KVM: arm64: Do not clear VM-wide SVE feature on vCPU init failure

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Summary

CVECVE-2026-98637
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:16 UTC
Updated2026-10-19 10:19:27 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Do not clear VM-wide SVE feature on vCPU init failure pkvm_vcpu_init_sve() clears KVM_ARM_VCPU_SVE in kvm->arch.vcpu_features when it fails, but vcpu_has_sve() tests KVM_ARCH_FLAG_GUEST_HAS_SVE, which is left set. Later vCPUs on that VM then skip the SVE setup and register with a NULL sve_state, which the guest's first FP access hands to sve_load_state(). Return the error without touching vcpu_features.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5db1bef933427aa467ad89c7b695a84a6b4afe16 bd46b41f412fb81c50bac1a0929ec31320f3a807 git Not specified
CNA Linux Linux affected 5db1bef933427aa467ad89c7b695a84a6b4afe16 f0cd8ffae092cc1b9d7cfa9188ed5a88a374adcb git Not specified
CNA Linux Linux affected 5db1bef933427aa467ad89c7b695a84a6b4afe16 a1b3c788ad31837e348075e93dbba3f447492776 git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a1b3c788ad31837e348075e93dbba3f447492776 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd46b41f412fb81c50bac1a0929ec31320f3a807 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f0cd8ffae092cc1b9d7cfa9188ed5a88a374adcb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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