CVE-2026-64106: KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits
In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: vgic-its: Reject restored DTE with out-of-range numeventidbits
Userspace can restore an ITS Device Table Entry whose Size field encodes more EventID bits than the virtual ITS supports. The live MAPD path rejects that state, but vgicitsrestoredte() accepts it and stores the out-of-range value in dev->numeventidbits.
Reject restored DTEs with numeventidbits > VITSTYPERIDBITS before allocating the device. This mirrors the MAPD check and prevents the restored state from reaching vgicitsrestoreitt(), where the unchecked value can be converted into an oversized scanitstable() range.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-64106?
CVE-2026-64106 has a critical severity rating of 9 according to the CVSS 3.1 scoring system.
How does CVE-2026-64106 impact KVM users?
CVE-2026-64106 allows userspace to restore an ITS Device Table Entry that may encode more EventID bits than the virtual ITS supports, leading to potential system instability.
How do I fix CVE-2026-64106?
To fix CVE-2026-64106, ensure that you upgrade to the latest version of the Linux kernel where the vulnerability is addressed.
What systems are affected by CVE-2026-64106?
CVE-2026-64106 affects Linux kernel systems that utilize KVM for virtualization, particularly those configured with arm64 architecture.
What are the potential consequences of CVE-2026-64106?
If exploited, CVE-2026-64106 could lead to denial of service conditions due to instability in the KVM virtual environment.