What is CVE-2026-49412?

CVE-2026-49412 is a high-severity vulnerability in Freebsd, classified under Use After Free. CVSS score: 7.8/10. Published 2026-06-27.

How severe is CVE-2026-49412?

High severity. CVSS v3 base score is 7.8 out of 10.

Use After Free in Freebsd

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 han…

Vulnerability class: Use-After-Free

EPSS: 0.001 (1.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Freebsd — versions 14.3, 15.0, 14.4-RELEASE

Weakness classification (CWE)

CWE-416 — Use After Free

References

secteam@freebsd.org (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-49412?: CVE-2026-49412 is a high-severity vulnerability in Freebsd, classified under Use After Free. CVSS score: 7.8/10. Published 2026-06-27.
How severe is CVE-2026-49412?: High severity. CVSS v3 base score is 7.8 out of 10.