CVE-2023-5380

Xorg-x11-server: use-after-free bug in destroywindow

MEDIUM
4.7
CVSS Score
Published: October 25, 2023 at 07:46 PM UTC
Updated: June 23, 2026 at 07:34 PM UTC
5 products affected across 4 vendorsDebian LinuxFedoraEnterprise Linux

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Severity
MEDIUM4.7
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vendor states this is fixed in 0:1.13.1-8.el8 (unaffected)
Vendor states this is fixed in 0:1.13.1-8.el9 (unaffected)
Vendor states this is fixed in 0:1.20.11-22.el8 (unaffected)
Vendor states this is fixed in 0:1.20.11-24.el9 (unaffected)
Vendor states this is fixed in 0:1.8.0-26.el7_9 (unaffected)
Vendor states this is fixed in 8 (unaffected)
Vendor states this is fixed in 6 (unknown)
v < 21.1.9
Affected range stops below 21.1.9, so it looks safe — our inference, not a vendor statement
v < 23.2.2
Affected range stops below 23.2.2, so it looks safe — our inference, not a vendor statement

References (18)

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.7MEDIUMredhat
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-416

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