A flaw was found in the X Rendering extension's handling of animated cursors. If a client provides no cursors, the server assumes at least one is present, leading to an out-of-bounds read and potential crash.
https://access.redhat.com/errata/RHSA-2025:9964
https://access.redhat.com/errata/RHSA-2025:9392
https://access.redhat.com/errata/RHSA-2025:9306
https://access.redhat.com/errata/RHSA-2025:9305
https://access.redhat.com/errata/RHSA-2025:9304
https://access.redhat.com/errata/RHSA-2025:9303
https://access.redhat.com/errata/RHSA-2025:10410
https://access.redhat.com/errata/RHSA-2025:10381
https://access.redhat.com/errata/RHSA-2025:10378
https://access.redhat.com/errata/RHSA-2025:10377
https://access.redhat.com/errata/RHSA-2025:10376
https://access.redhat.com/errata/RHSA-2025:10375
https://access.redhat.com/errata/RHSA-2025:10374
https://access.redhat.com/errata/RHSA-2025:10370
https://access.redhat.com/errata/RHSA-2025:10360
https://access.redhat.com/errata/RHSA-2025:10356
https://access.redhat.com/errata/RHSA-2025:10355
https://access.redhat.com/errata/RHSA-2025:10352
https://access.redhat.com/errata/RHSA-2025:10351
https://access.redhat.com/errata/RHSA-2025:10350
https://access.redhat.com/errata/RHSA-2025:10349
https://access.redhat.com/errata/RHSA-2025:10348
https://access.redhat.com/errata/RHSA-2025:10347
https://access.redhat.com/errata/RHSA-2025:10346
https://access.redhat.com/errata/RHSA-2025:10344
https://access.redhat.com/errata/RHSA-2025:10343
https://www.x.org/wiki/Development/Security/
https://lists.debian.org/debian-lts-announce/2025/06/msg00028.html
https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2024
https://gitlab.freedesktop.org/xorg/xserver/-/commit/0885e0b26225c90534642fe911632ec0779eebee