Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且廠商未提供可用的修補程式。

  - 在 libvirt 中發現一個缺陷。無特權的本機使用者可能會利用 NodeGetFreePages RPC 處理常式中的整數溢位弱點。此缺陷允許特製的值繞過大小檢查，從而導致記憶體緩衝區過小。隨後，實際的 NUMA 節點資料可以覆寫此緩衝區。此堆積緩衝區溢位可能會損毀根 libvirt 精靈的記憶體，進而可能導致拒絕服務或本機權限提升。（CVE-2026-18917）

請注意，Nessus 的判定取決於廠商所報告的套件是否存在。

Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - 在 libvirt 中发现一个缺陷。非特权本地用户可利用 NodeGetFreePages RPC 处理程序中的整数溢出漏洞。此缺陷允许构建的值绕过大小检查，从而导致内存缓冲区过小。因此，真正的 NUMA 节点数据可覆盖此缓冲区。此堆缓冲区溢出可损坏根 libvirt 后台程序的内存，从而可能导致拒绝服务或本地权限升级。（CVE-2026-18917）

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

Linux/Unix ホストには、ベンダーが提供するパッチが利用できない脆弱性の影響を受ける複数のパッケージがインストールされています。

  - libvirt にメモリ解放後使用 (Use After Free) の欠陥が見つかりました。権限のないローカルユーザーが、NodeGetFreePages RPCハンドラーの整数オーバーフローの脆弱性を悪用する可能性があります。この欠陥により、細工された値がサイズチェックをバイパスし、メモリバッファのサイズが小さくなる可能性があります。その後、本当の NUMA ノードデータがこのバッファを上書きする可能性があります。このヒープバッファオーバーフローにより、root libvirt デーモンのメモリが破損し、サービス拒否やローカルの権限昇格が引き起こされる可能性があります。(CVE-2026-18917)

Nessus は、ベンダーから報告されたパッケージの存在に依存していることに注意してください。

The version of libvirt installed on the remote host is prior to 4.5.0-36. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3910 advisory.

    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. (CVE-2026-18917)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-106766 advisory.

    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.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-18917)

Note that Nessus relies on the presence of the package as reported by the vendor.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-2139 advisory.

    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. (CVE-2026-18917)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
338287	Linux Distros 未修補弱點：CVE-2026-18917	Nessus	Misc.	8/20/2026	8/27/2026	high
338287	Linux Distros 未修补的漏洞：CVE-2026-18917	Nessus	Misc.	8/20/2026	8/27/2026	high
338287	Linux Distros のパッチ未適用の脆弱性: CVE-2026-18917	Nessus	Misc.	8/20/2026	8/27/2026	high
345778	Amazon Linux 2 : libvirt (ALAS-2026-3910)	Nessus	Amazon Linux Local Security Checks	9/14/2026	9/14/2026	high
344438	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: libvirt (UTSA-2026-106766)	Nessus	Unity Linux Local Security Checks	9/9/2026	9/9/2026	high
338287	Linux Distros Unpatched Vulnerability : CVE-2026-18917	Nessus	Misc.	8/20/2026	8/27/2026	high
345790	Amazon Linux 2023 : libvirt, libvirt-client, libvirt-client-qemu (ALAS2023-2026-2139)	Nessus	Amazon Linux Local Security Checks	9/14/2026	9/14/2026	high

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