# CVE-2026-49412

> The kernel handler for IPV6_MSFILTER dropped a serializing lock in order to copy the source-filter list from userspace, then reacquired the lock. During this window another thread could free the multicast filter structure, leaving the handler with a stale pointer to freed memory. An unprivileged local user can exploit this use-after-free to escalate privileges.

- **EPSS:** 0.1%
- **CWE:** CWE-416

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-49412
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