Description
A flaw was found in the X.Org X server and Xwayland when processing X11 Present extension notifications. Improper error handling during notification creation can leave dangling pointers that lead to a use-after-free condition. This can cause memory corruption or a crash, potentially allowing an attacker to execute arbitrary code or cause a denial of service.
References10
- access.redhat.com/errata/RHSA-2025:19432
- access.redhat.com/errata/RHSA-2025:19433
- access.redhat.com/errata/RHSA-2025:19434
- access.redhat.com/errata/RHSA-2025:19435
- access.redhat.com/errata/RHSA-2025:19489
- access.redhat.com/errata/RHSA-2025:19623
- access.redhat.com/errata/RHSA-2025:19909
- access.redhat.com/errata/RHSA-2025:20958
- access.redhat.com/errata/RHSA-2025:20960
- access.redhat.com/errata/RHSA-2025:20961
Metrics
- CVSS 3.1
-
7.3
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H - EPSS — exploit probability
- 1% percentile: 44 · as of 10 November 2026
- CWE
- CWE-416
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.