CVE-2026-98470 PUBLISHED

KVM: arm64: Don't WARN on an unknown VM ioctl in protected mode

Assigner: Linux
Reserved: 25.09.2026 Published: 18.10.2026 Updated: 18.10.2026

In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: Don't WARN on an unknown VM ioctl in protected mode

kvm_pkvm_ioctl_allowed() WARNs when kvm_get_cap_for_kvm_ioctl() doesn't find the ioctl number in vm_ioctl_caps[], and kvm_arch_vm_ioctl() calls it for every number the generic code doesn't handle, so ioctl(vm_fd, 0xdeadbeef) from userspace taints a pKVM host and panics it under panic_on_warn. The lookup is fed userspace input: return false, and userspace gets the -EINVAL kvm_arch_vm_ioctl() returns for that number on a host without pKVM.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from b12b3b04f6ba072ca5a618a75e546c996be94bd1 to cc53eb5c6515e3221314624a22c9da9c80a67f63 (excl.)
  • affected from b12b3b04f6ba072ca5a618a75e546c996be94bd1 to 49d9d295d69d07e850cae35933ba8519e2915f26 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 7.0 is affected
  • unaffected from 0 to 7.0 (excl.)
  • unaffected from 7.2.9 to 7.2.* (incl.)
  • unaffected from 7.3-rc5 to * (incl.)

References