CVE WatchOct 20, 2026

CVE-2026-102699

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] 1) XSA-437

CVSS

7.5

High

EPSS

0.3%

p21

KEV

—

Exploit Today

0-100

Published: Oct 13, 2026 · Last modified: Oct 20, 2026 · CWE-191

EPSS · 30d

0.1%EPSS · 30 days0.3%

2026-10-142026-10-22

Technical description

[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.

Official references

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

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