CVE-2026-49412
Use-after-free bug in the IPV6_MSFILTER socket option handler
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-416 |
| Vendor | freebsd |
| Product | freebsd |
| Published | Jun 27, 2026 |
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Affected Versions
FreeBSD / FreeBSD
15.0-RELEASE < p10 14.4-RELEASE < p6 14.3-RELEASE < p15
References
Credits
Andrew Griffiths at Calif.io Maik Münch