Bug 2451106 (CVE-2026-33999) - CVE-2026-33999 xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling
Summary: CVE-2026-33999 xorg: xwayland: X.Org X server: Denial of Service via integer ...
Keywords:
Status: NEW
Alias: CVE-2026-33999
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2476954 2476956 2476957
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-25 06:29 UTC by OSIDB Bzimport
Modified: 2026-06-08 02:03 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 RHSA-2026:10739 0 None None None 2026-04-27 08:29:52 UTC
Red Hat Product Errata RHSA-2026:11352 0 None None None 2026-04-28 11:21:02 UTC
Red Hat Product Errata RHSA-2026:11369 0 None None None 2026-04-28 14:53:17 UTC
Red Hat Product Errata RHSA-2026:11388 0 None None None 2026-04-28 17:58:05 UTC
Red Hat Product Errata RHSA-2026:11656 0 None None None 2026-04-29 12:01:23 UTC
Red Hat Product Errata RHSA-2026:11692 0 None None None 2026-04-29 13:07:52 UTC
Red Hat Product Errata RHSA-2026:13414 0 None None None 2026-05-04 12:29:11 UTC
Red Hat Product Errata RHSA-2026:19125 0 None None None 2026-05-19 16:05:08 UTC
Red Hat Product Errata RHSA-2026:19342 0 None None None 2026-05-19 21:36:59 UTC
Red Hat Product Errata RHSA-2026:19343 0 None None None 2026-05-19 21:37:05 UTC
Red Hat Product Errata RHSA-2026:19344 0 None None None 2026-05-19 21:41:46 UTC
Red Hat Product Errata RHSA-2026:20547 0 None None None 2026-05-26 03:03:49 UTC
Red Hat Product Errata RHSA-2026:20555 0 None None None 2026-05-26 04:58:58 UTC
Red Hat Product Errata RHSA-2026:20557 0 None None None 2026-05-26 02:48:48 UTC
Red Hat Product Errata RHSA-2026:20558 0 None None None 2026-05-26 03:50:33 UTC
Red Hat Product Errata RHSA-2026:20560 0 None None None 2026-05-26 03:04:18 UTC
Red Hat Product Errata RHSA-2026:20561 0 None None None 2026-05-26 03:43:21 UTC
Red Hat Product Errata RHSA-2026:20562 0 None None None 2026-05-26 01:57:00 UTC
Red Hat Product Errata RHSA-2026:20563 0 None None None 2026-05-26 03:18:13 UTC
Red Hat Product Errata RHSA-2026:20575 0 None None None 2026-05-26 04:00:38 UTC
Red Hat Product Errata RHSA-2026:20576 0 None None None 2026-05-26 04:55:29 UTC
Red Hat Product Errata RHSA-2026:20590 0 None None None 2026-05-26 04:31:02 UTC
Red Hat Product Errata RHSA-2026:21699 0 None None None 2026-05-28 07:49:12 UTC
Red Hat Product Errata RHSA-2026:21712 0 None None None 2026-05-28 09:33:23 UTC
Red Hat Product Errata RHSA-2026:21715 0 None None None 2026-05-28 09:37:51 UTC
Red Hat Product Errata RHSA-2026:21716 0 None None None 2026-05-28 09:44:06 UTC
Red Hat Product Errata RHSA-2026:21718 0 None None None 2026-05-28 09:55:37 UTC
Red Hat Product Errata RHSA-2026:21741 0 None None None 2026-05-28 11:38:16 UTC
Red Hat Product Errata RHSA-2026:21742 0 None None None 2026-05-28 12:02:33 UTC
Red Hat Product Errata RHSA-2026:22424 0 None None None 2026-06-02 08:16:48 UTC
Red Hat Product Errata RHSA-2026:22456 0 None None None 2026-06-02 16:05:13 UTC
Red Hat Product Errata RHSA-2026:23254 0 None None None 2026-06-04 11:12:52 UTC
Red Hat Product Errata RHSA-2026:23255 0 None None None 2026-06-04 11:24:26 UTC
Red Hat Product Errata RHSA-2026:23496 0 None None None 2026-06-04 22:07:44 UTC
Red Hat Product Errata RHSA-2026:24341 0 None None None 2026-06-08 02:03:51 UTC

Description OSIDB Bzimport 2026-03-25 06:29:42 UTC 
Integer Underflow (Wraparound) vulnerability in the XKB compatibility map handling of the X.Org X server. The issue occurs in XkbSetCompatMap() when a previously truncated “compat” buffer leaves unused space that is later reused without correctly updating the count of valid entries. This can cause internal size/index calculations to become inconsistent and potentially underflow, resulting in a buffer read overrun when subsequent XKB requests are processed. An attacker with access to the X11 server (local or via remote X11 forwarding/SSH tunneling) can trigger the flaw without user interaction, leading to memory-safety violations and potentially a crash or more severe impact depending on how Xorg/Xwayland is deployed.
