Unknown severity · Source severity not reportedCVE-2026-98928

KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2CVE-2026-98928

Answer in brief

CVE-2026-98928 records a Unknown severity vulnerability in KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 23, 2026Updated Oct 23, 2026Source checked Oct 25, 2026First seen by HOL Oct 23, 2026Material review Oct 23, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=41d6028e28bd474298ff10409c292ec46cf43a90 <4efda204087145d40a84344edec7e9d3885ad3ab \|\| >=41d6028e28bd474298ff10409c292ec46cf43a90 <7b5e99d286747b6b5b583b8efcd06bdbdd94b229 \|\| >=41d6028e28bd474298ff10409c292ec46cf43a90 <4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5	4efda204087145d40a84344edec7e9d3885ad3ab, 7b5e99d286747b6b5b583b8efcd06bdbdd94b229, 4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5
Linux/Linuxgeneric	6.14	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 4efda204087145d40a84344edec7e9d3885ad3ab if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 23, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.