Vulnerability-Lookup

alsa-2026:1831

Vulnerability from osv_almalinux

Published

2026-02-03 00:00

Modified

2026-02-06 17:34

Summary

Moderate: qemu-kvm security update

Details

Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM.

Security Fix(es):

qemu-kvm: VNC WebSocket handshake use-after-free (CVE-2025-11234)

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.

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:10",
        "name": "qemu-guest-agent"
      },
      "ranges": [
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          "type": "ECOSYSTEM"
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          "type": "ECOSYSTEM"
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      ]
    },
    {
      "package": {
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        "name": "qemu-kvm-audio-pa"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:10",
        "name": "qemu-kvm-block-blkio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "18:10.0.0-14.el10_1.5.alma.1"
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          ],
          "type": "ECOSYSTEM"
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      ]
    },
    {
      "package": {
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      },
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:10",
        "name": "qemu-kvm-block-rbd"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "18:10.0.0-14.el10_1.5.alma.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:10",
        "name": "qemu-kvm-common"
      },
      "ranges": [
        {
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            {
              "introduced": "0"
            },
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            }
          ],
          "type": "ECOSYSTEM"
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    },
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      "package": {
        "ecosystem": "AlmaLinux:10",
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      },
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    },
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      "package": {
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      },
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            }
          ],
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        "name": "qemu-kvm-docs"
      },
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            }
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          "type": "ECOSYSTEM"
        }
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      "package": {
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        "name": "qemu-kvm-ui-egl-headless"
      },
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              "fixed": "18:10.0.0-14.el10_1.5.alma.1"
            }
          ],
          "type": "ECOSYSTEM"
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      "package": {
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        "name": "qemu-kvm-ui-opengl"
      },
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:10",
        "name": "qemu-pr-helper"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "18:10.0.0-14.el10_1.5.alma.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM.  \n\nSecurity Fix(es):  \n\n  * qemu-kvm: VNC WebSocket handshake use-after-free (CVE-2025-11234)\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-2026:1831",
  "modified": "2026-02-06T17:34:44Z",
  "published": "2026-02-03T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:1831"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2025-11234"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2401209"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/10/ALSA-2026-1831.html"
    }
  ],
  "related": [
    "CVE-2025-11234"
  ],
  "summary": "Moderate: qemu-kvm security update"
}

CVE-2025-11234 (GCVE-0-2025-11234)

Vulnerability from cvelistv5 – Published: 2025-10-03 10:30 – Updated: 2026-02-24 10:13

Title

Qemu-kvm: vnc websocket handshake use-after-free

Summary

A flaw was found in QEMU. If the QIOChannelWebsock object is freed while it is waiting to complete a handshake, a GSource is leaked. This can lead to the callback firing later on and triggering a use-after-free in the use of the channel. This can be abused by a malicious client with network access to the VNC WebSocket port to cause a denial of service during the WebSocket handshake prior to the VNC client authentication.

Severity ?

7.5 (High)


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

CWE

CWE-416 - Use After Free

Assigner

redhat

References

URL

Tags

	https://access.redhat.com/errata/RHSA-2025:23228	vendor-advisoryx_refsource_REDHAT
	https://access.redhat.com/errata/RHSA-2026:0326	vendor-advisoryx_refsource_REDHAT
	https://access.redhat.com/errata/RHSA-2026:0332	vendor-advisoryx_refsource_REDHAT
	https://access.redhat.com/errata/RHSA-2026:0702	vendor-advisoryx_refsource_REDHAT
	https://access.redhat.com/errata/RHSA-2026:1831	vendor-advisoryx_refsource_REDHAT
	https://access.redhat.com/errata/RHSA-2026:3077	vendor-advisoryx_refsource_REDHAT
	https://access.redhat.com/errata/RHSA-2026:3165	vendor-advisoryx_refsource_REDHAT
	https://access.redhat.com/security/cve/CVE-2025-11234	vdb-entryx_refsource_REDHAT
	https://bugzilla.redhat.com/show_bug.cgi?id=2401209	issue-trackingx_refsource_REDHAT

Impacted products

Vendor

Product

Version

Affected: 2.6.0 , < 10.1.2 (semver)

Red Hat	Red Hat Enterprise Linux 10	Unaffected: 18:10.0.0-14.el10_1.5 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.1
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	Unaffected: 17:7.2.0-14.el9_2.24 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.2::appstream
Red Hat	Red Hat Enterprise Linux 9.4 Extended Update Support	Unaffected: 17:8.2.0-11.el9_4.18 , < * (rpm) cpe:/a:redhat:rhel_eus:9.4::appstream
Red Hat	Red Hat Enterprise Linux 9.4 Extended Update Support	Unaffected: 17:8.2.0-11.el9_4.19 , < * (rpm) cpe:/a:redhat:rhel_eus:9.4::appstream
Red Hat	Red Hat OpenShift Container Platform 4.16	Unaffected: 416.94.202601071926-0 , < * (rpm) cpe:/a:redhat:openshift:4.16::el9
Red Hat	Red Hat OpenShift Container Platform 4.17	Unaffected: 417.94.202601120213-0 , < * (rpm) cpe:/a:redhat:openshift:4.17::el9
Red Hat	Red Hat OpenShift Container Platform 4.18	Unaffected: 418.94.202601071817-0 , < * (rpm) cpe:/a:redhat:openshift:4.18::el9
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 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Credits

Red Hat would like to thank Grant Millar (Cylo) for reporting this issue.

Show details on NVD website

JSON

To clipboard

{
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        {
          "name": "RHSA-2026:0702",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:0702"
        },
        {
          "name": "RHSA-2026:1831",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:1831"
        },
        {
          "name": "RHSA-2026:3077",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:3077"
        },
        {
          "name": "RHSA-2026:3165",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:3165"
        },
        {
          "tags": [
            "vdb-entry",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/security/cve/CVE-2025-11234"
        },
        {
          "name": "RHBZ#2401209",
          "tags": [
            "issue-tracking",
            "x_refsource_REDHAT"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2401209"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2025-09-30T00:00:00.000Z",
          "value": "Reported to Red Hat."
        },
        {
          "lang": "en",
          "time": "2025-09-30T12:18:00.000Z",
          "value": "Made public."
        }
      ],
      "title": "Qemu-kvm: vnc websocket handshake use-after-free",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_redhatCweChain": "CWE-416: Use After Free"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2025-11234",
    "datePublished": "2025-10-03T10:30:34.427Z",
    "dateReserved": "2025-10-01T17:03:04.737Z",
    "dateUpdated": "2026-02-24T10:13:46.495Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted