# CVE-2026-18917

## Summary

- **CVE ID:** CVE-2026-18917
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-190
- **Published:** Aug 20, 2026
- **Last Modified:** Sep 17, 2026

## Description

A flaw was found in libvirt. An unprivileged local user could exploit an integer overflow vulnerability in the NodeGetFreePages RPC handler. This flaw allows crafted values to bypass a size check, leading to an undersized memory buffer. Subsequently, real NUMA node data can overwrite this buffer. This heap buffer overflow can corrupt the root libvirt daemon's memory, potentially leading to a denial of service or local privilege escalation.

## Affected Products

- Red Hat — Red Hat Enterprise Linux 10.0 Extended Update Support (0:10.10.0-8.12.el10_0)
- Red Hat — Red Hat Enterprise Linux 8.8 Telecommunications Update Service (8080020260910092120.63b34585)
- Red Hat — Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (8080020260910092120.63b34585)
- Red Hat — Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (0:9.0.0-10.17.el9_2)
- Red Hat — Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions (0:10.0.0-6.24.el9_4)
- Red Hat — Red Hat Enterprise Linux 9.6 Extended Update Support (0:10.10.0-7.19.el9_6)
- Red Hat — Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (8060020260910092451.ad008a3a)
- Red Hat — Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (8060020260910092451.ad008a3a)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-18917)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2520161)
- [CNA](https://access.redhat.com/errata/RHSA-2026:68509)
- [CNA](https://access.redhat.com/errata/RHSA-2026:68510)
- [CNA](https://access.redhat.com/errata/RHSA-2026:68511)
- [CNA](https://access.redhat.com/errata/RHSA-2026:68513)
- [CNA](https://access.redhat.com/errata/RHSA-2026:68514)
- [CNA](https://access.redhat.com/errata/RHSA-2026:68594)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 6.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._