Read the docs
TI-2026-81490 Aliases CVE-2026-88812GHSA-prmg-8fm6-8p8h

Double free in X.Org X Server XKB SetGeometry allows crashes

Priority LOW 35CWE-415Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 6 fixed, 4 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-415 and the CVSS impact.

Summary

The X.org xorg-x11-server before 21.1.25 and xwayland before 24.1.14 contain a double free (CWE-415) in the XKB SetGeometry handling of text doodads. A local user with low privileges who is attached as a client can crash the X server or potentially execute code in its context.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

A double free in XKB SetGeometryin X.Org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by attached clients to cause a crash or potentially code in the x server context.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00187 8th percentileScored 2026-11-07
Fix Partial xorg-x11-server (X.org): 21.1.25xwayland (x.org): 24.1.14Red Hat: 5 advisoriesRed Hat: 6 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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 advisories RHSA-2026:89747, RHSA-2026:86907, RHSA-2026:85193, RHSA-2026:85191 and RHSA-2026:82015 fix it. Red Hat Enterprise Linux 6 has no fix planned, and Red Hat Enterprise Linux 7, 8 and 9 have no fix available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

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

Red Hat 5 advisories

  • RHSA-2026:89747 Released 2026-10-26 · Red Hat rating Important
    xorg-x11-server security update
    • Red Hat Enterprise Linux AppStream (v. 8) xorg-x11-server-1.20.11-28.el8_10.5, xorg-x11-server-Xdmx-1.20.11-28.el8_10.5, xorg-x11-server-Xephyr-1.20.11-28.el8_10.5 +4
    • Red Hat Enterprise Linux CRB (v. 8) xorg-x11-server-devel-1.20.11-28.el8_10.5, xorg-x11-server-source-1.20.11-28.el8_10.5
  • RHSA-2026:86907 Released 2026-10-21 · Red Hat rating Important
    xorg-x11-server-Xwayland security update
    • Red Hat Enterprise Linux AppStream (v. 8) xorg-x11-server-Xwayland-21.1.3-20.el8_10.4
  • RHSA-2026:85193 Released 2026-10-19 · Red Hat rating Important
    xorg-x11-server-Xwayland security update
    • Red Hat Enterprise Linux AppStream (v. 9) xorg-x11-server-Xwayland-24.1.9-4.el9_8.4
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) xorg-x11-server-Xwayland-24.1.9-4.el9_8.4, xorg-x11-server-Xwayland-devel-24.1.9-4.el9_8.4
Show 2 more Red Hat advisories
  • RHSA-2026:85191 Released 2026-10-19 · Red Hat rating Important
    xorg-x11-server-Xwayland security update
    • Red Hat Enterprise Linux AppStream (v. 10) xorg-x11-server-Xwayland-24.1.9-4.el10_2.4
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) xorg-x11-server-Xwayland-devel-24.1.9-4.el10_2.4
  • RHSA-2026:82015 Released 2026-10-13 · Red Hat rating Important
    xorg-x11-server security update
    • Red Hat Enterprise Linux AppStream (v. 9) xorg-x11-server-1.20.11-34.el9_8.4, xorg-x11-server-Xdmx-1.20.11-34.el9_8.4, xorg-x11-server-Xephyr-1.20.11-34.el9_8.4 +4
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) xorg-x11-server-devel-1.20.11-34.el9_8.4, xorg-x11-server-source-1.20.11-34.el9_8.4

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:85191
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:86907, RHSA-2026:89747
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:82015, RHSA-2026:85193
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:89747
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:85191
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:82015, RHSA-2026:85193

Timeline

  1. 2026-10-27 Threatist record created from CVE-2026-88812
  2. 2026-10-27 Alias added: GHSA-prmg-8fm6-8p8h
  3. 2026-10-28 Priority changed: MEDIUM → LOW
  4. 2026-11-04 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