Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-64383

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
25/07/2026
Last modified:
27/07/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> smb: client: fix double-free in SMB2_flush() replay<br /> <br /> SMB2_flush() keeps its response buffer bookkeeping across replay<br /> attempts. If a replayable flush response is received and the retry then<br /> fails before cifs_send_recv() stores a replacement response, flush_exit<br /> will free the stale response pointer a second time.<br /> <br /> Reinitialize resp_buftype and rsp_iov at the top of the replay loop so<br /> cleanup only acts on response state produced by the current attempt.<br /> This fixes a double-free without changing replay handling for successful<br /> requests.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
9.80
Severity 3.x
CRITICAL

References to Advisories, Solutions, and Tools