{"id":"CVE-2025-11234","title":"A flaw was found in QEMU","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.…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-416"],"vendor":"Red Hat","product":"qemu","affected":["qemu >= 2.6.0 < 10.1.2","qemu-kvm (all versions)","virt-devel:rhel (all versions)","virt:rhel (all versions)","virt:rhel (all versions)","virt:rhel (all versions)","virt:rhel (all versions)","virt:rhel (all versions)","qemu-kvm (all versions)","qemu-kvm (all versions)","qemu-kvm (all versions)","qemu-kvm (all versions)","qemu-kvm (all versions)","rhcos (all versions)","rhcos (all versions)","rhcos (all versions)","rhcos (all versions)","qemu-kvm","qemu-kvm","qemu-kvm-ma (all versions)","openshift/ose-rhel-coreos-9 (all versions)"],"patched":["openshift_container_platform 4.12","openshift_container_platform 4.16","openshift_container_platform 4.17","openshift_container_platform 4.18","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_8","enterprise_linux_appstream_e4s_v_8_8","enterprise_linux_appstream_tus_v_8_8","enterprise_linux_appstream_e4s_v_9_0","enterprise_linux_appstream_e4s_v_9_2","enterprise_linux_appstream_eus_v_9_4","enterprise_linux_appstream_v_9","enterprise_linux_crb_v_8"],"published":"2025-10-03","updated":"2026-09-21","sourceUpdated":"2026-09-21T06:16:59.757","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-11234","references":[{"url":"https://access.redhat.com/errata/RHSA-2025:23228","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:0326","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:0332","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:0702","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:1831","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:18772","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:22147","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:3077","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:3165","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:5578","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:59831","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:68513","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:69131","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2025-11234","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2401209","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-11234.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-11234"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-11234"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2025-10-03T15:56:54.379790Z"},"epss":0.00864,"epssPercentile":0.57085,"ingestedAt":"2026-08-21T13:17:18.038Z","slug":"CVE-2025-11234","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:59831** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.12 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:59831)\n- **RHSA-2026:0326** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.16 · released 2026-01-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:0326)\n- **RHSA-2026:0702** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.17 · released 2026-01-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:0702)\n- **RHSA-2026:0332** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.18 · released 2026-01-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:0332)\n- **RHSA-2026:1831** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-02-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:1831)\n- **RHSA-2026:5578** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-03-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:5578)\n- **RHSA-2026:68513** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68513)\n- **RHSA-2026:22147** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.0) · released 2026-06-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:22147)\n- **RHSA-2026:3077** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-02-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:3077)\n- **RHSA-2025:23228** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.4) · released 2025-12-17 · [advisory](https://access.redhat.com/errata/RHSA-2025:23228)\n- **RHSA-2026:3165** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.4) · released 2026-02-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:3165)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-11234.json)\n- **RHSA-2026:69131** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69131)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}