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

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CVE-2025-39822

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
16/09/2025
Last modified:
14/01/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> io_uring/kbuf: fix signedness in this_len calculation<br /> <br /> When importing and using buffers, buf-&gt;len is considered unsigned.<br /> However, buf-&gt;len is converted to signed int when committing. This can<br /> lead to unexpected behavior if the buffer is large enough to be<br /> interpreted as a negative value. Make min_t calculation unsigned.

Impact

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

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.12 (including) 6.16.5 (excluding)
cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools