CVE-2023-6377

Xorg-x11-server: out-of-bounds memory reads/writes in xkb button actions

HIGH
7.8
CVSS Score
Published: December 13, 2023 at 06:27 AM UTC
Updated: June 23, 2026 at 06:17 PM UTC
6 products affected across 4 vendorsDebian LinuxEnterprise Linux EusX server

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Severity
HIGH7.8
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or possible remote code execution in cases where X11 forwarding is involved.

Affected

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

All versions
redhat-enterprise-linux (environment)
v < 21.1.10
Affected range stops below 21.1.10, so it looks safe — our inference, not a vendor statement
redhat-enterprise-linux (environment)
v < 23.2.3
Affected range stops below 23.2.3, so it looks safe — our inference, not a vendor statement
redhat-enterprise-linux (environment)
All versions
Vendor states this is fixed in 0:1.1.0-25.el6_10.14 (unaffected)
Vendor states this is fixed in 0:1.11.0-22.el9_0.5 (unaffected)
Vendor states this is fixed in 0:1.11.0-8.el8_4.5 (unaffected)
Vendor states this is fixed in 0:1.12.0-14.el9_2.2 (unaffected)
Vendor states this is fixed in 0:1.12.0-15.el8_8.4 (unaffected)
Vendor states this is fixed in 0:1.12.0-6.el8_6.6 (unaffected)
Vendor states this is fixed in 0:1.13.1-2.el8_9.4 (unaffected)
Vendor states this is fixed in 0:1.13.1-3.el9_3.3 (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 0:1.20.4-25.el7_9 (unaffected)
Vendor states this is fixed in 0:1.8.0-28.el7_9 (unaffected)
Vendor states this is fixed in 0:1.9.0-15.el8_2.6 (unaffected)
Vendor states this is fixed in 0:21.1.3-15.el8 (unaffected)
Vendor states this is fixed in 0:22.1.9-5.el9 (unaffected)
Vendor states this is fixed in 6 (unknown)

References (29)

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

7.8HIGHredhat
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125CWE-787

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