A guest can send checksum metadata the host kernel trusts without checking, and read host memory back. The flaw is in the host's IPv4 stack, which means the tenant cannot fix it and the provider has to.
1 article — 2026-10-17
NOT IN CISA KEV — CATALOG 2026.10.16
Authoritative record
Root Notes reports on this identifier; it does not maintain it. For the vendor advisory, the affected versions and the scoring, NVD and MITRE hold the primary records.
Not listed in CISA's Known Exploited Vulnerabilities catalog as of catalog 2026.10.16. That is not evidence it is not being exploited — the catalog records what CISA has confirmed, and identifiers have been attacked for days before appearing in it.
A guest can send checksum metadata the host kernel trusts without checking, and read host memory back. The flaw is in the host's IPv4 stack, which means the tenant cannot fix it and the provider has to.