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CVE-2026-53246 is an improper length-validation vulnerability in the Linux kernel SCTP implementation. When a listening SCTP endpoint processes a COOKIE_ECHO chunk, it parses a cached peer INIT chunk embedded in the cookie payload. The declared INIT chunk length was not checked against the remaining COOKIE_ECHO buffer before subsequent parameter parsing by sctp_process_init() and sctp_walk_params(). A crafted inflated length can cause parsing beyond the received data, resulting in out-of-bounds reads and potential memory corruption during subsequent parameter handling, including STATE_COOKIE handling and memory-copy operations. The fix validates the cached INIT chunk length in sctp_unpack_cookie() against the available COOKIE_ECHO payload data.
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Linux kernel SCTP flaw caused by inadequate validation of cached peer INIT chunk length during COOKIE-ECHO processing.
Improper cached INIT chunk length validation in Linux kernel SCTP.
A vulnerability referenced in an Oracle Linux 8 kernel-package security update; the content provides no technical flaw details.
Linux kernel SCTP flaw caused by insufficient validation of cached peer INIT chunk length during COOKIE_ECHO processing.
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Cross-references every affected SKU, including bundled OEM variants.
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