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High 7.8Published Apr 23, 2026

CVE-2026-34001Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption

Updated under an hour ago ()

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It affects Red Hat Enterprise Linux 10 and 7 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS
7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-825
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
redhat
NVD analysis
Awaiting Analysis
Record last updated
Jul 14, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
from 0:24.1.5-6.el10_1 not affected
CNA record
from 0:24.1.5-6.el10_0 not affected
CNA record
from 0:1.1.0-25.el6_10.16 not affected
CNA record
from 0:1.20.10-4.el8_4 not affected
CNA record
from 0:1.20.10-4.el8_4 not affected
CNA record
from 0:21.1.3-2.el8_6.6 not affected
CNA record
from 0:21.1.3-2.el8_6.6 not affected
CNA record
from 0:1.20.11-28.el9_4 not affected
CNA record
from 0:24.1.5-6.el10_1 not affected; from 0:24.1.9-4.el10_2 not affected
CISA ADP
from 0:24.1.5-6.el10_0 not affected
CISA ADP

References

References

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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