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

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CVE-2026-46155

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
28/05/2026
Last modified:
30/05/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> smb/client: fix out-of-bounds read in smb2_compound_op()<br /> <br /> If a server sends a truncated response but a large OutputBufferLength, and<br /> terminates the EA list early, check_wsl_eas() returns success without<br /> validating that the entire OutputBufferLength fits within iov_len.<br /> <br /> Then smb2_compound_op() does:<br /> memcpy(idata-&gt;wsl.eas, data[0], size[0]);<br /> <br /> Where size[0] is OutputBufferLength. If iov_len is smaller than size[0],<br /> memcpy can read beyond the end of the rsp_iov allocation and leak adjacent<br /> kernel heap memory.

Impact

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

Base Score: 9.10 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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): None
Availability (A): High

Base Score 3.x
9.10
Severity 3.x
CRITICAL

References to Advisories, Solutions, and Tools