Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2023-1393

Use After Free

Published: Mar 30, 2023 | Modified: Aug 29, 2025
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
7.8 IMPORTANT
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2023-1393
CWEhttps://cwe.mitre.org/data/definitions/416.html

A flaw was found in X.Org Server Overlay Window. A Use-After-Free may lead to local privilege escalation. If a client explicitly destroys the compositor overlay window (aka COW), the Xserver would leave a dangling pointer to that window in the CompScreen structure, which will trigger a use-after-free later.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

NameVendorStart VersionEnd Version
X_serverX.org*21.1.8 (excluding)
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONRedHattigervnc-0:1.1.0-25.el6_10.13*
Red Hat Enterprise Linux 7RedHattigervnc-0:1.8.0-25.el7_9*
Red Hat Enterprise Linux 7RedHatxorg-x11-server-0:1.20.4-23.el7_9*
Red Hat Enterprise Linux 8RedHattigervnc-0:1.12.0-9.el8_7.3*
Red Hat Enterprise Linux 8RedHatxorg-x11-server-0:1.20.11-17.el8*
Red Hat Enterprise Linux 8RedHatxorg-x11-server-Xwayland-0:21.1.3-12.el8*
Red Hat Enterprise Linux 8.1 Update Services for SAP SolutionsRedHattigervnc-0:1.9.0-16.el8_1.3*
Red Hat Enterprise Linux 8.2 Advanced Update SupportRedHattigervnc-0:1.9.0-15.el8_2.3*
Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceRedHattigervnc-0:1.9.0-15.el8_2.3*
Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsRedHattigervnc-0:1.9.0-15.el8_2.3*
Red Hat Enterprise Linux 8.4 Extended Update SupportRedHattigervnc-0:1.11.0-8.el8_4.2*
Red Hat Enterprise Linux 8.6 Extended Update SupportRedHattigervnc-0:1.12.0-6.el8_6.3*
Red Hat Enterprise Linux 9RedHattigervnc-0:1.12.0-5.el9_1.2*
Red Hat Enterprise Linux 9RedHatxorg-x11-server-0:1.20.11-19.el9*
Red Hat Enterprise Linux 9RedHatxorg-x11-server-Xwayland-0:22.1.9-2.el9*
Red Hat Enterprise Linux 9.0 Extended Update SupportRedHattigervnc-0:1.11.0-22.el9_0.2*
TigervncUbuntubionic*
TigervncUbuntuesm-apps/focal*
TigervncUbuntuesm-apps/jammy*
TigervncUbuntufocal*
TigervncUbuntujammy*
TigervncUbuntulunar*
TigervncUbuntumantic*
TigervncUbuntutrusty*
TigervncUbuntuxenial*
Xorg-serverUbuntubionic*
Xorg-serverUbuntudevel*
Xorg-serverUbuntuesm-infra/bionic*
Xorg-serverUbuntuesm-infra/focal*
Xorg-serverUbuntufocal*
Xorg-serverUbuntujammy*
Xorg-serverUbuntukinetic*
Xorg-serverUbuntulunar*
Xorg-serverUbuntumantic*
Xorg-serverUbuntunoble*
Xorg-serverUbuntuoracular*
Xorg-serverUbuntuplucky*
Xorg-serverUbuntuquesting*
Xorg-serverUbuntutrusty*
Xorg-serverUbuntutrusty/esm*
Xorg-serverUbuntuupstream*
Xorg-serverUbuntuxenial*
Xorg-server-hwe-16.04Ubuntuxenial*
Xorg-server-hwe-18.04Ubuntubionic*
Xorg-server-hwe-18.04Ubuntuesm-infra/bionic*
Xorg-server-lts-utopicUbuntutrusty*
Xorg-server-lts-vividUbuntutrusty*
Xorg-server-lts-wilyUbuntutrusty*
Xorg-server-lts-xenialUbuntutrusty*
XwaylandUbuntudevel*
XwaylandUbuntujammy*
XwaylandUbuntukinetic*
XwaylandUbuntulunar*
XwaylandUbuntumantic*
XwaylandUbuntunoble*
XwaylandUbuntuoracular*
XwaylandUbuntuplucky*
XwaylandUbuntuquesting*

Potential Mitigations

References

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