CVE-2026-49412 — Use-after-free bug in the IPV6_MSFILTER socket option handler
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 thr…
Published: 2026-06-27 · CVSS: 7.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7