CVE-2026-98928
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.
How to fix
- Linux Linux4efda204087145d40a84344edec7e9d3885ad3ab, 7b5e99d286747b6b5b583b8efcd06bdbdd94b229, 4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 41d6028e28bd474298ff10409c292ec46cf43a90 ≤ v < 4efda204087145d40a84344edec7e9d3885ad3ab, 41d6028e28bd474298ff10409c292ec46cf43a90 ≤ v < 7b5e99d286747b6b5b583b8efcd06bdbdd94b229, 41d6028e28bd474298ff10409c292ec46cf43a90 ≤ v < 4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5, 6.14 | 4efda204087145d40a84344edec7e9d3885ad3ab, 7b5e99d286747b6b5b583b8efcd06bdbdd94b229, 4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5 |
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