[SRU][J][PATCH 0/1] CVE-2025-37849

[Massimiliano Pellizzer]

[ Impact ]

KVM: arm64: Tear down vGIC on failed vCPU creation

If kvm_arch_vcpu_create() fails to share the vCPU page with the
hypervisor, we propagate the error back to the ioctl but leave the
vGIC vCPU data initialised. Note only does this leak the corresponding
memory when the vCPU is destroyed but it can also lead to use-after-free
if the redistributor device handling tries to walk into the vCPU.

Add the missing cleanup to kvm_arch_vcpu_create(), ensuring that the
vGIC vCPU structures are destroyed on error.

[ Fix ]

Backport fix commit from mainline:
- 250f25367b58d KVM: arm64: Tear down vGIC on failed vCPU creation

[ Test Plan ]

Compile tested only.

[ Regression Potential ]

The regression potential is minimal. The patch affects only arm64
error path when create_hyp_mappings() fails during vCPU creation.


Will Deacon (1):
  KVM: arm64: Tear down vGIC on failed vCPU creation

 arch/arm64/kvm/arm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

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2.51.0