A flaw was found in X.Org Server Overlay Window. A Use-After-Free may lead to local privilege escalation. If a client explicitly destroys the compositor overlay window (aka COW), the Xserver would leave a dangling pointer to that window in the CompScreen structure, which will trigger a use-after-free later.
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 Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.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 | * | 21.1.8 (excluding) |
| Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | RedHat | tigervnc-0:1.1.0-25.el6_10.13 | * |
| Red Hat Enterprise Linux 7 | RedHat | tigervnc-0:1.8.0-25.el7_9 | * |
| Red Hat Enterprise Linux 7 | RedHat | xorg-x11-server-0:1.20.4-23.el7_9 | * |
| Red Hat Enterprise Linux 8 | RedHat | tigervnc-0:1.12.0-9.el8_7.3 | * |
| Red Hat Enterprise Linux 8 | RedHat | xorg-x11-server-0:1.20.11-17.el8 | * |
| Red Hat Enterprise Linux 8 | RedHat | xorg-x11-server-Xwayland-0:21.1.3-12.el8 | * |
| Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions | RedHat | tigervnc-0:1.9.0-16.el8_1.3 | * |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | RedHat | tigervnc-0:1.9.0-15.el8_2.3 | * |
| Red Hat Enterprise Linux 8.2 Telecommunications Update Service | RedHat | tigervnc-0:1.9.0-15.el8_2.3 | * |
| Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions | RedHat | tigervnc-0:1.9.0-15.el8_2.3 | * |
| Red Hat Enterprise Linux 8.4 Extended Update Support | RedHat | tigervnc-0:1.11.0-8.el8_4.2 | * |
| Red Hat Enterprise Linux 8.6 Extended Update Support | RedHat | tigervnc-0:1.12.0-6.el8_6.3 | * |
| Red Hat Enterprise Linux 9 | RedHat | tigervnc-0:1.12.0-5.el9_1.2 | * |
| Red Hat Enterprise Linux 9 | RedHat | xorg-x11-server-0:1.20.11-19.el9 | * |
| Red Hat Enterprise Linux 9 | RedHat | xorg-x11-server-Xwayland-0:22.1.9-2.el9 | * |
| Red Hat Enterprise Linux 9.0 Extended Update Support | RedHat | tigervnc-0:1.11.0-22.el9_0.2 | * |
| Tigervnc | Ubuntu | bionic | * |
| Tigervnc | Ubuntu | esm-apps/focal | * |
| Tigervnc | Ubuntu | esm-apps/jammy | * |
| Tigervnc | Ubuntu | focal | * |
| Tigervnc | Ubuntu | jammy | * |
| Tigervnc | Ubuntu | lunar | * |
| Tigervnc | Ubuntu | mantic | * |
| Tigervnc | Ubuntu | trusty | * |
| Tigervnc | Ubuntu | xenial | * |
| Xorg-server | Ubuntu | bionic | * |
| Xorg-server | Ubuntu | devel | * |
| Xorg-server | Ubuntu | esm-infra/bionic | * |
| Xorg-server | Ubuntu | esm-infra/focal | * |
| Xorg-server | Ubuntu | focal | * |
| Xorg-server | Ubuntu | jammy | * |
| Xorg-server | Ubuntu | kinetic | * |
| 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-hwe-18.04 | Ubuntu | esm-infra/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 | * |
| Xwayland | Ubuntu | devel | * |
| Xwayland | Ubuntu | jammy | * |
| Xwayland | Ubuntu | kinetic | * |
| Xwayland | Ubuntu | lunar | * |
| Xwayland | Ubuntu | mantic | * |
| Xwayland | Ubuntu | noble | * |
| Xwayland | Ubuntu | oracular | * |
| Xwayland | Ubuntu | plucky | * |