges to SYSTEM.
A local elevation of privilege vulnerability in the Windows Ancillary Function Driver for WinSock caused by type confusion, allowing 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.