A use-after-free flaw was found in the xorg-x11-server. An X server crash may occur in a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode) if the pointer is warped from within a window on one screen to the root window of the other screen and if the original window is destroyed followed by another window being destroyed.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| X_server | X.org | * | 21.1.9 (excluding) |
| Xwayland | X.org | * | 23.2.2 (excluding) |
| Red Hat Enterprise Linux 7 | RedHat | tigervnc-0:1.8.0-26.el7_9 | * |
| Red Hat Enterprise Linux 8 | RedHat | xorg-x11-server-0:1.20.11-22.el8 | * |
| Red Hat Enterprise Linux 8 | RedHat | tigervnc-0:1.13.1-8.el8 | * |
| Red Hat Enterprise Linux 9 | RedHat | xorg-x11-server-0:1.20.11-24.el9 | * |
| Red Hat Enterprise Linux 9 | RedHat | tigervnc-0:1.13.1-8.el9 | * |
| Xorg | Ubuntu | bionic | * |
| Xorg | Ubuntu | trusty | * |
| Xorg | Ubuntu | xenial | * |
| Xorg-server | Ubuntu | bionic | * |
| Xorg-server | Ubuntu | devel | * |
| Xorg-server | Ubuntu | esm-infra-legacy/trusty | * |
| Xorg-server | Ubuntu | esm-infra/bionic | * |
| Xorg-server | Ubuntu | esm-infra/focal | * |
| Xorg-server | Ubuntu | esm-infra/xenial | * |
| Xorg-server | Ubuntu | focal | * |
| Xorg-server | Ubuntu | jammy | * |
| Xorg-server | Ubuntu | lunar | * |
| Xorg-server | Ubuntu | mantic | * |
| Xorg-server | Ubuntu | noble | * |
| Xorg-server | Ubuntu | oracular | * |
| Xorg-server | Ubuntu | plucky | * |
| Xorg-server | Ubuntu | trusty | * |
| Xorg-server | Ubuntu | trusty/esm | * |
| Xorg-server | Ubuntu | upstream | * |
| Xorg-server | Ubuntu | xenial | * |
| Xorg-server-hwe-16.04 | Ubuntu | xenial | * |
| Xorg-server-hwe-18.04 | Ubuntu | bionic | * |
| Xorg-server-lts-utopic | Ubuntu | trusty | * |
| Xorg-server-lts-vivid | Ubuntu | trusty | * |
| Xorg-server-lts-wily | Ubuntu | trusty | * |
| Xorg-server-lts-xenial | Ubuntu | trusty | * |