CVE-2026-18917— Libvirt: integer overflow in nodegetfreepages rpc handler leading to heap buffer overflow
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 10
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.
libvirt是libvirt组织开源的一个虚拟化管理工具。 libvirt存在数字错误漏洞，该漏洞源于NodeGetFreePages RPC处理器中的整数溢出漏洞，可导致特制值绕过大小检查，产生过小的内存缓冲区，真实NUMA节点数据可能覆盖该缓冲区，造成堆缓冲区溢出，破坏root libvirt守护进程内存，可能导致拒绝服务或本地权限提升。
Possible ATT&CK Techniques 3 AI
T1499 · Endpoint Denial of Service T1055 · Process Injection T1068 · Exploitation for Privilege EscalationAffected Version Matrix 16
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I. Basic Information for CVE-2026-18917
Vulnerability Information
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Vulnerability Title
Libvirt: integer overflow in nodegetfreepages rpc handler leading to heap buffer overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
libvirt 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libvirt是libvirt组织开源的一个虚拟化管理工具。 libvirt存在数字错误漏洞，该漏洞源于NodeGetFreePages RPC处理器中的整数溢出漏洞，可导致特制值绕过大小检查，产生过小的内存缓冲区，真实NUMA节点数据可能覆盖该缓冲区，造成堆缓冲区溢出，破坏root libvirt守护进程内存，可能导致拒绝服务或本地权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | 0:11.10.0-12.9.el10_2 ~ * |
cpe:/o:redhat:enterprise_linux:10.2
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| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | 0:10.10.0-8.12.el10_0 ~ * |
cpe:/o:redhat:enterprise_linux_eus:10.0
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| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | 0:4.5.0-36.el7_9.7 ~ * |
cpe:/o:redhat:rhel_els:7
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| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | 8040020260916092751.522a0ee4 ~ * |
cpe:/a:redhat:rhel_aus:8.4::appstream
|
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| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | 8040020260916092751.522a0ee4 ~ * |
cpe:/a:redhat:rhel_aus:8.4::appstream
|
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| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | 8060020260910092451.ad008a3a ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
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| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | 8060020260910092451.ad008a3a ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | 8080020260910092120.63b34585 ~ * |
cpe:/a:redhat:rhel_e4s:8.8::appstream
|
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| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | 8080020260910092120.63b34585 ~ * |
cpe:/a:redhat:rhel_e4s:8.8::appstream
|
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| Red Hat | Red Hat Enterprise Linux 9 | 0:11.10.0-12.7.el9_8 ~ * |
cpe:/a:redhat:enterprise_linux:9::appstream
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| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | 0:9.0.0-10.17.el9_2 ~ * |
cpe:/a:redhat:rhel_e4s:9.2::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | 0:10.0.0-6.24.el9_4 ~ * |
cpe:/a:redhat:rhel_e4s:9.4::appstream
|
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| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | 0:10.10.0-7.19.el9_6 ~ * |
cpe:/a:redhat:rhel_eus:9.6::appstream
|
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| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
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| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux for NVIDIA 26 | - |
cpe:/a:redhat:enterprise_linux_nvidia:
|
|
II. Public POCs for CVE-2026-18917
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-18917 (12)
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🔗 RHSA-2026:75583 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
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Same Patch Batch · Red Hat · 2026-08-20 · 15 CVEs total
| CVE-2026-67567 | 9.9 CRITICAL | Multicloud-operators-subscription: multicloud-operators-subscription: helmrelease chart ap |
| CVE-2026-11861 | 9.6 CRITICAL | Freeipa: idm: ipa: freeipa: obtaining tgs with impersonating cname through trust relations |
| CVE-2026-13097 | 8.7 HIGH | Ipa: privilege escalation via krbcanonicalname manipulation due to realm-unaware uniquenes |
| CVE-2026-77176 | 8.1 HIGH | Kata-containers: insufficient validation of createcontainer mount and storage rules in gen |
| CVE-2026-73137 | 7.7 HIGH | Multicloud-operators-subscription: multicloud-operators-subscription: cross-namespace secr |
| CVE-2026-73197 | 7.5 HIGH | Ipa: freeipa: unauthenticated dos in `/ipa/migration/migration.py` via unbounded request b |
| CVE-2026-73198 | 7.5 HIGH | Ipa: freeipa: unauthenticated dos in `/ipa/i18n_messages` via unbounded request body read |
| CVE-2026-19611 | 7.4 HIGH | Wildfly-elytron: org.wildfly.security/wildfly-elytron-password-impl: wildfly-elytron: pass |
| CVE-2026-73199 | 6.5 MEDIUM | Ipa: freeipa: null pointer dereference in `ipa-enrollment` extended operation (`join_oid`) |
| CVE-2026-66787 | 5.4 MEDIUM | Lighthouse: go pprof profiling endpoint enabled unconditionally on lighthouse-agent :8082 |
| CVE-2026-77014 | 5.3 MEDIUM | Libsoup: libsoup: integer truncation in sort_ranges() comparator causes silent omission of |
| CVE-2026-73196 | 4.3 MEDIUM | Ipa: freeipa: authenticated dos in `otptoken-add` via unbounded otp key decoding/re-encodi |
| CVE-2026-66788 | 3.7 LOW | Lighthouse: dockerfile build stages use end-of-life fedora 40 referenced by mutable tag |
| CVE-2026-66785 | 2.5 LOW | Submariner: ipsec psk secrets file created with default world-readable permissions |
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V. Comments for CVE-2026-18917
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