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CVE-2026-64257

kernel: smb: client: reject overlapping data areas in SMB2 responses

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Severity

Moderate

Red Hat Product Security

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CVSS

Review impact separately from score.

Published · July 25, 2026

Updated · October 20, 2026

Description

A flaw was found in the Linux kernel's Server Message Block (SMB) client. A remote attacker could exploit a vulnerability where the client improperly handles SMB2 responses containing overlapping data areas. This incorrect processing of malformed network data could lead to a denial of service (DoS) or other severe system impact, compromising the availability and potentially the confidentiality of the affected system.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CWE-130 · Improper Handling of Length Parameter Inconsistency