CVE-2025-39823

HIGH EPSS 6.1%
Published Sep 16, 20259mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Sep 16, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
6.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-129

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥4.19  –  <5.4.298
linuxlinux_kernel*≥5.5  –  <5.10.242
linuxlinux_kernel*≥5.11  –  <5.15.191
linuxlinux_kernel*≥5.16  –  <6.1.150
linuxlinux_kernel*≥6.2  –  <6.6.104
linuxlinux_kernel*≥6.7  –  <6.12.45
linuxlinux_kernel*≥6.13  –  <6.16.5
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
debiandebian_linux11.0any

References 11

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-032379.html
  • git.kernel.org https://git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Mailing ListThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Mailing ListThird Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb
    Patch