{"id":"CVE-2026-34001","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-34001","generatedAt":"2026-10-28T08:28:03.668Z","title":"This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function.","description":"A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially enabling memory corruption. This could result in a denial of service or further compromise of the system.","published":"2026-04-23T16:16:25.000Z","lastModified":"2026-10-26T21:10:00.000Z","status":"Awaiting Analysis","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-825"],"affected":[],"epss":{"score":0.00264,"percentile":0.18217,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:10739","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:11352","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:11369","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:11388","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:11656","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:11692","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:13414","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:19125","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:19342","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:19343","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:19344","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20547","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20555","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20557","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20558","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20560","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20561","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20562","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20563","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20575","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20576","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:20590","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:21699","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:21712","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:21715","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:21716","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:21718","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:21741","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:21742","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:22424","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:22456","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:23254","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:23255","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:23496","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:24341","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-34001","source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451109","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:10739","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:11352","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:11369","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:11388","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:11656","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:11692","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:13414","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19125","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19342","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19343","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19344","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:20547","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:20555","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:20557","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:20558","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://acc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BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}