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.

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-25)

CWE

CWE-129

Published

2025-09-16

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• debian:debian_linux
• linux:linux_kernel

References

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

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