CVE-2026-102699

UNKNOWN 0.0

Arm: multiple issues with GNTTABOP_cache_flush

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

[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.

Vendor	xen
Product	xen
Published	Oct 13, 2026

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Affected Versions

Xen / Xen

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

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.