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.

Project Subscriptions

Vendors Products
Enterprise Linux Subscribe
Enterprise Linux Nvidia Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

Restrict access to the libvirt read-only Unix socket to limit which local users can reach the vulnerable RPC handler. In /etc/libvirt/libvirtd.conf, set unix_sock_ro_perms to "0770" (or "0700") and configure unix_sock_group to a group containing only trusted users. Alternatively, enable polkit authentication for the read-only socket by setting auth_unix_ro = "polkit", which requires callers to be authorized before any RPC dispatch occurs. After changing the configuration, restart the libvirtd service. Note: restricting socket access may prevent unprivileged monitoring tools or read-only management clients from connecting.

History

Thu, 20 Aug 2026 10:15:00 +0000

Type Values Removed Values Added
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.
Title Libvirt: integer overflow in nodegetfreepages rpc handler leading to heap buffer overflow
First Time appeared Redhat
Redhat enterprise Linux
Redhat enterprise Linux Nvidia
Weaknesses CWE-190
CPEs cpe:/a:redhat:enterprise_linux_nvidia:
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat enterprise Linux Nvidia
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-20T15:36:10.363Z

Reserved: 2026-08-05T07:41:23.966Z

Link: CVE-2026-18917

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-20T10:16:40.507

Modified: 2026-08-20T16:17:17.847

Link: CVE-2026-18917

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T21:30:05Z

Weaknesses