RLSA-2026:74424 (CVE-2026-18917)

Vulnerability from osv_rocky – Published: 2026-10-03 12:04 – Updated: 2026-10-03 12:12 – Source website
VLAI
Summary
Important: libvirt security, bug fix, and enhancement update
Details

The libvirt library contains a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems. In addition, libvirt provides tools for remote management of virtualized systems.

Security Fix(es):

  • libvirt: swtpm privilege escalation via symlink following (CVE-2026-63622)

  • libvirt: Integer overflow in NodeGetFreePages RPC handler leading to heap buffer overflow (CVE-2026-18917)

Bug Fix(es) and Enhancement(s):

  • Live migration fails when virtio-vga becomes available, video device switches from virtio-gpu-pci to virtio-vga on target [rhel-9.8.z] (JIRA:Rocky Linux-186018)

  • libvirt-guests does not work together with virtlockd on shutdown [rhel-9.8.z] (JIRA:Rocky Linux-224986)

  • Expose guest-get-devices in libvirt-api [rhel-9.8.z] (JIRA:Rocky Linux-243306)

  • allow hyperv pvpanic "device" to process Windows crash dump [rhel-9.8.z] (JIRA:Rocky Linux-242549)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Credits
Rocky Enterprise Software Foundation
Red Hat
References
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:9",
        "name": "libvirt",
        "purl": "pkg:rpm/rocky-linux/libvirt?distro=rocky-linux-9\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "AppStream"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:11.10.0-12.7.el9_8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "database_specific": {
    "license": "CC-BY-4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "source_advisory": "RHSA-2026:74424"
  },
  "details": "The libvirt library contains a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems. In addition, libvirt provides tools for remote management of virtualized systems.\n\nSecurity Fix(es):\n\n* libvirt: swtpm privilege escalation via symlink following (CVE-2026-63622)\n\n* libvirt: Integer overflow in NodeGetFreePages RPC handler leading to heap buffer overflow (CVE-2026-18917)\n\nBug Fix(es) and Enhancement(s):\n\n* Live migration fails when virtio-vga becomes available, video device switches from virtio-gpu-pci to virtio-vga on target [rhel-9.8.z] (JIRA:Rocky Linux-186018)\n\n* libvirt-guests does not work together with virtlockd on shutdown [rhel-9.8.z] (JIRA:Rocky Linux-224986)\n\n* Expose guest-get-devices in libvirt-api [rhel-9.8.z] (JIRA:Rocky Linux-243306)\n\n* allow hyperv pvpanic \"device\" to process Windows crash dump [rhel-9.8.z] (JIRA:Rocky Linux-242549)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "id": "RLSA-2026:74424",
  "modified": "2026-10-03T12:12:07.022205Z",
  "published": "2026-10-03T12:04:21.220866Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:74424"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513065"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520161"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:74424"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Important: libvirt security, bug fix, and enhancement update",
  "upstream": [
    "CVE-2026-18917",
    "CVE-2026-63622"
  ]
}



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