Libx11: out-of-bounds memory access in _xkbreadkeysyms()

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Summary

CVECVE-2023-43785
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-10-10 13:15:21 UTC
Updated2026-11-07 12:17:35 UTC
DescriptionA vulnerability was found in libX11 due to a boundary condition within the _XkbReadKeySyms() function. This flaw allows a local user to trigger an out-of-bounds read error and read the contents of memory on the system.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.006690000 probability, percentile 0.522220000 (date 2026-11-08)

Problem Types: CWE-787 | CWE-125 | CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 38 All All All
Operating System Redhat Enterprise Linux 8.0 All All All
Operating System Redhat Enterprise Linux 9.0 All All All
Application X.org Libx11 All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:1.6.8-8.el8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:1.7.0-9.el9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified

References

ReferenceSourceLinkTags
cve-details af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2024:2145 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
lists.debian.org/debian-lts-announce/2023/10/msg00004.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
October 2023 libX11 Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com
2242252 – (CVE-2023-43785) CVE-2023-43785 libX11: out-of-bounds memory access in _XkbReadKeySyms() af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Third Party Advisory
access.redhat.com/errata/RHSA-2024:2973 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2023-10-05T00:00:00.000ZReported to Red Hat.
CNA2023-10-04T00:00:00.000ZMade public.

Legacy QID Mappings

  • 199800 Ubuntu Security Notification for libx11 Vulnerabilities (USN-6407-1)
  • 199821 Ubuntu Security Notification for libx11 Vulnerabilities (USN-6407-2)
  • 285225 Fedora Security Update for libX11 (FEDORA-2023-06bff5611a)
  • 296108 Oracle Solaris 11.4 Support Repository Update (SRU) 66.164.1 Missing (CPUJAN2024)
  • 356439 Amazon Linux Security Advisory for libX11 : ALAS2-2023-2296
  • 356449 Amazon Linux Security Advisory for libX11 : ALAS-2023-1859
  • 356542 Amazon Linux Security Advisory for libX11 : ALAS2023-2023-383
  • 356979 Amazon Linux Security Advisory for libX11 : AL2012-2023-463
  • 503467 Alpine Linux Security Update for libx11
  • 505891 Alpine Linux Security Update for libx11
  • 6000133 Debian Security Update for libx11 (DLA 3602-1)
  • 6000211 Debian Security Update for libx11 (DSA 5517-1)
  • 673510 EulerOS Security Update for libx11 (EulerOS-SA-2023-3249)
  • 673653 EulerOS Security Update for libx11 (EulerOS-SA-2024-1150)
  • 673658 EulerOS Security Update for libx11 (EulerOS-SA-2024-1281)
  • 673682 EulerOS Security Update for libx11 (EulerOS-SA-2024-1089)
  • 673699 EulerOS Security Update for libx11 (EulerOS-SA-2023-3310)
  • 673940 EulerOS Security Update for libx11 (EulerOS-SA-2023-3277)
  • 674022 EulerOS Security Update for libx11 (EulerOS-SA-2023-3342)
  • 674040 EulerOS Security Update for libx11 (EulerOS-SA-2024-1065)
  • 691325 Free Berkeley Software Distribution (FreeBSD) Security Update for 11/libx11 Multiple Vulnerabilities (bd92f1ab-690c-11ee-9ed0-001fc69cd6dc)
  • 755028 SUSE Enterprise Linux Security Update for libX11 (SUSE-SU-2023:3963-1)
  • 755044 SUSE Enterprise Linux Security Update for libX11 (SUSE-SU-2023:3989-1)
  • 907540 Common Base Linux Mariner (CBL-Mariner) Security Update for libX11 (31320-1)

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