CVE-2025-39823

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

16/09/2025

Last modified:

16/01/2026

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: use array_index_nospec with indices that come from guest min and dest_id are guest-controlled indices. Using array_index_nospec() after the bounds checks clamps these values to mitigate speculative execution side-channels.

Impact

Vector 3.x

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

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Base Score 3.x

7.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	4.19 (including)	5.4.298 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.242 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.15.191 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.16 (including)	6.1.150 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.2 (including)	6.6.104 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.7 (including)	6.12.45 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.13 (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::::::
cpe:2.3:o:debian:debian_linux:11.0:::::::*

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

CVE-2025-39823

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools