CVE-2026-98928 KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-98928?
CVE-2026-98928 is a vulnerability in Linux, published on 23 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2
pkvm_init_features_from_host() takes KVM_ARCH_FLAG_GUEST_HAS_SVE and KVM_ARM_VCPU_SVE from the host separately, but pkvm_vcpu_init_sve() tests the bit while vcpu_has_sve() reads the flag. A host that sets the flag without the bit gets a vCPU with a NULL sve_state that the world switch loads the guest's SVE state from.
Derive the flag from the bit, and drop the protected path's copy of the host's flag, which is dead code since protected VMs are not allowed SVE.
Which versions are affected by CVE-2026-98928?
How do I fix CVE-2026-98928?
Upgrade to a fixed version.
Is CVE-2026-98928 being exploited?
There is no known exploitation of CVE-2026-98928 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98928, DEBIAN-CVE-2026-98928, GHSA-vj8p-cgf2-cww7, UBUNTU-CVE-2026-98928.