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TI-2026-82017 Aliases CVE-2026-93524GHSA-3qj2-mfg9-42jq

Buffer overread in X.Org X Server XKB keymap handling

Priority LOW 30CWE-126Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · None · High
Fix status
Partial Red Hat: 5 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

X.Org X Server before 21.1.25 and XWayland before 24.1.14 contain a buffer overread in CheckKeySyms() (CWE-126). An authenticated X client can use it to leak small amounts of X server memory or crash the X server.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

A buffer overread in CheckKeySyms() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to leak small amounts of information from X server memory or potentially crash the X server.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00177 7th percentileScored 2026-11-07
Fix Partial xorg-x11-server (x.org): 21.1.25xwayland (x.org): 24.1.14Red Hat: 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
x.orgxorg-x11-serverbefore 21.1.2521.1.25Patch availableCNA
x.orgxwaylandbefore 24.1.1424.1.14Patch availableCNA
  • xorg-x11-server Vendorx.org Affected before 21.1.25 Fixed in 21.1.25 Patch available CNA
  • xwayland Vendorx.org Affected before 24.1.14 Fixed in 24.1.14 Patch available CNA

Remediation

Update xorg-x11-server to 21.1.25 and xwayland to 24.1.14. Red Hat Enterprise Linux 10, 9, 8 and 7 have no fix available, and Red Hat Enterprise Linux 6 has no fix planned.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA xorg-x11-server (x.org) Fixed in 21.1.25
  • Fix · CNA xwayland (x.org) Fixed in 24.1.14

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    x.org xorg-x11-server 21.1.25

    10 records Highest priority Priority LOW 10 LOW

    Other records, highest priority first

    • TI-2026-82016 Heap buffer overflow in X.Org X Server XInput2 request handlingPriority LOW 35
    • TI-2026-82013 X.Org Server Glamor CopyArea Heap Buffer OverflowPriority LOW 35
    • TI-2026-82007 Heap buffer overflow in X.Org X server XKB keycode range handlingPriority LOW 35
    Show all 10 records →
  • Release ·

    x.org xwayland 24.1.14

    10 records Highest priority Priority LOW 10 LOW

    Other records, highest priority first

    • TI-2026-81987 Heap buffer overflow in X.Org Server GLX RenderLarge requestPriority LOW 38
    • TI-2026-82016 Heap buffer overflow in X.Org X Server XInput2 request handlingPriority LOW 35
    • TI-2026-82013 X.Org Server Glamor CopyArea Heap Buffer OverflowPriority LOW 35
    Show all 10 records →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-93524
  2. 2026-10-28 Alias added: GHSA-3qj2-mfg9-42jq
  3. 2026-10-30 Priority changed: MEDIUM → LOW
  4. 2026-11-06 CISA SSVC decision points changed

References

Patch 1

  • TI-2022-25238 In X.Org X server 20.11 through 21.1.16, when a client application uses easystroke for… CVSS 3.1HIGH 7.7
  • TI-1999-00519 An X server's access control is disabled (e.g. CVSS 2.0HIGH 10.0
  • TI-2021-11657 LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote… CVSS 3.1CRITICAL 9.8
  • TI-2018-10465 An issue was discovered in libX11 through 1.6.5. CVSS 3.0CRITICAL 9.8
  • TI-2004-00826 Multiple vulnerabilities in libXpm for 6.8.1 and earlier, as used in XFree86 and other… CVSS 2.0HIGH 10.0
  • TI-2016-08240 Multiple integer overflows in libXpm before 3.5.12, when a program requests parsing XPM… CVSS 3.0CRITICAL 9.8
See all 206 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences