CVE-2026-98638
- Source
- https://cve.org/CVERecord?id=CVE-2026-98638
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98638.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-98638
- Downstream
- Published
- 2026-10-18T15:20:09Z
- Modified
- 2026-10-20T02:30:20Z
- Summary
- KVM: arm64: Validate the SVE vector length in pkvm_vcpu_init_sve()
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98638.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/2a2eb10795a1e495aebc7f829ccecb72c05b4fd9
- https://git.kernel.org/stable/c/bae3e4493046de4fefa15f809d9b8dc114e84a3d
- https://git.kernel.org/stable/c/faf66e55e87498ab4bf88cdf9a629e61b3f2d3bc
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98638.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-98638