Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 1.3%
CVSS Severity
CVSS v3 Score 7.8