CVE-2026-49412

⚠️ high

Summary

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.

CVSS Score

7.8

High

EPSS Score

0.1

Exploit Probability

Published Date

2026-06-27

First Seen: 2026-06-28

📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 69.4% of all 338,295 vulnerabilities in our database.

#103,392

Above average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: Jun 29, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Total

Complete system compromise possible

🏆 Discovered By

Andrew Griffiths at Calif.io Maik Münch

SSVC data provided by CISA

Last Modified 2026-07-01

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE IDs (Weakness Types)

CWE-416

📦 Affected Products 3

Vendor	Product	Status	Affected Versions
freebsd	freebsd	Affected	v14.3
freebsd	freebsd	Affected	v14.4
freebsd	freebsd	Affected	v15.0

🔗 References 1

https://security.freebsd.org/advisories/FreeBSD-SA-2...

Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-45258	⚠️ high	7.8	0.2	dsp_mmap_single() validated the requested mapping by checking the sum of the user-supplied offset and length against the...	2026-06-27
CVE-2026-45259	🔶 medium	6.5	0.1	sigqueue(2) was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation...	2026-06-27
CVE-2026-49413	⚠️ high	7.1	0.1	The Linuxulator determined whether a binary was set-user-ID or set-group-ID by checking the P_SUGID process flag. Durin...	2026-06-27
CVE-2026-49417	⚠️ high	7.0	0.1	Second, the audio buffer backing a mapping could be freed when the device was closed even though the mapping remained va...	2026-06-27
CVE-2026-49414	⚠️ high	7.8	0.1	The ELF image activator cleared per-process ASLR preference flags for setuid binaries after the code that computes the P...	2026-06-27
CVE-2026-49416	⚠️ high	7.8	0.1	The CONS_HISTORY ioctl handler did not adequately validate the requested history size. A large value caused an integer ...	2026-06-27

These CVEs affect the same products