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

CVE-2026-102702 is fixed in xen on 1 platform, first by DEBIAN-CVE-2026-102702, released October 19, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-102702
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 13, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.17.7+13-g2445b30a44-0+deb12u1 | [DEBIAN-CVE-2026-102702](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102702.md) | Oct 19, 2026 |
| Linux | xen Debian 13.5 (trixie) | 4.20.4+39-gf1e1321c87-0+deb13u1 | [DEBIAN-CVE-2026-102702](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102702.md) | Oct 19, 2026 |
| Linux | xen Debian 14 | 4.20.4+39-gf1e1321c87-1 | [DEBIAN-CVE-2026-102702](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102702.md) | Oct 19, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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