CVE-2026-64286

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxbe66e67f175096f283c9d5614c4991fc9e7ed975 < 477145860dba4c30f0b4e36f02f4c5291c1c888baffected
LinuxLinuxbe66e67f175096f283c9d5614c4991fc9e7ed975 < dfaef40d8a1533940fc1af788d70fce07362b4ceaffected
LinuxLinuxbe66e67f175096f283c9d5614c4991fc9e7ed975 < 6bea2f8becdb20d34378493c3b77a9b9cf8c6cfaaffected
LinuxLinuxbe66e67f175096f283c9d5614c4991fc9e7ed975 < d4f4d61715d1061ba83b88196a3605662be30750affected
LinuxLinuxbe66e67f175096f283c9d5614c4991fc9e7ed975 < e8042f6e1d7befb2fb6b10a75918642bcd0acf9aaffected
LinuxLinux6.2affected
LinuxLinux0 < 6.2unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References