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A vulnerability in the Linux kernel's KVM subsystem for arm64 architecture was resolved, specifically in the vgic-its component. The flaw allowed userspace to restore an ITS Device Table Entry (DTE) with an out-of-range number of EventID bits, which was improperly accepted by the kernel, potentially leading to memory corruption or denial of service. This issue has been fixed by rejecting restored DTEs with num_eventid_bits exceeding the supported limit before device allocation. The vulnerability affects multiple versions of the linux-azure kernel prior to 7.0.0-28.28~24.04.1 and related builds. A patch is available and included in official Ubuntu security updates.

The vulnerability (CVE-2026-64106) in the Linux kernel's KVM arm64 vgic-its component involved improper validation of restored ITS Device Table Entries. Userspace could restore a DTE whose Size field encoded more EventID bits than the virtual ITS supports. While the live MAPD path rejects such states, the vgic_its_restore_dte() function accepted and stored the out-of-range value, which could lead to an oversized scan_its_table() range and potential memory corruption or denial of service. The fix enforces rejection of restored DTEs with num_eventid_bits greater than VITS_TYPER_IDBITS before device allocation, mirroring the MAPD check. This vulnerability is addressed in the linux-azure kernel updates provided by Ubuntu in July 2026.

Detailed information about In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_e

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits… (CVE-2026-64106) - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux azure: In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits… (CVE-2026-64106)

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