CVE-2026-53246

In the Linux kernel, the following vulnerability has been resolved: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing When a listening SCTP server processes a COOKIE_ECHO chunk, the cached peer INIT chunk embedded after the cookie is parsed and its parameters are later walked by sctp_process_init() using sctp_walk_params(). However, the chunk header length of this cached INIT chunk was not validated against the remaining buffer in the COOKIE_ECHO payload. If the length field is inflated, the parameter walk can run beyond the actual received data, leading to out-of-bounds reads and potential memory corruption during later parameter handling (e.g. STATE_COOKIE processing and kmemdup() copies). Add a bounds check in sctp_unpack_cookie() to ensure the cached INIT chunk length does not exceed the available data in the COOKIE_ECHO buffer before it is used.

• CWE-787

• https://git.kernel.org/stable/c/0861615c28de668669d748ef4eb913ea9262d13bPatch
• https://git.kernel.org/stable/c/cc272185c9a9a4b7febc2de52eeaa3d00f19091ePatch
• https://git.kernel.org/stable/c/edccbf3d63b0a3362bc916ea72edacc1e1ca456aPatch

Published

Jun 25, 2026

Last Modified

Jul 7, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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