Comment 4 errata-xmlrpc 2026-04-27 08:29:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:10739 https://access.redhat.com/errata/RHSA-2026:10739
Comment 5 errata-xmlrpc 2026-04-28 11:20:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:11352 https://access.redhat.com/errata/RHSA-2026:11352
Comment 6 errata-xmlrpc 2026-04-28 14:53:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:11369 https://access.redhat.com/errata/RHSA-2026:11369
Comment 7 errata-xmlrpc 2026-04-28 17:58:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:11388 https://access.redhat.com/errata/RHSA-2026:11388
Comment 8 errata-xmlrpc 2026-04-29 12:01:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:11656 https://access.redhat.com/errata/RHSA-2026:11656
Comment 9 errata-xmlrpc 2026-04-29 13:07:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:11692 https://access.redhat.com/errata/RHSA-2026:11692
Comment 10 errata-xmlrpc 2026-05-04 12:29:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:13414 https://access.redhat.com/errata/RHSA-2026:13414
Comment 11 errata-xmlrpc 2026-05-19 16:05:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19125 https://access.redhat.com/errata/RHSA-2026:19125
Comment 12 errata-xmlrpc 2026-05-19 21:36:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19342 https://access.redhat.com/errata/RHSA-2026:19342
Comment 13 errata-xmlrpc 2026-05-19 21:37:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19343 https://access.redhat.com/errata/RHSA-2026:19343
Comment 14 errata-xmlrpc 2026-05-19 21:41:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19344 https://access.redhat.com/errata/RHSA-2026:19344
Comment 15 errata-xmlrpc 2026-05-26 01:56:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:20562 https://access.redhat.com/errata/RHSA-2026:20562
Comment 16 errata-xmlrpc 2026-05-26 02:48:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:20557 https://access.redhat.com/errata/RHSA-2026:20557
Comment 17 errata-xmlrpc 2026-05-26 03:03:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:20547 https://access.redhat.com/errata/RHSA-2026:20547
Comment 18 errata-xmlrpc 2026-05-26 03:04:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:20560 https://access.redhat.com/errata/RHSA-2026:20560
Comment 19 errata-xmlrpc 2026-05-26 03:18:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:20563 https://access.redhat.com/errata/RHSA-2026:20563
Comment 20 errata-xmlrpc 2026-05-26 03:43:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:20561 https://access.redhat.com/errata/RHSA-2026:20561
Comment 21 errata-xmlrpc 2026-05-26 03:50:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:20558 https://access.redhat.com/errata/RHSA-2026:20558
Comment 22 errata-xmlrpc 2026-05-26 04:00:37 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:20575 https://access.redhat.com/errata/RHSA-2026:20575
Comment 23 errata-xmlrpc 2026-05-26 04:31:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:20590 https://access.redhat.com/errata/RHSA-2026:20590
Comment 24 errata-xmlrpc 2026-05-26 04:55:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:20576 https://access.redhat.com/errata/RHSA-2026:20576
Comment 25 errata-xmlrpc 2026-05-26 04:58:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:20555 https://access.redhat.com/errata/RHSA-2026:20555
Comment 26 errata-xmlrpc 2026-05-28 07:49:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:21699 https://access.redhat.com/errata/RHSA-2026:21699
Comment 27 errata-xmlrpc 2026-05-28 09:33:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:21712 https://access.redhat.com/errata/RHSA-2026:21712
Comment 28 errata-xmlrpc 2026-05-28 09:37:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:21715 https://access.redhat.com/errata/RHSA-2026:21715
Comment 29 errata-xmlrpc 2026-05-28 09:44:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:21716 https://access.redhat.com/errata/RHSA-2026:21716
Comment 30 errata-xmlrpc 2026-05-28 09:55:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:21718 https://access.redhat.com/errata/RHSA-2026:21718
Comment 31 errata-xmlrpc 2026-05-28 11:38:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:21741 https://access.redhat.com/errata/RHSA-2026:21741
Comment 32 errata-xmlrpc 2026-05-28 12:02:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:21742 https://access.redhat.com/errata/RHSA-2026:21742
Comment 33 errata-xmlrpc 2026-06-02 08:16:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:22424 https://access.redhat.com/errata/RHSA-2026:22424
Comment 34 errata-xmlrpc 2026-06-02 16:05:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:22456 https://access.redhat.com/errata/RHSA-2026:22456
Comment 35 errata-xmlrpc 2026-06-04 11:12:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:23254 https://access.redhat.com/errata/RHSA-2026:23254
Comment 36 errata-xmlrpc 2026-06-04 11:24:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:23255 https://access.redhat.com/errata/RHSA-2026:23255
Comment 37 errata-xmlrpc 2026-06-04 22:07:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6 Extended Lifecycle Support  - EXTENSION

Via RHSA-2026:23496 https://access.redhat.com/errata/RHSA-2026:23496
Comment 38 errata-xmlrpc 2026-06-08 02:03:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:24341 https://access.redhat.com/errata/RHSA-2026:24341
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