GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

OESA-2026-3832 (CVE-2026-18917)

Vulnerability from osv_openeuler – Published: 2026-09-14 16:34 – Updated: 2026-09-14 16:34 – Source website
VLAI
Summary
libvirt security update
Details

Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). The main package includes the libvirtd server exporting the virtualization support.

Security Fix(es):

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)

An injection vulnerability was found in libvirt's virtual network driver. The network XML parser does not strip newline characters from DNS TXT record value attributes and SRV record domain/target attributes. These values are written verbatim into the dnsmasq configuration file generated by the network driver, allowing a user with permission to define virtual networks to inject arbitrary dnsmasq configuration directives such as dhcp-script, leading to arbitrary command execution as root.(CVE-2026-61477)

A flaw was found in libvirt. A local attacker, specifically a process running as the confined swtpm user, could exploit a symlink-following vulnerability in the virFileChownFiles() function. By planting a symbolic link within the swtpm state directory, the attacker could trick the root-level libvirt daemon into changing the ownership of an arbitrary file to the swtpm user. This allows for privilege escalation from the swtpm sandbox to root-level file ownership control.(CVE-2026-63622)

A flaw was found in libvirt. During storage volume clone or convert operations, newly created volume images were temporarily world-readable. This was caused by the qemu-img utility running with overly permissive file creation settings, allowing any local user to read the full guest disk contents. This vulnerability could lead to sensitive information disclosure from guest virtual machines.(CVE-2026-63623)

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libvirt-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-client-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-common-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-config-network-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-config-nwfilter-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-interface-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-network-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-nodedev-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-nwfilter-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-qemu-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-secret-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-storage-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-storage-core-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-storage-disk-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-storage-gluster-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-storage-iscsi-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-storage-iscsi-direct-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-storage-logical-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-storage-mpath-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-storage-rbd-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-driver-storage-scsi-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-kvm-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-lock-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-log-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-plugin-lockd-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-plugin-sanlock-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-proxy-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-daemon-qemu-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-debuginfo-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-debugsource-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-devel-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-docs-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-libs-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-nss-9.10.0-37.oe2403sp4.aarch64.rpm",
          "libvirt-wireshark-9.10.0-37.oe2403sp4.aarch64.rpm"
        ],
        "src": [
          "libvirt-9.10.0-37.oe2403sp4.src.rpm"
        ],
        "x86_64": [
          "libvirt-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-client-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-common-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-config-network-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-config-nwfilter-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-interface-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-network-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-nodedev-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-nwfilter-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-qemu-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-secret-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-storage-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-storage-core-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-storage-disk-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-storage-gluster-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-storage-iscsi-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-storage-iscsi-direct-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-storage-logical-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-storage-mpath-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-storage-rbd-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-driver-storage-scsi-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-kvm-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-lock-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-log-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-plugin-lockd-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-plugin-sanlock-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-proxy-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-daemon-qemu-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-debuginfo-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-debugsource-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-devel-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-docs-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-libs-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-nss-9.10.0-37.oe2403sp4.x86_64.rpm",
          "libvirt-wireshark-9.10.0-37.oe2403sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP4",
        "name": "libvirt",
        "purl": "pkg:rpm/openEuler/libvirt\u0026distro=openEuler-24.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.10.0-37.oe2403sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). The main package includes the libvirtd server exporting the virtualization support.\r\n\r\nSecurity Fix(es):\n\nA 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\u0026apos;s memory, potentially leading to a denial of service or local privilege escalation.(CVE-2026-18917)\n\nAn injection vulnerability was found in libvirt\u0026apos;s virtual network driver. The network XML parser does not strip newline characters from DNS TXT record value attributes and SRV record domain/target attributes. These values are written verbatim into the dnsmasq configuration file generated by the network driver, allowing a user with permission to define virtual networks to inject arbitrary dnsmasq configuration directives such as dhcp-script, leading to arbitrary command execution as root.(CVE-2026-61477)\n\nA flaw was found in libvirt. A local attacker, specifically a process running as the confined `swtpm` user, could exploit a symlink-following vulnerability in the `virFileChownFiles()` function. By planting a symbolic link within the `swtpm` state directory, the attacker could trick the root-level libvirt daemon into changing the ownership of an arbitrary file to the `swtpm` user. This allows for privilege escalation from the `swtpm` sandbox to root-level file ownership control.(CVE-2026-63622)\n\nA flaw was found in libvirt. During storage volume clone or convert operations, newly created volume images were temporarily world-readable. This was caused by the `qemu-img` utility running with overly permissive file creation settings, allowing any local user to read the full guest disk contents. This vulnerability could lead to sensitive information disclosure from guest virtual machines.(CVE-2026-63623)",
  "id": "OESA-2026-3832",
  "modified": "2026-09-14T16:34:48Z",
  "published": "2026-09-14T16:34:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3832"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18917"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61477"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63622"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63623"
    }
  ],
  "schema_version": "1.7.2",
  "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": "libvirt security update",
  "upstream": [
    "CVE-2026-18917",
    "CVE-2026-61477",
    "CVE-2026-63622",
    "CVE-2026-63623"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.