Vulnerabilities
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CVE Vulnerabilities

CVE-2023-5380

Use After Free

Published: Oct 25, 2023 | Modified: Nov 04, 2025
CVSS 3.x
4.7
MEDIUM
Source:
NVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
4.7 MODERATE
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2023-5380
CWEhttps://cwe.mitre.org/data/definitions/416.html

A use-after-free flaw was found in the xorg-x11-server. An X server crash may occur in a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode) if the pointer is warped from within a window on one screen to the root window of the other screen and if the original window is destroyed followed by another window being destroyed.

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 Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.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*21.1.9 (excluding)
XwaylandX.org*23.2.2 (excluding)
Red Hat Enterprise Linux 7RedHattigervnc-0:1.8.0-26.el7_9*
Red Hat Enterprise Linux 8RedHatxorg-x11-server-0:1.20.11-22.el8*
Red Hat Enterprise Linux 8RedHattigervnc-0:1.13.1-8.el8*
Red Hat Enterprise Linux 9RedHatxorg-x11-server-0:1.20.11-24.el9*
Red Hat Enterprise Linux 9RedHattigervnc-0:1.13.1-8.el9*
XorgUbuntubionic*
XorgUbuntutrusty*
XorgUbuntuxenial*
Xorg-serverUbuntubionic*
Xorg-serverUbuntudevel*
Xorg-serverUbuntuesm-infra-legacy/trusty*
Xorg-serverUbuntuesm-infra/bionic*
Xorg-serverUbuntuesm-infra/focal*
Xorg-serverUbuntuesm-infra/xenial*
Xorg-serverUbuntufocal*
Xorg-serverUbuntujammy*
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-lts-utopicUbuntutrusty*
Xorg-server-lts-vividUbuntutrusty*
Xorg-server-lts-wilyUbuntutrusty*
Xorg-server-lts-xenialUbuntutrusty*

Potential Mitigations

References

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