Vulnerability-Lookup

rlsa-2026:18326

Vulnerability from osv_rocky

Published

2026-05-29 16:03

Modified

2026-06-12 12:06

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 Rocky Linux 10 Release Notes linked from the References section.

Severity

5.5 (Medium)


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

Credits

Rocky Enterprise Software Foundation

Red Hat

References

URL

Type

	https://errata.rockylinux.org/RLSA-2026:18326	ADVISORY
	https://bugzilla.redhat.com/show_bug.cgi?id=2413801	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:10",
        "name": "libvirt",
        "purl": "pkg:rpm/rocky-linux/libvirt?distro=rocky-linux-10\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "AppStream"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:11.10.0-12.1.el10_2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "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\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 Rocky Linux 10 Release Notes linked from the References section.",
  "id": "RLSA-2026:18326",
  "modified": "2026-06-12T12:06:09.419733Z",
  "published": "2026-05-29T16:03:24.060458Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:18326"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2413801"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Moderate: libvirt security update",
  "upstream": [
    "CVE-2025-12748"
  ]
}

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 (v2.0.3)

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

redhat

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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                  },
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-11-12T14:40:15.451605Z",
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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.

Action not permitted

rlsa-2026:18326

Vulnerability from osv_rocky

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

Tags

Sightings

Nomenclature