CVE-2025-71155
kernel: Linux kernel KVM: Memory corruption in s390 gmap_helper_zap_one_page()
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · January 23, 2026
Updated · August 21, 2026
Description
A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) s390 component. Missing checks in the gmap_helper_zap_one_page() function could allow a local attacker with low privileges to cause memory corruption within a guest virtual machine. This could lead to a denial of service or information disclosure within the guest.
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 · 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-1285 · Improper Validation of Specified Index, Position, or Offset in Input