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CVE-2026-49412

Use-after-free bug in the IPV6_MSFILTER socket option handler

High7.8EPSS 0.15%
Published
Updated
Reserved
Assigned by
freebsd

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.

Scores

CVSS scores of CVE-2026-49412, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.15% · top 95% of all CVEs (5 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Weakness

Affected products

  • FreeBSD · FreeBSD

    • affected 15.0-RELEASE – < p10
    • affected 14.4-RELEASE – < p6
    • affected 14.3-RELEASE – < p15

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .