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CVE-2026-102699— Arm: multiple issues with GNTTABOP_cache_flush

Quick assessment

Affected
Xen Xen
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

[该 CNA（CVE 授权机构）信息记录涉及多个 CVE；下文解释了哪些漏洞方面/漏洞对应于哪个 CVE。] 1) XSA-437（CVE-2023-34321）解决了通过 GNTTABOP_cache_flush 操作使客户机刷新缓存时，相关计算中存在的溢出问题。不幸的是，该修复引入了可能导致下溢的计算，从而引发一个循环。至少在 64 位 Arm 平台上，该循环会消耗极长时间，并最终可能导致宿主机（hypervisor）崩溃。 此漏洞对应 CVE-2026-102699。 2) GNTTABOP_cache_fl

AI Predicted 5.3 Difficulty: Moderate EPSS 0.15% · P3

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-519 unknown
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I. Basic Information for CVE-2026-102699

Vulnerability Information
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Vulnerability Title
Arm: multiple issues with GNTTABOP_cache_flush
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xen Xen consult Xen advisory XSA-519 -

II. Public POCs for CVE-2026-102699

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III. Intelligence Information for CVE-2026-102699

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Vendor Advisories for CVE-2026-102699 (1)

Same Patch Batch · Xen · 2026-10-13 · 8 CVEs total

CVE-2026-102700 gnttab: cache-flush handling may cause page reference leak
CVE-2026-102702 Arm: multiple issues with GNTTABOP_cache_flush
CVE-2026-79607 Xenstore: Guests can crash xenstored during Live Update
CVE-2026-79611 VMX: VMentry failure with branch tracing and blocked states
CVE-2026-79609 x86: XPTI may break on huge-memory systems
CVE-2026-79610 grant-table: double version change race
CVE-2026-79608 x86/AMD: ineffectual Zenbleed workaround

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-102699

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