CVE-2026-49412
CVE-2026-49412 is a high-severity vulnerability in Freebsd with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- EPSS exploit prediction: 0% (1st percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-416
- Affected product: Freebsd
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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 handler with a stale pointer to freed memory. An unprivileged local user can exploit this use-after-free to escalate privileges.
- How severe is CVE-2026-49412?
- CVE-2026-49412 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-49412 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-49412?
- CVE-2026-49412 primarily affects Freebsd. In total, 31 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2026-49412?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2026-49412 published?
- CVE-2026-49412 was published on 2026-06-27 and last updated on 2026-07-01.
References
Affected products (31)
- cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p10:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p11:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p12:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p13:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p14:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p8:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.3:p9:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:14.4:p5:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:*
- cpe:2.3:o:freebsd:freebsd:15.0:p9:*:*:*:*:*:*
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