CVE-2026-49412

highCVSS 7.8covered by 1 sourcefirst seen 2026-06-27

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.

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Exploitation outlook

Low exploitation risk0.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.

Advisory coverage (1)

highCVE-2026-49412: The kernel handler for IPV6_MSFILTER dropped a serializing lock in order to copy the source-fi…nvd · 2026-06-27

External references

NVD record for CVE-2026-49412

CVE.org record

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