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.
Metrics
Affected Vendors & Products
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References
History
Sat, 27 Jun 2026 09:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Use-after-free bug in the IPV6_MSFILTER socket option handler | |
| Weaknesses | CWE-416 | |
| References |
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MITRE
Status: PUBLISHED
Assigner: freebsd
Published:
Updated: 2026-06-27T09:02:55.482Z
Reserved: 2026-05-29T20:24:28.615Z
Link: CVE-2026-49412
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
Updated: 2026-06-27T10:30:14Z