Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-24T00:00:00 kernel: KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic 6.4 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H CWE-468

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic kvm_s390_pci_aif_enable(), kvm_s390_pci_aif_disable(), and aen_host_forward() index the GAIT by manually multiplying the index with sizeof(struct zpci_gaite). Since aift->gait is already a struct zpci_gaite pointer, this double-scales the offset, accessing element aisb*16 instead of aisb. This causes out-of-bounds accesses when aisb >= 32 (with ZPCI_NR_DEVICES=512) Fix by removing the erroneous sizeof multiplication.

A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem, specifically affecting s390 PCI devices. This vulnerability arises from incorrect pointer arithmetic during the indexing of the Guest Access Instruction Table (GAIT), leading to out-of-bounds memory access. A local attacker or a malicious guest operating system could exploit this to read or write data beyond allocated memory boundaries, potentially causing system instability or a denial of service.

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Under investigation kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Fix deferred kernel Red Hat Enterprise Linux 8 Fix deferred kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-52968 https://nvd.nist.gov/vuln/detail/CVE-2026-52968 https://lore.kernel.org/linux-cve-announce/2026062438-CVE-2026-52968-8803@gregkh/T