CVE-2026-99120
kernel: KVM: x86/mmu: Cope with the SS bit being set in #NPF exit codes
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 28, 2026
Updated · October 29, 2026
Description
A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem. Improper validation of error codes generated during nested virtualization memory faults leads to an out-of-bounds read vulnerability. An attacker within a guest virtual machine can exploit this issue by triggering specific page faults, potentially causing the host system to crash and resulting in a Denial of Service (DoS).
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-125 · Out-of-bounds Read