What is CVE-2026-31478?

CVE-2026-31478 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()

Which CVE IDs does CVE-2026-31478 cover?

CVE-2026-31478 covers the following CVE IDs: CVE-2026-31478. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-31478?

CVE-2026-31478 has a CVSS v3 base score of 9.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-31478?

CVE-2026-31478 affects 1 product, including: cbl2 kernel 5.15.202.1-1 on CBL Mariner 2.0.

CVE-2026-31478CriticalCVSS 9.8

ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-31478 →

🎯 Affected products1

cbl2 kernel 5.15.202.1-1 on CBL Mariner 2.0

🔗 References (1)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31478