CVE-2026-89923
kernel: KVM: s390: Free guest debug data on vcpu destroy
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 16, 2026
Updated · October 6, 2026
Description
A flaw was found in KVM s390. A memory leak occurs in the Kernel-based Virtual Machine (KVM) for s390 architecture when a virtual CPU (vCPU) is destroyed while hardware breakpoints are still active, as the associated debug data is not properly freed. A local attacker or a malicious guest operating system could trigger this condition. Over time, this can lead to resource exhaustion and a Denial of Service (DoS) for the host system.
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-772 · Missing Release of Resource after Effective Lifetime