CVE-2026-64286
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU flush_hyp_vcpu() copies the host vCPU context into the hyp's private vCPU on every run. ctxt_to_vcpu() expects a guest context to have a NULL __hyp_running_vcpu, which is only ever set on the host context, so that it resolves the vCPU via container_of(). While this is generally the case, flush_hyp_vcpu() copies the context verbatim and does not enforce this, so a value provided by the host is dereferenced at EL2 (host -> EL2). Fix by clearing __hyp_running_vcpu after the copy.
How to fix
- linux linux_kernel6.6.145, 6.12.97, 6.18.39, 7.1.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 6.2 ≤ v < 6.6.145, 6.7 ≤ v < 6.12.97, 6.13 ≤ v < 6.18.39, 6.19 ≤ v < 7.1.4 | 6.6.145, 6.12.97, 6.18.39, 7.1.4 |
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