CVE
CVE-2026-102703
Xen · Xen
- First Reported
- Nov 4, 2026
- Latest Reported
- Nov 4, 2026
CVE Enrichment
- CISA KEV
- Not listed
Description
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] A common access pattern is a batch of Grant Copy operations acting on adjacent address ranges in the same source or destination page. For performance reasons, Xen caches details internally to reuse already validated data. The conditions on when to re-validate the internal data were not correct in some cases: - Frame numbers and grant references could wrongly be mixed up. This is CVE-2026-102703. - Copying by frame number (rather than grant reference) is permitted only when operating on the caller's own memory. The check to enforce this restriction was misplaced. This is CVE-2026-102704.
Technical Details
- CNA / NVD Source
- [email protected]
- Published
- 04-Nov-2026 18:17
- Last Modified
- 04-Nov-2026 18:17
CNA Products / Version Status
- Xen · Xen
Source: CNA · [email protected]
Default status: unknown
consult Xen advisory XSA-523 — unknown
References
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.
Reported Context (1)
- All Xen versions from 4.6 onward are vulnerable, while 4.5 and earlier are not. The flaws are tracked as CVE-2026-102703 and CVE-2026-102704, under Xen advisory XSA-523. Xen Flaws Let Malicious VMs Read and Write Other VMs’ Memory
CVE (1)
People (1)
MITRE ATT&CK (1)
Vendors (1)
Products (4)
Tools (1)
Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.