CVE-2026-97522
Received Received - Intake

MPTCP Bad Accounting Fix in Linux Kernel

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix bad accounting in __mptcp_subflow_push_pending() If __subflow_push_pending() errors out we should avoid updating the copied byte counters, to avoid mismatch push call later on.

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Meta Information

Published
2026-09-25
Last Modified
2026-09-25
Generated
2026-09-25
AI Q&A
2026-09-25
EPSS Evaluated
N/A
NVD
CVE-2026-97522
EUVD
EUVD-2026-86830

Affected Vendors & Products

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

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a vulnerability in the Linux kernel related to the Multipath TCP (MPTCP) implementation. The issue occurs in the function __mptcp_subflow_push_pending() where an error condition leads to incorrect accounting of copied bytes. This mismatch can cause problems with push operations later.

Detection Guidance

This vulnerability is specific to the Linux kernel's MPTCP implementation and may not have direct detection commands. Check kernel logs for MPTCP-related errors or mismatches in byte counters using dmesg or journalctl. Ensure your kernel version is updated to one that includes the fix.

Impact Analysis

The impact is likely limited to network performance and reliability issues in systems using MPTCP. It may cause data transmission errors or disruptions in network connections, but does not appear to have direct security implications like privilege escalation or data leaks.

Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for CVE-2026-97522. Monitor system logs for MPTCP errors and ensure no active MPTCP sessions are affected by the accounting issue.

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