---
id: CVE-2026-102702
title: |-
  [This CNA information record relates to multiple CVEs; the
  text explains which aspects/vulnerabilities correspond to which CVE.]

  1) XSA-437 (CVE-2023-34321) addressed issues with overflows in
     calculations involved in guests flushing …
summary: |-
  [This CNA information record relates to multiple CVEs; the
  text explains which aspects/vulnerabilities correspond to which CVE.]

  1) XSA-437 (CVE-2023-34321) addressed issues with overflows in
     calculations involved in guests flushing …
severity: high
published: '2026-10-13'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T16:10:14.750'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102702'
references:
  - url: 'https://xenbits.xenproject.org/xsa/advisory-519.html'
    label: security@xen.org
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-13T16:35:46.735Z'
vendor: Xen
product: Xen
affected:
  - Xen
epss: 0.00292
epssPercentile: 0.21601
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-20T17:27:31.334256Z'
cvssSource: adp
---

## Overview

[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]

1) XSA-437 (CVE-2023-34321) addressed issues with overflows in
   calculations involved in guests flushing caches through
   GNTTABOP_cache_flush.  Unfortunately the fix there introduced a
   calculation which may underflow, resulting in a loop which would - at
   least on 64-bit Arm - take excessively long, and which would likely
   eventually crash the hypervisor.

   This is CVE-2026-102699.

2) GNTTABOP_cache_flush may be issued on memory mapped from another
   domain using the grant table interface.  However there was no
   restriction to disallow the use of invalidate-without-clean against
   read-only grant mappings, which may corrupt the granted memory.

   This is CVE-2026-102702.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.