CVE-2026-80588
Received Received - Intake

Memory Leak in Linux Kernel MPTCP Receive Path

Publication date: 2026-08-26

Last updated on: 2026-08-26

Assigner: kernel.org

Description
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 forward-allocated memory reclaiming. Prevent forward memory from growing unboundedly in pathological drop scenarios by explicitly reclaiming memory when skbs are dropped.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-26
Last Modified
2026-08-26
Generated
2026-08-26
AI Q&A
2026-08-26
EPSS Evaluated
N/A
NVD
CVE-2026-80588
EUVD
EUVD-2026-66503

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability in the Linux kernel involves improper handling of memory during errors in the Multipath TCP (MPTCP) receive path. When errors occur before data packets are queued, the system fails to reclaim forward-allocated memory, which can lead to unbounded memory growth in scenarios with frequent packet drops.

Impact Analysis

This vulnerability could cause system instability or crashes due to excessive memory consumption during network errors. It may degrade network performance and disrupt MPTCP connections, especially in environments with high packet loss or network congestion.

Mitigation Strategies

Update the Linux kernel to a patched version that includes the fix for this vulnerability. Monitor network traffic for abnormal memory usage patterns in MPTCP connections.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-80588. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart