CVE-2026-43265
kernel: KVM: x86: Ignore -EBUSY when checking nested events from vcpu_block()
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · May 6, 2026
Updated · October 29, 2026
Description
A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) for x86 architectures. A local user or a malicious guest operating system could manipulate the virtual CPU (vCPU) state by injecting events while the vCPU is in a blocking state. This could lead to a spurious exit to userspace, potentially causing the virtual machine to crash, 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 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-1288 · Improper Validation of Consistency within Input