CVE-2025-39823

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.

Score

CVSS 3.1 7.8 High

Status

Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2025-09-16

Last modified

2026-10-19

Weaknesses

CWE-129

Affected products

• Debian Linux (Debian)
• Linux Kernel (Linux)
• Simatic Cn 4100 (Siemens)

References

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