CVE-2025-39823

KVM: x86: use array_index_nospec with indices that come from guest

Published: 9/16/2025 Last updated: 5/12/2026 Reserved: 4/16/2025

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.

CNA assigner: Linux (416baaa9-dc9f-4396-8d5f-8c081fb06d67) Requested by: n/a

Opam packages affected (29)

albatross cdrom conf-bpftool conf-libbpf conf-linux-libc-dev core core_unix hvsock mirage-block-unix mm ocaml-probes ortools_solvers orun rawlink rawlink-eio rawlink-lwt restricted shell solo5 solo5-bindings-hvt solo5-bindings-spt solo5-cross-aarch64 solo5-kernel-ukvm tracy-client tuntap uring vhd-format vhd-format-lwt xapi-stdext-unix

Products affected (4)

Product	Vendor	Version
Linux	Linux	n/a
Linux	Linux	n/a
Linux	Linux	10.1.3.0
Linux	Linux	< 14.1X53-D48

CVE-2025-39823

KVM: x86: use array_index_nospec with indices that come from guest

Opam packages affected (29)

Products affected (4)

References (22)