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CVE-2026-49412— Use-after-free bug in the IPV6_MSFILTER socket option handler

Quick assessment

Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeBSD是FreeBSD基金会开源的一套类Unix操作系统。 FreeBSD存在资源管理错误漏洞，该漏洞源于IPV6_MSFILTER内核处理程序释放序列化锁后未正确处理，可能导致释放后重用，本地低权限用户可利用此漏洞提升权限。

AI Predicted 7.8 Difficulty: Hard EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 3

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.0-RELEASE< p10 affected
14.4-RELEASE< p6 affected
14.3-RELEASE< p15 affected
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I. Basic Information for CVE-2026-49412

Vulnerability Information
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Vulnerability Title
Use-after-free bug in the IPV6_MSFILTER socket option handler
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会开源的一套类Unix操作系统。 FreeBSD存在资源管理错误漏洞，该漏洞源于IPV6_MSFILTER内核处理程序释放序列化锁后未正确处理，可能导致释放后重用，本地低权限用户可利用此漏洞提升权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 15.0-RELEASE ~ p10 -

II. Public POCs for CVE-2026-49412

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III. Intelligence Information for CVE-2026-49412

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Vendor Advisories for CVE-2026-49412 (1)

Same Patch Batch · FreeBSD · 2026-06-27 · 7 CVEs total

CVE-2026-49416 Integer overflow in vt(4) CONS_HISTORY ioctl
CVE-2026-49414 ASLR bypass for setuid executables via procctl(2)
CVE-2026-49413 Flaw in Linuxulator execution of setugid binaries
CVE-2026-45259 sigqueue(2) missing capability mode restriction
CVE-2026-45258 Multiple vulnerabilities in the sound(4) mmap path
CVE-2026-49417 Multiple vulnerabilities in the sound(4) mmap path

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-416

V. Comments for CVE-2026-49412

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