CVE-2026-89924
kernel: KVM: s390: Fix old_data leak in guest debug error path
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 the Linux kernel's KVM (Kernel-based Virtual Machine) component for s390 architecture. When handling guest debug requests, a memory leak occurs if a watchpoint import fails. A local guest user could repeatedly trigger this flaw, leading to a continuous leak of memory buffers. This could eventually result in a denial of service (DoS) due to resource exhaustion.
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