CVE-2026-74521

criticalCVSS 9.1covered by 1 sourcefirst seen 2026-08-15

In the Linux kernel, the following vulnerability has been resolved: ksmbd: use memcmp() to compare ClientGUIDs ClientGUID is a fixed-size binary value and can contain embedded NUL bytes. strncmp() stops comparing at the first NUL byte, so different ClientGUID values can incorrectly be treated as equal. Use memcmp() in SMB3 multichannel session binding and FSCTL_VALIDATE_NEGOTIATE_INFO to compare all SMB2_CLIENT_GUID_SIZE bytes.

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Exploitation outlook

Low exploitation risk0.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalCVE-2026-74521: In the Linux kernel, the following vulnerability has been resolved: ksmbd: use memcmp() to com…nvd · 2026-08-15

External references

NVD record for CVE-2026-74521

CVE.org record

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