mptcp: consolidate suboption status

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SUSE CVE-2025-21707

In the Linux kernel, the following vulnerability has been resolved: mptcp: consolidate suboption status MPTCP maintains the received sub-options status is the bitmask carrying the received suboptions and in several bitfields carrying per suboption additional info. Zeroing the bitmask before parsi...

DEBIAN-CVE-2025-21707

In the Linux kernel, the following vulnerability has been resolved: mptcp: consolidate suboption status MPTCP maintains the received sub-options status is the bitmask carrying the received suboptions and in several bitfields carrying per suboption additional info. Zeroing the bitmask before parsi...

CVE-2025-21707

CVE-2025-21707 details (Linux kernel MPTCP issue). The vulnerability arises in MPTCP suboption status handling, where zeroing a bitmask is insufficient and certain per-suboption bitfields may fail to be cleared/initialized. Syzkaller reported KMSAN uninitialized value paths in __mptcp_expand_seq ...