What is CVE-2025-68291?

CVE-2025-68291 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. mptcp: Initialise rcv_mss before calling tcp_send_active_reset() in mptcp_do_fastclose().

Which CVE IDs does CVE-2025-68291 cover?

CVE-2025-68291 covers the following CVE IDs: CVE-2025-68291. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2025-68291?

CVE-2025-68291 has a CVSS v3 base score of 5.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2025-68291?

CVE-2025-68291 affects 2 products, including: azl3 kernel 6.6.119.3-1 on Azure Linux 3.0; azl3 kernel 6.6.119.3-3 on Azure Linux 3.0.

CVE-2025-68291MediumCVSS 5.5

mptcp: Initialise rcv_mss before calling tcp_send_active_reset() in mptcp_do_fastclose().

Vendor

Microsoft Security Response Center (MSRC)

Published

January 13, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2025-68291 →

🎯 Affected products2

azl3 kernel 6.6.119.3-1 on Azure Linux 3.0
azl3 kernel 6.6.119.3-3 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 6.6.121.1-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-68291
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade