CVE-2026-45889

A flaw was found in the Linux kernel's Multipath TCP MPTCP implementation. This vulnerability occurs due to incorrect accounting for out-of-order OoO data in the mptcprcvbufgrow function. A subtle and very unlikely race condition could lead to a divide-by-zero error, potentially causing a system...

UBUNTU-CVE-2026-45889

In the Linux kernel, the following vulnerability has been resolved: mptcp: do not account for OoO in mptcprcvbufgrow MPTCP-level OoOs are physiological when multiple subflows are active concurrently and will not cause retransmissions nor are caused by drops. Accounting for them in mptcprcvbufgrow...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: mptcp: fixed the NULL pointer dereferencing issue in the early fallback to fastopen. In the event of an early fallback to TCP, subflowsynrecvsock deletes the subflow context before returning the newly allocated socket to the...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix disconnect vs accept race Despite the commit 0ad529d9fd2b “mptcp: fix possible divide by zero in recvmsg”, the mptcp protocol is still prone to a race between disconnect or shutdown and accept. The root cause is that t...

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 5.10

In the Linux kernel, the following vulnerability has been resolved: mptcp: Ensure that the tx-skbs always have the MPTCP extensions. Due to signed/unsigned comparison, the expression: info-sizegoal - skb-len 0 evaluates to true when the size goal is smaller than the skb size. This results in a la...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mptcp: fixed data races related to remoteid. Similar to the previous patch, this issue was addressed by dealing with the data race on remoteid, by adding appropriate ONCE annotations...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: mptcp: pm: in-kernel: always sets ID as available when rm endp is called. Syzkaller managed to identify a combination of actions that caused this warning to occur: WARNING: net/mptcp/pmkernel.c:1074 at marksubflowendpavailable...

Astra Linux – Vulnerability found in Linux 5.10, 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...

CLSA-2026-1778769697 kernel: Fix of 31 CVEs

net: skbuff: propagate shared-frag marker through pskbcopy - HID: ignore non-functional sensor in HP 5MP Camera CVE-2025-21992 - net: fix crash when config small gsomaxsize/gsoipv4maxsize CVE-2024-50258 - ipv4: iptunnel: Fix suspicious RCU usage warning in iptunnelinitflow CVE-2024-53042 - ALSA:...

CVE-2026-43252

A flaw was found in the MultiPath TCP MPTCP subsystem of the Linux kernel. A local attacker could exploit a logic error in how MPTCP manages network connection endpoints. By performing a specific sequence of operations, an attacker could trigger a kernel warning, potentially leading to system...

EUVD-2026-27811

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: in-kernel: always set ID as avail when rm endp Syzkaller managed to find a combination of actions that was generating this warning: WARNING: net/mptcp/pmkernel.c:1074 at marksubflowendpavailable net/mptcp/pmkernel.c:10...

CVE-2026-43029 mptcp: fix soft lockup in mptcp_recvmsg()

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix soft lockup in mptcprecvmsg syzbot reported a soft lockup in mptcprecvmsg 0. When receiving data with MSGPEEK | MSGWAITALL flags, the skb is not removed from the skreceivequeue. This causes skwaitdata to always find...

CVE-2026-43029

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix soft lockup in mptcprecvmsg syzbot reported a soft lockup in mptcprecvmsg 0. When receiving data with MSGPEEK | MSGWAITALL flags, the skb is not removed from the skreceivequeue. This causes skwaitdata to always find...

CVE-2026-43029 mptcp: fix soft lockup in mptcp_recvmsg()

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix soft lockup in mptcprecvmsg syzbot reported a soft lockup in mptcprecvmsg 0. When receiving data with MSGPEEK | MSGWAITALL flags, the skb is not removed from the skreceivequeue. This causes skwaitdata to always find...

Linux kernel 安全漏洞

Linux kernel is the kernel used by Linux, the open source operating system of the Linux Foundation in the United States. A security vulnerability exists in the Linux kernel that stems from the mptcprecvmsg function in mptcp not keeping track of the last snooped skb when using MSGPEEK, which could...

Important: kernel6.12

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: remove refcounting in expectation dumpers CVE-2025-39764 In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU in ip6xmit CVE-2025-40135 In the Linux kernel, the...

Linux Distros Unpatched Vulnerability : CVE-2026-31669

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in inetlookupestablished The ehash table lookups are lockless...

DEBIAN-CVE-2026-31669

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in inetlookupestablished The ehash table lookups are lockless and rely on SLABTYPESAFEBYRCU to guarantee socket memory stability during RCU read-side critical sections. Both tcpprot and tcpv6prot ha...

EUVD-2026-25562

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in inetlookupestablished The ehash table lookups are lockless and rely on SLABTYPESAFEBYRCU to guarantee socket memory stability during RCU read-side critical sections. Both tcpprot and tcpv6prot ha...