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

Vulnerability from osv_almalinux – Published: 2026-10-01 00:00 – Updated: 2026-10-05 10:42 – 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 [almalinux-9.8.z] (JIRA:AlmaLinux-186018)
  • libvirt-guests does not work together with virtlockd on shutdown [almalinux-9.8.z] (JIRA:AlmaLinux-224986)
  • Expose guest-get-devices in libvirt-api [almalinux-9.8.z] (JIRA:AlmaLinux-243306)
  • allow hyperv pvpanic "device" to process Windows crash dump [almalinux-9.8.z] (JIRA:AlmaLinux-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.

References
To clipboard 

{
  "affected": [
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        "ecosystem": "AlmaLinux:9",
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          "type": "ECOSYSTEM"
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      "package": {
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          "type": "ECOSYSTEM"
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          "type": "ECOSYSTEM"
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      "package": {
        "ecosystem": "AlmaLinux:9",
        "name": "libvirt-nss"
      },
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          "type": "ECOSYSTEM"
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    {
      "package": {
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        "name": "libvirt-ssh-proxy"
      },
      "ranges": [
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          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "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  * libvirt: Integer overflow in NodeGetFreePages RPC handler leading to heap buffer overflow (CVE-2026-18917)\n\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 [almalinux-9.8.z] (JIRA:AlmaLinux-186018)\n  * libvirt-guests does not work together with virtlockd on shutdown [almalinux-9.8.z] (JIRA:AlmaLinux-224986)\n  * Expose guest-get-devices in libvirt-api [almalinux-9.8.z] (JIRA:AlmaLinux-243306)\n  * allow hyperv pvpanic \"device\" to process Windows crash dump [almalinux-9.8.z] (JIRA:AlmaLinux-242549)\n\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.\n",
  "id": "ALSA-2026:74424",
  "modified": "2026-10-05T10:42:25Z",
  "published": "2026-10-01T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:74424"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-18917"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-63622"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2513065"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2520161"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/9/ALSA-2026-74424.html"
    }
  ],
  "related": [
    "CVE-2026-18917",
    "CVE-2026-63622"
  ],
  "schema_version": "1.7.0",
  "summary": "Important: libvirt security, bug fix, and enhancement update",
  "upstream": [
    "CVE-2026-18917",
    "CVE-2026-63622"
  ]
}



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