CVE-2026-80585 mptcp: fastopen: only mark MPTFO subflows with SYN data

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...

CVE-2026-80585

This vulnerability affects the Linux kernel's MPTCP (Multipath TCP) Fast Open implementation. The function mptcp_fastopen_subflow_synack_set_params() incorrectly set the is_mptfo flag before verifying that SYN data had actually been queued on the child socket's receive queue. Data-less TFO SYNs (...

CVE-2026-80585 mptcp: fastopen: only mark MPTFO subflows with SYN data

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...

CVE-2026-80588: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: mptcp: reclaim forward-allocated memory on RX path errors After commit 9db5b3cec4ec "mptcp: borrow forward memory from subflow", errors in the receive path prior to queueing skbs into the receive queue do not trigger...

Linux Distros Unpatched Vulnerability : CVE-2026-80588

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - mptcp: reclaim forward-allocated memory on RX path errors After commit 9db5b3cec4ec mptcp: borrow forward memory from subflow, errors in the receive path prior ...

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...

CVE-2026-80585: Undefined Security Weakness

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...

CVE-2026-80585: Undefined Security Weakness

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...

CVE-2026-80588: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: mptcp: reclaim forward-allocated memory on RX path errors After commit 9db5b3cec4ec "mptcp: borrow forward memory from subflow", errors in the receive path prior to queueing skbs into the receive queue do not trigger...

PT-2026-82204

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A memory leak exists in the Multipath TCP MPTCP receive path. Following a specific commit that allowed borrowing forward memory from subflows, errors occurring in the receive path before...

CVE-2026-80587: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: mptcp: avoid combining some incoming suboptions Some MPTCP suboptions are mutually exclusive according to the RFC8684, but also because in different places, the code doesn't expect some combinations to be present. That's speciall...

Linux Distros Unpatched Vulnerability : CVE-2026-80586

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - mptcp: options: reset DSS fields in case of unexpected size A remote peer could send a malformed DSS with a wrong size, followed by another DSS or MPC + Data. I...

CVE-2026-80586: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: mptcp: options: reset DSS fields in case of unexpected size A remote peer could send a malformed DSS with a wrong size, followed by another DSS or MPC + Data. In this case, the first suboption will be ignored, but leaving some...

CVE-2026-80586: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: mptcp: options: reset DSS fields in case of unexpected size A remote peer could send a malformed DSS with a wrong size, followed by another DSS or MPC + Data. In this case, the first suboption will be ignored, but leaving some...

CVE-2026-80587: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: mptcp: avoid combining some incoming suboptions Some MPTCP suboptions are mutually exclusive according to the RFC8684, but also because in different places, the code doesn't expect some combinations to be present. That's speciall...

PT-2026-82202

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A remote peer can send a malformed Data Sequence Signal DSS with an incorrect size, followed by another DSS or Multipath TCP MPTCP Control MPC and Data. This sequence causes the first...

PT-2026-82203

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the Multipath TCP MPTCP implementation where certain incoming suboptions are not properly restricted, allowing mutually exclusive suboptions to be combined. This...

Linux Distros Unpatched Vulnerability : CVE-2026-80585

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

Linux Distros Unpatched Vulnerability : CVE-2026-80587

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - mptcp: avoid combining some incoming suboptions Some MPTCP suboptions are mutually exclusive according to the RFC8684, but also because in different places, the...

Astra Linux – Vulnerability in 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...