Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: mptcp: Fixed an out-of-bounds condition during the parsing of TCP options. The TCP option parser in mptcp mptcpgetoptions could read one byte out of bounds. When the length of the option is 1, the execution flow enters a loop,...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mptcp: handle large GSO sizes After the committed changes below, TCP sockets and MPTCP subflows can generate egress packets that are larger than 64K. This exceeds the maximum DSS data size; the packet length is misrepresented ove...

Astra Linux – Vulnerability found in Linux 5.15, Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: mptcp: Use the appropriate destructor for IPv6. Previously, only the destructor from the TCP request sock in IPv4 was called, even if the subflow was IPv6. It is important to use the correct destructor to avoid memory leaks with...

Astra Linux – Vulnerability in Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: In mptcp, the task of cleaning up subflows was moved to mptcpDestroyCommon. If the creation of a mptcp socket fails due to the CGROUPINETSOCKCREATE eBPF program, the MPTCP protocol ends up leaking all subflows. This related clean...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mptcp: Ensure that snduna is properly initialized upon connection. This issue is strictly related to the commit fb7a0d334894 “mptcp: Ensure that sndnxt is properly initialized upon connection”. It turns out that syzkaller can...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mptcp: The issue related to “slab-use-after-free” in inetlookupestablished has been fixed. The lookups in the ehash table are performed without locking, and they rely on SLABTYPESAFEBYRCU to ensure the stability of socket memory...

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 – Vulnerabilities in Linux 5.10, Linux 5.15, Linux 6.1

In the Linux kernel, the following vulnerabilities have been resolved: mptcp: Ensure that sndnxt is properly initialized upon connection. Christoph reported a crash hinting at a corrupted snduna: WARNING: CPU: 1 PID: 38 at net/mptcp/protocol.c:1005 mptcpcleanuna+0x4b3/0x620...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15, Linux 6.1

In the Linux kernel, the following vulnerabilities have been resolved: mptcp: fixed a double-free on the socket destructor function When an MPTCP server accepts an incoming connection, it clones its listener socket. However, the pointer to ‘inetopt’ for the new socket has the same value as the...

Astra Linux – Vulnerability in Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: mptcp: A stricter state check has been added in mptcpworker. According to Christoph, the mptcp protocol can run the worker when the relevant msk socket is in an unexpected state: c connect // Incoming reset + fastclose // The mpt...

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...

Astra Linux – Vulnerability in Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: mptcp: Do not queue data on closed subflows. Dipanjan reported a critical bug fix at the last minute: WARNING: CPU: 1 PID: 10818 at net/ipv4/afinet.c:153 inetsockdestruct+0x6d0/0x8e0 net/ipv4/afinet.c:153 Linked modules:...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerabilities have been resolved: For mptcp: pm: fixed ID 0 endp usage after multiple re-creations. The values of ‘localaddrused’ and ‘addaddraccepted’ are decremented for addresses that are not related to the initial subflow ID0. This is because the source an...

CVE-2026-68169

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: userspace: fix use-after-free in getlocalid In mptcppmuserspacegetlocalid, the address entry is looked up under spinlock, but its id is read after dropping the lock. A concurrent deletion can free the entry between the...

CVE-2026-68170

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix stale skb-sk reference on subflow close The backlog list is updated by mptcpdataready under mptcpdatalock. The cleanup of backlog references to a closing subflow, however, was performed in mptcpclosessk, before...

EUVD-2026-55556

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix stale skb-sk reference on subflow close The backlog list is updated by mptcpdataready under mptcpdatalock. The cleanup of backlog references to a closing subflow, however, was performed in mptcpclosessk, before...

CVE-2026-68170 mptcp: fix stale skb->sk reference on subflow close

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix stale skb-sk reference on subflow close The backlog list is updated by mptcpdataready under mptcpdatalock. The cleanup of backlog references to a closing subflow, however, was performed in mptcpclosessk, before...

CVE-2026-68170

CVE-2026-68170, affecting Linux kernel MPTCP, describes a use-after-free risk caused by a stale backlog backlog entry referencing a closing subflow. The issue arises because backlog cleanup was performed in mptcp_close_ssk() without holding the ssk lock or mptcp_data_lock(), while concurrent RX p...

CVE-2026-68169 mptcp: pm: userspace: fix use-after-free in get_local_id

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: userspace: fix use-after-free in getlocalid In mptcppmuserspacegetlocalid, the address entry is looked up under spinlock, but its id is read after dropping the lock. A concurrent deletion can free the entry between the...