CVE-2025-39823CWE-129

CVE-2025-39823

High · published September 16, 2025

CVSS v3.1
7.8
EPSS
0%
Percentile
7.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00181 · 7.3th percentile
Weakness
CWE-129 · Improper Validation of Array Index
Published
2025-09-16T17:16Z
Affected products (11)
ProductVersionsFixed in
linux/linux_kernel≥ 4.19, < 5.4.2985.4.298
linux/linux_kernel≥ 5.5, < 5.10.2425.10.242
linux/linux_kernel≥ 5.11, < 5.15.1915.15.191
linux/linux_kernel≥ 5.16, < 6.1.1506.1.150
linux/linux_kernel≥ 6.2, < 6.6.1046.6.104
linux/linux_kernel≥ 6.7, < 6.12.456.12.45
linux/linux_kernel≥ 6.13, < 6.16.56.16.5
linux/linux_kernelall versions—
linux/linux_kernelall versions—
linux/linux_kernelall versions—
debian/debian_linuxall versions—
References (11)
EPSS history
Timeline
  • 16 SEP 13:00Z
    KVM: x86: use array_index_nospec with indices that come from guest
    cvelistv5