18-year-old SCTPhantom Linux flaw lets local users gain root and escape containers

A Linux kernel use-after-free flaw in SCTP, tracked as CVE-2026-64564 and dubbed SCTPhantom, has been used to escape containers and obtain root on the underlying host. Tencent Zhuque Lab reports six successful host-root escapes in eight attempts, even with the default seccomp profile and without `CAP_NET_ADMIN` or `CAP_SYS_ADMIN`. Source

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