Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-25T00:00:00 kernel: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing 7.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H CWE-130

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.

A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. A remote attacker could exploit this by sending a specially crafted COOKIE_ECHO chunk to a listening SCTP server. The server's failure to properly validate the length of a cached peer INIT chunk within the COOKIE_ECHO payload could lead to out-of-bounds reads and memory corruption. This could result in a denial of service or potentially information disclosure.

SCTP COOKIE_ECHO processing failed to validate the cached peer INIT chunk length against the remaining cookie buffer, allowing a remote SCTP peer to make parameter parsing walk beyond received data and potentially trigger OOB reads or later memory corruption in SCTP parameter handling. This allows sctp_process_init() and sctp_walk_params() to walk beyond the actual received buffer and can lead to out-of-bounds reads during later parameter handling such as STATE_COOKIE processing and kmemdup() copies. To mitigate this issue, prevent module sctp from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Red Hat Enterprise Linux 10 Affected kernel Red Hat Enterprise Linux 6 Out of support scope kernel Red Hat Enterprise Linux 7 Affected kernel Red Hat Enterprise Linux 7 Affected kernel-rt Red Hat Enterprise Linux 8 Affected kernel Red Hat Enterprise Linux 8 Affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53246 https://nvd.nist.gov/vuln/detail/CVE-2026-53246 https://lore.kernel.org/linux-cve-announce/2026062512-CVE-2026-53246-e748@gregkh/T