Vulnerability-Lookup

ALSA-2026:18748

Vulnerability from osv_almalinux – Published: 2026-05-19 00:00 – Updated: 2026-05-26 12:35 – Source website

Summary

Moderate: libvirt security update

Details

Kernel-based Virtual Machine (KVM) offers a full virtualization solution forLinux on numerous hardware platforms. The virt:rhel module contains packageswhich provide user-space components used to run virtual machines using KVM.The packages also provide APIs for managing and interacting with the virtualized systems.

Security Fix(es):

libvirt: Denial of service in XML parsing (CVE-2025-12748)

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.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinuxRelease Notes linked from the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:18748	ADVISORY
	https://access.redhat.com/security/cve/CVE-2025-12748	REPORT
	https://bugzilla.redhat.com/2413801	REPORT
	https://errata.almalinux.org/9/ALSA-2026-18748.html	ADVISORY

JSON

To clipboard

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  "details": "Kernel-based Virtual Machine (KVM) offers a full virtualization solution forLinux on numerous hardware platforms. The virt:rhel module contains packageswhich provide user-space components used to run virtual machines using KVM.The packages also provide APIs for managing and interacting with the virtualized systems.  \n\nSecurity Fix(es):  \n\n  * libvirt: Denial of service in XML parsing (CVE-2025-12748)\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\nAdditional Changes:  \n\nFor detailed information on changes in this release, see the AlmaLinuxRelease Notes linked from the References section.\n",
  "id": "ALSA-2026:18748",
  "modified": "2026-05-26T12:35:09Z",
  "published": "2026-05-19T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:18748"
    },
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      "url": "https://access.redhat.com/security/cve/CVE-2025-12748"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2413801"
    },
    {
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      "url": "https://errata.almalinux.org/9/ALSA-2026-18748.html"
    }
  ],
  "related": [
    "CVE-2025-12748"
  ],
  "summary": "Moderate: libvirt security update"
}

CVE-2025-12748 (GCVE-0-2025-12748)

Vulnerability from cvelistv5 – Published: 2025-11-11 19:49 – Updated: 2026-06-29 23:29

Title

Libvirt: denial of service in xml parsing

Summary

A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user provided XML files was performed before the ACL checks. A malicious user with limited permissions could exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting in a denial-of-service condition.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-11-12 14:40 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

redhat redhat root

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:18326	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18748	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2025-12748	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2413801	issue-trackingx_refsource_REDHAT

Impacted products

6 products

Vendor	Product	Version
		Affected: 0 , ≤ 11.9.0 (semver)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:11.10.0-12.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:11.10.0-12.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8

Date Public

2025-11-07 00:00

Credits

Red Hat would like to thank Artem Mukhin and Святослав Терешин for reporting this issue.

Show details on NVD website

JSON

To clipboard

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            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:18326"
        },
        {
          "name": "RHSA-2026:18748",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:18748"
        },
        {
          "tags": [
            "vdb-entry",
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          ],
          "url": "https://access.redhat.com/security/cve/CVE-2025-12748"
        },
        {
          "name": "RHBZ#2413801",
          "tags": [
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            "x_refsource_REDHAT"
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2413801"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2025-11-10T15:19:36.251Z",
          "value": "Reported to Red Hat."
        },
        {
          "lang": "en",
          "time": "2025-11-07T00:00:00.000Z",
          "value": "Made public."
        }
      ],
      "title": "Libvirt: denial of service in xml parsing",
      "workarounds": [
        {
          "lang": "en",
          "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_redhatCweChain": "CWE-770: Allocation of Resources Without Limits or Throttling"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2025-12748",
    "datePublished": "2025-11-11T19:49:32.255Z",
    "dateReserved": "2025-11-05T14:52:13.619Z",
    "dateUpdated": "2026-06-29T23:29:05.055Z",
    "state": "PUBLISHED"
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}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.