Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2026-64257

Gravedad CVSS v3.1:
CRÍTICA
Tipo:
No Disponible / Otro tipo
Fecha de publicación:
25/07/2026
Última modificación:
30/07/2026

Descripción

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> smb: client: reject overlapping data areas in SMB2 responses<br /> <br /> Commit 53b7c271f06b ("smb: client: restrict implied bcc[0] exemption to<br /> responses without data area") restricted the implied bcc[0] length<br /> exception to responses without a data area. However, the overlap<br /> handling in __smb2_calc_size() clears data_length, which can make an<br /> invalid response appear to have no data area and so qualify for the<br /> exception.<br /> <br /> Track data area overlap separately and reject such responses before<br /> applying the length compatibility exceptions.