CVE-2025-39823

HIGH

Linux Kernel < 5.4.298 - Improper Array Index Validation

Title source: rule

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.

References (10)

[Patch] https://git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974

[Patch] https://git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f

[Patch] https://git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695

[Patch] https://git.kernel.org/stable/c/72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48

[Patch] https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548

[Patch] https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12

[Patch] https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69

[Patch] https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb

[Third Party Advisory, Mailing List] https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html

[Third Party Advisory, Mailing List] https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html

Scores

CVSS v3 7.8

EPSS 0.0002

EPSS Percentile 4.4%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-129

Status published

Products (10)

debian/debian_linux 11.0

linux/Kernel 4.19.0 - 5.4.298linux

linux/Kernel 5.11.0 - 5.15.191linux

linux/Kernel 5.16.0 - 6.1.150linux

linux/Kernel 5.5.0 - 5.10.242linux

linux/Kernel 6.13.0 - 6.16.5linux

linux/Kernel 6.2.0 - 6.6.104linux

linux/Kernel 6.7.0 - 6.12.45linux

linux/linux_kernel 6.17 rc1 (3 CPE variants)

linux/linux_kernel 4.19 - 5.4.298

Published Sep 16, 2025

Tracked Since Feb 18, 2026