CVE-2026-49412
HIGHUse-after-free bug in the IPV6_MSFILTER socket option handler
Title source: cnaDescription
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.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc
Scores
CVSS v3
7.8
EPSS
0.0010
EPSS Percentile
1.3%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-416
Status
published
Products (6)
freebsd/freebsd
14.3 (15 CPE variants)
freebsd/freebsd
14.4 (6 CPE variants)
freebsd/freebsd
15.0 (10 CPE variants)
FreeBSD/FreeBSD
14.3-RELEASE - p15
FreeBSD/FreeBSD
14.4-RELEASE - p6
FreeBSD/FreeBSD
15.0-RELEASE - p10
Published
Jun 27, 2026
Tracked Since
Jun 27, 2026