Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mptcp: ensure context reset on disconnect After the committed code below, if the MPC subflow is already in the TCPCLOSE status or has fallen back to TCP at the mptcpdisconnect time, mptcpdofastclose skips setting the sendfastclos...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, and Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: mptcp: fixed a NULL pointer in canacceptnewsubflow. When testing the valkey benchmark tool with MPTCP, the kernel panics in mptcpcanacceptnewsubflow because subflowreq-msk is NULL. Call trace: mptcpcanacceptnewsubflow...

Astra Linux – Vulnerability found in Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: mptcp: Race condition in the creation of subflows in mptcprcvspaceadjust. Additional active subflows—i.e., those created by the kernel’s internal processes—are included in the subflow list before the 3whs process starts. If a rac...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: mptcp: The “kern” flag was removed from fallback sockets. The mptcp ULP extension relies on ensuring that sk-sksockkern is set correctly. This prevents the call to setsockoptfd, IPPROTOTCP, TCPULP, "mptcp", 6 from working for pla...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mptcp: Race conditions between subflow failures and additional subflow creations. We have race conditions similar to those addressed by the previous patch, between subflow failures and additional subflow creations. However, these...

Astra Linux – Vulnerability found in Linux 5.15, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mptcp: fixed the issue of re-injecting data from stale subflows. When the MPTCP Process Manager detects that a subflow is stale, the packet scheduler must re-inject all the unacknowledged data at the mptcp level. To avoid acquiri...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, and Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: mptcp: handles DDS corruption consistently. The buggy peer implementation can send corrupted DSS options, consistently causing several warnings in the data path. Use DEBUGNET assertions to avoid errors on some builds and to handl...

Linux Distros Unpatched Vulnerability : CVE-2026-89554

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - mptcp: fix uninitialized localid in syncookie MPJOIN reconstruction mptcptokenjoincookieinitstate restores remotenonce, localnonce, backup, joinid, token and ms...

CVE-2026-89554

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized localid in syncookie MPJOIN reconstruction mptcptokenjoincookieinitstate restores remotenonce, localnonce, backup, joinid, token and msk from the saved cookie entry when rebuilding the request socket for ...

CVE-2026-89554 mptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized localid in syncookie MPJOIN reconstruction mptcptokenjoincookieinitstate restores remotenonce, localnonce, backup, joinid, token and msk from the saved cookie entry when rebuilding the request socket for ...

CVE-2026-89554

CVE-2026-89554 affects the Linux kernel's MPTCP (Multipath TCP) implementation. When reconstructing a MP_JOIN request under SYN cookies, mptcp_token_join_cookie_init_state() fails to restore the local_id field from the saved cookie entry. Because the request-sock slab is SLAB_TYPESAFE_BY_RCU and ...

EUVD-2026-76465

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized localid in syncookie MPJOIN reconstruction mptcptokenjoincookieinitstate restores remotenonce, localnonce, backup, joinid, token and msk from the saved cookie entry when rebuilding the request socket for ...

CVE-2026-89554 mptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized localid in syncookie MPJOIN reconstruction mptcptokenjoincookieinitstate restores remotenonce, localnonce, backup, joinid, token and msk from the saved cookie entry when rebuilding the request socket for ...

PT-2026-90270

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized local id in syncookie MP JOIN reconstruction mptcp token join cookie init state restores remote nonce, local nonce, backup, join id, token and msk from the saved cookie entry when rebuilding the request...

K000163237: Linux kernel vulnerability CVE-2026-53183

Security Advisory Description In the Linux kernel, the following vulnerability has been resolved: mptcp: allow subflow rcv wnd to shrink In MPTCP connection, the window field in the TCP header refers to the MPTCP-level rcvnxt and it's right edge should not move backward. Such constraint is enforc...

CVE-2026-80585

In the Linux kernel, the following vulnerability has been resolved: mptcp: fastopen: only mark MPTFO subflows with SYN data Passive TCP Fast Open accepts a valid-cookie SYN even when it carries no data. In that case the child socket's receive queue is intentionally left empty...

PT-2026-82201

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the Multipath TCP MPTCP implementation regarding TCP Fast Open TFO. The function mptcp fastopen subflow synack set params incorrectly sets the is mptfo flag before...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerabilities have been resolved: mptcp: pm: in-kernel: always marking signal+subflow endp as used Syzkaller managed to find a combination of actions that caused this warning to occur: msk-pm.localaddrused == 0 WARNING: net/mptcp/pmkernel.c:1071 at...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: In mptcp, only the ‘subflow’ endpoint is marked as available. The following warning has been added: WARNONONCEmsk-pm.localaddrused == 0 Adding this warning before decrementing the localaddrused counter helped to identify a bug wh...

Astra Linux – Vulnerability found in Linux 5.15, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mptcp: Use OPTIONMPTCPMPJSYNACK in subflowfinishconnect subflowfinishconnect uses four fields backup, joinid, thmac, none that may contain garbage unless OPTIONMPTCPMPJSYNACK has been set in mptcpParseOption...