An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validating the window tree marked just before, which leaves the validated data partly initialized and the use of an uninitialized pointer later.
The product accesses or uses a pointer that has not been initialized.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Tigervnc | Tigervnc | - (including) | - (including) |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | RedHat | tigervnc-0:1.8.0-36.el7_9 | * |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | RedHat | xorg-x11-server-0:1.20.4-30.el7_9 | * |
| Red Hat Enterprise Linux 8 | RedHat | tigervnc-0:1.13.1-15.el8_10 | * |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | RedHat | tigervnc-0:1.9.0-15.el8_2.13 | * |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | RedHat | tigervnc-0:1.11.0-8.el8_4.12 | * |
| Red Hat Enterprise Linux 8.4 Telecommunications Update Service | RedHat | tigervnc-0:1.11.0-8.el8_4.12 | * |
| Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions | RedHat | tigervnc-0:1.11.0-8.el8_4.12 | * |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | RedHat | tigervnc-0:1.12.0-6.el8_6.13 | * |
| Red Hat Enterprise Linux 8.6 Telecommunications Update Service | RedHat | tigervnc-0:1.12.0-6.el8_6.13 | * |
| Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | RedHat | tigervnc-0:1.12.0-6.el8_6.13 | * |
| Red Hat Enterprise Linux 8.8 Extended Update Support | RedHat | tigervnc-0:1.12.0-15.el8_8.12 | * |
| Red Hat Enterprise Linux 9 | RedHat | tigervnc-0:1.14.1-1.el9_5.1 | * |
| Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | RedHat | tigervnc-0:1.11.0-22.el9_0.13 | * |
| Red Hat Enterprise Linux 9.2 Extended Update Support | RedHat | tigervnc-0:1.12.0-14.el9_2.10 | * |
| Red Hat Enterprise Linux 9.4 Extended Update Support | RedHat | tigervnc-0:1.13.1-8.el9_4.5 | * |
| Xorg-server | Ubuntu | devel | * |
| Xorg-server | Ubuntu | esm-infra/bionic | * |
| Xorg-server | Ubuntu | esm-infra/xenial | * |
| Xorg-server | Ubuntu | focal | * |
| Xorg-server | Ubuntu | jammy | * |
| Xorg-server | Ubuntu | noble | * |
| Xorg-server | Ubuntu | oracular | * |
| Xorg-server | Ubuntu | upstream | * |
| Xorg-server-hwe-16.04 | Ubuntu | esm-infra/xenial | * |
| Xorg-server-hwe-18.04 | Ubuntu | esm-infra/bionic | * |
| Xwayland | Ubuntu | devel | * |
| Xwayland | Ubuntu | jammy | * |
| Xwayland | Ubuntu | noble | * |
| Xwayland | Ubuntu | oracular | * |
| Xwayland | Ubuntu | upstream | * |
If the pointer contains an uninitialized value, then the value might not point to a valid memory location. This could cause the product to read from or write to unexpected memory locations, leading to a denial of service. If the uninitialized pointer is used as a function call, then arbitrary functions could be invoked. If an attacker can influence the portion of uninitialized memory that is contained in the pointer, this weakness could be leveraged to execute code or perform other attacks. Depending on memory layout, associated memory management behaviors, and product operation, the attacker might be able to influence the contents of the uninitialized pointer, thus gaining more fine-grained control of the memory location to be accessed.