Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-08-26T00:00:00 kernel: mptcp: options: reset DSS fields in case of unexpected size 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-824

In the Linux kernel, the following vulnerability has been resolved: mptcp: options: reset DSS fields in case of unexpected size A remote peer could send a malformed DSS with a wrong size, followed by another DSS or MPC + Data. In this case, the first suboption will be ignored, but leaving some fields written, which could lead to inconsistency or access uninitialized data. Explicitly reset the fields that could have been modified in case of unexpected size.

A flaw was found in the Linux kernel. A remote attacker could send a malformed Data Sequence Signal (DSS) with an incorrect size. This could lead to inconsistencies or access to uninitialized data within the kernel.

Red Hat Enterprise Linux 10 Affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not 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-2026-80586 https://nvd.nist.gov/vuln/detail/CVE-2026-80586 https://lore.kernel.org/linux-cve-announce/2026082616-CVE-2026-80586-008c@gregkh/T