CVE-2026-98638
Received
Received - Intake
KVM: arm64 SVE Vector Length Validation Flaw
Vulnerability report for CVE-2026-98638, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-18
Last updated on: 2026-10-18
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: Validate the SVE vector length in pkvm_vcpu_init_sve()
pkvm_vcpu_init_sve() clamps only the upper bound of the host-provided
sve_max_vl, so an invalid vector length reaches sve_state_size_from_vl()
and the WARN_ON() there, which is fatal at EL2. The existing
!sve_state_size test rejects such a length, but only after the macro has
run.
Check sve_vl_valid() before deriving the state size. A valid length
cannot yield a zero size, so the !sve_state_size test goes with it.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | 5db1bef933427aa467ad89c7b695a84a6b4afe16 |
| Linux | Linux | 5db1bef933427aa467ad89c7b695a84a6b4afe16 |
| Linux | Linux | 5db1bef933427aa467ad89c7b695a84a6b4afe16 |
| Linux | Linux | 6.16 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
