Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2025-21836

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
07/03/2025
Last modified:
29/10/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> io_uring/kbuf: reallocate buf lists on upgrade<br /> <br /> IORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it<br /> was created for legacy selected buffer and has been emptied. It violates<br /> the requirement that most of the field should stay stable after publish.<br /> Always reallocate it instead.

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:*:*:*:*:*:*:*:* 5.19 (including) 6.6.79 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.7 (including) 6.12.16 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.13.4 (excluding)
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools