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CVE-2026-34345 is a local elevation-of-privilege vulnerability in the Windows Ancillary Function Driver for WinSock (afd.sys). The flaw is described as a type confusion issue and is also associated with improper synchronization and race-condition behavior that can lead to a use-after-free condition in kernel memory handling. By triggering carefully timed operations against the afd.sys WinSock driver interface, an authorized low-privileged local attacker may corrupt kernel object state and escalate privileges. Microsoft rated the issue as Important and assigned CVSS 3.1 7.0 with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
Another elevation of privilege vulnerability in the same afd.sys WinSock driver, mentioned only as background context.
A local elevation of privilege vulnerability in the Windows Ancillary Function Driver for WinSock caused by a race condition and use-after-free condition, allowing an authorized attacker 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.