title: KVM: VMX: Disable preemption when probing user return MSRs
description: In the Linux kernel, the following vulnerability has been resolved:
KVM: VMX: Disable preemption when probing user return MSRs
Disable preemption when probing a user return MSR via RDSMR/WRMSR.  If
the MSR holds a different value per logical CPU, the WRMSR could corrupt
the host's value if KVM is preempted between the RDMSR and WRMSR, and
then rescheduled on a different CPU.
Opportunistically land the helper in common x86, SVM will use the helper
in a future commit.
affected:
{
product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 4be534102624, lessThan: 31f29749ee97, status: affected, versionType: git
version: 4be534102624, lessThan: 5adcdeb57007, status: affected, versionType: git
version: 4be534102624, lessThan: e3ea1895df71, status: affected, versionType: git
version: 4be534102624, lessThan: 5104d7ffcf24, status: affected, versionType: git
}
{
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 5.5, status: affected
version: 0, lessThan: 5.5, status: unaffected, versionType: custom
version: 5.10.38, lessThanOrEqual: 5.10.*, status: unaffected, versionType: custom
version: 5.11.22, lessThanOrEqual: 5.11.*, status: unaffected, versionType: custom
version: 5.12.5, lessThanOrEqual: 5.12.*, status: unaffected, versionType: custom
version: 5.13, lessThanOrEqual: *, status: unaffected, versionType: original_commit_for_fix
}
