Riskcovery

CVE-2026-98928

KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2

State
Published
Severity
Not scored
Published
Oct 23, 2026
Updated
Oct 23, 2026
Reserved
Sep 25, 2026

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 41d6028e28bd474298ff10409c292ec46cf43a90 to before 4efda204087145d40a84344edec7e9d3885ad3abAffected
  • 41d6028e28bd474298ff10409c292ec46cf43a90 to before 7b5e99d286747b6b5b583b8efcd06bdbdd94b229Affected
  • 41d6028e28bd474298ff10409c292ec46cf43a90 to before 4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5Affected
LinuxLinux
  • 6.14Affected
  • before 6.14Not affected
  • 6.18.55 through 6.18.*Not affected
  • 7.2.9 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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