Bug 2538514 (CVE-2026-88806) - CVE-2026-88806 libX11: libX11: Heap-based buffer overflow via malicious X server
Summary: CVE-2026-88806 libX11: libX11: Heap-based buffer overflow via malicious X server
Keywords:
Status: NEW
Alias: CVE-2026-88806
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2539102
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-22 18:55 UTC by OSIDB Bzimport
Modified: 2026-11-06 06:44 UTC (History)
3 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2026:90786 0 None None None 2026-10-27 08:30:12 UTC
Red Hat Product Errata RHBA-2026:93528 0 None None None 2026-11-02 04:07:28 UTC
Red Hat Product Errata RHSA-2026:89730 0 None None None 2026-10-26 01:37:13 UTC
Red Hat Product Errata RHSA-2026:91365 0 None None None 2026-10-29 21:13:43 UTC
Red Hat Product Errata RHSA-2026:91366 0 None None None 2026-10-27 22:52:39 UTC
Red Hat Product Errata RHSA-2026:95496 0 None None None 2026-11-05 10:42:56 UTC
Red Hat Product Errata RHSA-2026:95497 0 None None None 2026-11-05 10:56:57 UTC
Red Hat Product Errata RHSA-2026:95498 0 None None None 2026-11-05 11:07:49 UTC
Red Hat Product Errata RHSA-2026:95499 0 None None None 2026-11-05 10:33:25 UTC

Description OSIDB Bzimport 2026-09-22 18:55:17 UTC 
A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.
Comment 2 Jon Orris 2026-10-26 01:37:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:89730 https://access.redhat.com/errata/RHSA-2026:89730
Comment 3 Jon Orris 2026-10-27 22:52:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:91366 https://access.redhat.com/errata/RHSA-2026:91366
Comment 4 Jon Orris 2026-10-29 21:13:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:91365 https://access.redhat.com/errata/RHSA-2026:91365
Comment 5 Jon Orris 2026-11-05 10:33:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:95499 https://access.redhat.com/errata/RHSA-2026:95499
Comment 6 Jon Orris 2026-11-05 10:42:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:95496 https://access.redhat.com/errata/RHSA-2026:95496
Comment 7 Jon Orris 2026-11-05 10:56:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:95497 https://access.redhat.com/errata/RHSA-2026:95497
Comment 8 Jon Orris 2026-11-05 11:07:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:95498 https://access.redhat.com/errata/RHSA-2026:95498
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