OESA-2026-1947 kernel security update

The Linux Kernel, the operating system core itself. Security Fixes: In the Linux kernel, the following vulnerability has been resolved: mptcp: Initialise rcvmss before calling tcpsendactivereset in mptcpdofastclose. syzbot reported divide-by-zero in tcpselectwindow by MPTCP socket. 0 We had a...

mptcp: Initialise rcv_mss before calling tcp_send_active_reset() in mptcp_do_fastclose().

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AZL-74172 CVE-2025-68291 affecting package kernel for versions less than 6.6.121.1-1

In the Linux kernel, the following vulnerability has been resolved: mptcp: Initialise rcvmss before calling tcpsendactivereset in mptcpdofastclose. syzbot reported divide-by-zero in tcpselectwindow by MPTCP socket. 0 We had a similar issue for the bare TCP and fixed in commit 499350a5a6e7 "tcp:...

CVE-2025-68291

The CVE-2025-68291 issue affects the Linux kernel MPTCP path: in mptcp_do_fastclose(), rcv_mss was not initialised before triggering tcp_send_active_reset(), leading to a divide-by-zero in __tcp_select_window() for MPTCP sockets. The fix mirrors a prior bare-TCP patch by initialising rcv_mss (to ...