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CVE-2026-46227 is a race condition in the Linux kernel SCTP implementation's SCTP_SENDALL handling. The association-list iteration in sctp_sendmsg() caches its next cursor before invoking sctp_sendmsg_to_asoc(). That call can release the socket lock while waiting for send-buffer space. During the unlocked interval, the cached next association may be peeled off and migrated to another endpoint, then freed after the new socket is closed, or freed following processing of an SCTP ABORT. Although the current association is revalidated when the lock is reacquired, the cached next cursor is not. Iteration can therefore dereference freed association memory or traverse a different endpoint's list head as though it were an SCTP association. The fix re-derives the next cursor from the revalidated current association after sctp_sendmsg_to_asoc() returns successfully.
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A Linux kernel vulnerability in SCTP handling, fixed in the Red Hat kpatch live patch update RHSA-2026:59149.
A Linux kernel SCTP vulnerability involving list cursor revalidation after sctp_sendmsg_to_asoc() in SCTP_SENDALL, fixed via the Red Hat kpatch live patch update.
A Linux kernel vulnerability in SCTP involving revalidation of the list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL.
A Linux kernel SCTP vulnerability related to revalidating the list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.