Hypervisor Crash Vulnerability in Xen Project Software
CVE-2026-102699

7.5HIGH

Key Information:

Vendor

Xen Project
Status
Xen Project
Vendor
CVE Published:
13 October 2026

What is CVE-2026-102699?

A vulnerability in the Xen Hypervisor allows for potential system crashes due to an issue in cache flushing operations. The flaw arises from a calculation underflow triggered in certain scenarios, particularly affecting 64-bit Arm architectures. This error may cause an infinite loop during memory operations, leading to degraded performance and eventual crashes of the hypervisor. Additionally, related safeguards are absent for read-only grant mappings during cache flush, risking memory corruption. Administrators and users are advised to seek updates and apply security patches promptly.

Affected Version(s)

Xen consult Xen advisory XSA-519

References

https://xenbits.xenproject.org/xsa/advisory-519.html

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

CVE-2026-102699 was discovered by Leonid Komarianskyi of EPAM. It was later independently reported by Ayan Kumar Halder of AMD. CVE-2026-102702 was found by the security team while looking at the surrounding code.
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